Room‐Temperature Continuous Wave Lasing of Circular Defect in 2D Photonic Crystal (CirD) Laser with AlO_x Cladding Layers Fabricated by One‐Step Dry Etching

Rubing Zuo, Ryosei Kinoshita, Hanqiao Ye, Hirotake Kajii, Akihiro Maruta, Masahiko Kondow

physica status solidi (a)　2024/01/22　Research paper (scientific journal)

Improvement of Output Extraction Efficiency by Optimizing Edge Structure of Circular Defect in Photonic Crystal Laser

Yuki Adachi, Issei Sada, Masato Morifuji, Hirotake Kajii, Akihiro Maruta, Masahiko Kondow

physica status solidi (a)　2024/01/17　Research paper (scientific journal)

Investigation into Oxidation Width of AlGaO_x Cladding Layer for Circular Defect in 2D Photonic Crystal Laser

Rubing Zuo, Hanqiao Ye, Ryosei Kinoshita, Munenari Kataguchi, Masato Morifuji, Hirotake Kajii, Akihiro Maruta, Masahiko Kondow

physica status solidi (a)　2023/11/22　Research paper (scientific journal)

Enhancement of Er luminescence from bridge-type photonic crystal nanocavities with Er, O-co-doped GaAs

Zhidong Fang, Jun Tatebayashi, Ryohei Homi, Masayuki Ogawa, Hirotake Kajii, Masahiko Kondow, Kyoko Kitamura, Brandon Mitchell, Shuhei Ichikawa, Yasufumi Fujiwara

Optics Continuum　Vol. 2　No. 10　p. 2178-2178　2023/10/03　Research paper (scientific journal)

Improved Characteristics of Fluorene‐type Polymer Light‐Emitting Devices Based on Multilayer Formation from Polymers and Solution‐Processable Wide Bandgap Inorganic Copper(I) Thiocyanate with p‐Type Conduction and High Refractive Index

Hirotake Kajii, Yuto Takayama, Shinsei Yamada, Maowei Huang, Masahiko Kondow

physica status solidi (a)　2023/07/02　Research paper (scientific journal)

Semitransparent Organic Position Sensitive Detector with Thin Ag Electrode toward the Angle Detection of Incident Light Using Stacked‐Type Device

Izuto Takimoto, Hirotake Kajii, Ryo Takahashi, Ayumu Nagakawa, Takahiro Miyazaki, Keizo Kanazawa, Hiroshi Murakami, Suzuka Fujita, Taichiro Morimune

physica status solidi (a)　2023/06/14　Research paper (scientific journal)

Advanced dry etching of GaAs/AlGaAs multilayer wafer with InAs quantum dot for circular defect in photonic crystal laser

Yuki Adachi, Yifan Xiong, Hanqiao Ye, Rubing Zuo, Masaya Morita, Kenta Kaichi, Ryosei Kinoshita, Masato Morifuji, Akihiro Maruta, Hirotake Kajii, Masahiko Kondow

IEICE Electronics Express　Vol. 20　No. 7　p. 20230054-20230054　2023/04/10　Research paper (scientific journal)

Controlling Thickness of ZnSe Intermediate Shell Narrows FWHM of Green‐Emitting Spectra of InP/ZnSe/ZnS Multi‐Shell Quantum Dots

Akihito Okamoto, Haruki Bai, Shintaro Toda, Maowei Huang, Hirotake Kajii, Kentaro Kawai, Hirohiko Murakami

ChemNanoMat　Vol. 9　No. 5　p. e202200534-1-e202200534-6　2023/03/03　Research paper (scientific journal)

Investigating wavelength bandwidth of orthogonal lattice waveguide for circular defect in two-dimensional photonic crystal (CirD) lasers

Rubing Zuo, Shotaro Hirata, Shota Aomori, Masaya Morita, Hanqiao Ye, Hirotake Kajii, Masato Morifuji, Akihiro Maruta, Masahiko Kondow

Japanese Journal of Applied Physics　Vol. 62　No. 2　p. 022002-022002　2023/02/01　Research paper (scientific journal)

Fabrication and Characteristics of Weak Microcavity AC-driven Insulated Polymer Electroluminescent Devices with Dielectric Film Mirrors Utilizing Ferroelectric Polymer Poly(vinylidene fluoride-trifluoroethylene) Film

Hirotake Kajii, Yuto Takayama, Masato Morifuji, Masahiko Kondow

2022 29th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD)　p. 150-151　2022/07/05　Research paper (international conference proceedings)

光センサ応用にむけた狭帯域有機光電変換デバイス

梶井博武, 森宗太一郎

Vol. 59　No. 3　p. 123-130　2022/06　Research paper (scientific journal)

Direction‐Selectable Ultra‐Highly Oriented State of Donor–Acceptor Conjugated Polymer Induced by Slow Bar Coating Process

Yuta Yabuuchi, Yu Minowa, Hirotake Kajii, Shusaku Nagano, Akihiko Fujii, Masanori Ozaki

Advanced Electronic Materials　p. 2100313-2100313　2021/07/08　Research paper (scientific journal)

Study on Bulk-Heterojunction Organic Photodetectors Based on Inverted Structure toward Near-Infrared Narrowband-Light Detection Devices

Hirotake Kajii, Masahiko Kondow

2021 28th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD)　2021/06/29　Research paper (international conference proceedings)

Molecular orientation and electrical properties in tert ‐butylated phthalocyanine thin film fabricated by uniaxial solution coating

Genya Uzurano, Yuta Yabuuchi, Ryo Ishiura, Makoto Yoneya, Shusaku Nagano, Hirotake Kajii, Akihiko Fujii, Masanori Ozaki

Electronics and Communications in Japan　Vol. 104　No. 1　p. 113-119　2021/03　Research paper (scientific journal)

Theoretical investigation on communication bandwidth of an orthogonal symmetry-based photonic crystal waveguide for wavelength division multiplexing

Takuya Yamaguchi, Masato Morifuji, Hirotake Kajii, Masahiko Kondow

Photonics and Nanostructures - Fundamentals and Applications　Vol. 43　p. 100892-100892　2021/02　Research paper (scientific journal)

Theoretical Analysis on Operation Speed of the Circular Defect in 2D Photonic Crystal (CirD) Laser

Hanqiao Ye, Tomoya Nishimura, Yifan Xiong, Takuya Yamaguchi, Masato Morifuji, Hirotake Kajii, Masahiko Kondow

physica status solidi (a)　Vol. 218　No. 3　p. 2000411-2000411　2021/02　Research paper (scientific journal)

Microcavity polymer electroluminescent devices with solution-processed dielectric distributed Bragg reflectors utilizing inorganic copper (I) thiocyanate and insulating polymers

Hirotake Kajii, Masahiko Yoshinaga, Tatsuya Karaki, Masato Morifuji, Masahiko Kondow

Organic Electronics　Vol. 88　p. 106011-106011　2021/01　Research paper (scientific journal)

Oblique Deposition of Ti/Pt/Au Electrode on Photonic Crystal for Vertical Current Injection

Hanqiao Ye, Ryota Saeki, Yifan Xiong, Takashi Kogure, Masato Morifuji, Hirotake Kajii, Akihiro Maruta, Masahiko Kondow

Applied Sciences　Vol. 10　No. 23　p. 8377-8377　2020/11/25　Research paper (scientific journal)

Molecular Orientation and Electrical Properties in tert-Butylated Phthalocyanine Thin Film Fabricated by Uniaxial Solution Coating

Genya Uzurano, Yuta Yabuuchi, Ryo Ishiura, Makoto Yoneya, Shusaku Nagano, Hirotake Kajii, Akihiko Fujii, Masanori Ozaki

IEEJ Transactions on Electronics, Information and Systems　Vol. 140　No. 11　p. 1182-1188　2020/11/01　Research paper (scientific journal)

Evaluations of Selective Dry Etching of GaAs Core Layer having Embedded InAs Quantum Dots Using Optical Measurements towards Photonic Crystal Laser Fabrication

Takumi Okunaga, Tatsuhiro Nozue, Yifan Xiong, Hirotake Kajii, Masato Morifuji, Jun Tatebayashi, Yasufumi Fujiwara, Tsutomu Nishihashi, Masahiko Kondow

2020 27th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD)　2020/09　Research paper (international conference proceedings)

Selective dry etching of GaAs/AlO<inf>x </inf>for realizing electrical isolation on monolithic integrated photonic crystal laser array

Yifan Xiong, Yoshiki Tani, Xiaolong Cong, Masato Morifuji, Hirotake Kajii, Akihiro Maruta, Masahiko Kondow

Japanese Journal of Applied Physics　Vol. 59　No. 8　p. 086505-1-086505-6　2020/08/01　Research paper (scientific journal)

Thermal Annealing Effect of Thin Films Using Yellow Emissive Poly(p-phenylene vinylene) Derivative towards Top-Gated Heterostructure Polymer Light-Emitting Transistors Based on Dissimilar Conjugated Polymers

梶井博武, 近藤正彦

電子情報通信学会論文誌 C(Web)　Vol. J103-C　No. 4　p. 211-218　2020/04　Research paper (scientific journal)

Top‐Gated Polymer Light‐Emitting Transistors Based on the Device Fabrication without Intermixing of Poly(methyl methacrylate) Gate Dielectric Formed from Fluorine‐Based Orthogonal Solvent

Hirotake Kajii, Takayuki Mashimo, Mikio Hara, Yutaka Ohmori, Masahiko Kondow

physica status solidi (a)　Vol. 217　No. 3　p. 1900531-1900531　2020/02　Research paper (scientific journal)

Invited: Polymer Light-Emitting Devices with Selectively Transparent Photonic Crystals Consisting of Printed Inorganic/Organic Hybrid Dielectric Films

Hirotake Kajii, Masahiko Yoshinaga, Tatsuya Karaki, Mahiro Kawata, Hiyuto Okui, Masato Morifuji, Masahiko Kondow

IMFEDK 2019 - International Meeting for Future of Electron Devices, Kansai　p. 31-34　2019/11　Research paper (international conference proceedings)

Effect of Device Structure on the Narrow-band Light Detection of Bulk Heterostructure Organic Photodetectors based on Poly(3-hexylthiophene) and Fullerene Derivative

Hiyuto Okui, Hirotake Kajii, Masahiko Kondow

AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings　2019/07　Research paper (international conference proceedings)

Photonic Crystal Circular Defect (CirD) Laser

Yifan Xiong, Hanqiao Ye, Takuma Umeda, Shun Mizoguchi, Masato Morifuji, Hirotake Kajii, Akihiro Maruta, Masahiko Kondow

Photonics　Vol. 6　No. 2　p. 54-54　2019/05/20　Research paper (scientific journal)

Photonic Crystal Circular-Defect Microcavity Laser Designed for Wavelength Division Multiplexing

Xiong Yifan, Umeda Takuma, Zhang Xiuyu, Morifuji Masato, Kajii Hirotake, Maruta Akihiro, Kondow Masahiko

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　Vol. 24　No. 6　2018/11

Single-crystalline thin-film growth via solution-mediated polymorphic transformation of octahexyl-substituted phthalocyanine and its optical anisotropy

Yusaku Anzai, Takuya Higashi, Hirotake Kajii, Akihiko Fujii, Masanori Ozaki

Organic Electronics: physics, materials, applications　Vol. 60　p. 16-21　2018/09/01　Research paper (scientific journal)

Fabrication of inorganic/organic hybrid distributed Bragg reflectors based on inorganic CuSCN for all-solution-processed polymer light-emitting diodose

Hirotake Kajii, Mahiro Kawata, Hiyuto Okui, Masato Morifuji, Masahiko Kondow

AM-FPD 2018 - 25th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings　2018/08/15　Research paper (international conference proceedings)

Fundamental and future prospects of printed ambipolar fluorene-type polymer light-emitting transistors for improved external quantum efficiency, mobility, and emission pattern

Hirotake Kajii

Japanese Journal of Applied Physics　Vol. 57　No. 5　2018/05/01　Research paper (scientific journal)

Fabrication of field-effect transistor utilizing oriented thin film of octahexyl-substituted phthalocyanine and its electrical anisotropy based on columnar structure

Masashi Ohmori, Mitsuhiro Nakatani, Hirotake Kajii, Ayano Miyamoto, Makoto Yoneya, Akihiko Fujii, Masanori Ozaki

Japanese Journal of Applied Physics　Vol. 57　No. 3　2018/03/01　Research paper (international conference proceedings)

Optical coupling characteristics between a circular defect resonator and a waveguide in a two-dimensional photonic crystal slab

Yuji Miyamoto, Yifan Xiong, Tomoyuki Okada, Masato Morifuji, Hirotake Kajii, Masahiko Kondow

Photonics and Nanostructures - Fundamentals and Applications　Vol. 31　p. 168-172　2018　Research paper (scientific journal)

Dry etching of deep air holes in GaAs/AlGaAs-based epi-wafer having InAs quantum dots for fabrication of photonic crystal laser

Xiuyu Zhang, Kento Takeuchi, Xiaolong Cong, Yifan Xiong, Masato Morifuji, Akihiro Maruta, Hirotake Kajii, Masahiko Kondow

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 56　No. 12　2017/12　Research paper (scientific journal)

Electroluminescence emission patterns of organic light-emitting transistors based on crystallized fluorene-type polymers (vol 56, 03BA01, 2017)

Hirotake Kajii, Takahiro Ohtomo, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 56　No. 12　2017/12

1.3 mu m lasing of circular defect cavity photonic crystal laser with an AlOx cladding layer

Xiuyu Zhang, Takafumi Hino, Satoshi Kasamatsu, Shobu Suga, Elbert He, Yifan Xiong, Masato Morifuji, Hirotake Kajii, Akihiro Maruta, Masahiko Kondow

IEICE ELECTRONICS EXPRESS　Vol. 14　No. 18　2017/09　Research paper (scientific journal)

Improved characteristics of polymer photodetectors using phosphonic acid-based self-Assembled monolayer treatment for interfacial-engineering of Ga-doped ZnO electrodes

Hirotake Kajii, Yoshinori Mohri, Hiyuto Okui, Masahiko Kondow, Yutaka Ohmori

AM-FPD 2017 - 24th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings　Vol. 57　No. 3　p. 288-291　2017/08/08　Research paper (international conference proceedings)

Electroluminescence emission patterns of organic light-emitting transistors based on crystallized fluorene-type polymers

Hirotake Kajii, Takahiro Ohtomo, Yutaka Ohmori

Japanese Journal of Applied Physics　Vol. 56　No. 3　2017/03/01　Research paper (international conference proceedings)

Organic light-emitting and photodetector devices for flexible optical link and sensor devices: Fundamentals and future prospects in printed optoelectronic devices for high-speed modulation

Hirotake Kajii

IEICE Electronics Express　Vol. 14　No. 20　p. 20172002-1-20172002-16　2017　Research paper (scientific journal)

Photonic crystal laser with low-Quality factor

Yifan Xiong, Xiuyu Zhang, Elbert He, Ryo Tezuka, Takafumi Hino, Satoshi Kasamatsu, Masato Morifuji, Hirotake Kajii, Masahiko Kondow

Conference Digest - IEEE International Semiconductor Laser Conference　2016/12/02　Research paper (international conference proceedings)

ポリマー電子・光デバイスの萌芽期－現状－将来への期待

大森 裕, 梶井 博武

電子情報通信学会論文誌 C　Vol. J99-C　No. 12　p. 659-667　2016/12　Research paper (scientific journal)

Improved Sensitivity and Durability of Poly(3-Hexylthiophene)-Based Polymeric Photodetectors Using Indium Tin Oxide Modified by Phosphonic Acid-Based Self-Assembled Monolayer Treatment

Hirotake Kajii, Yusuke Sato, Taichiro Morimune, Yutaka Ohmori

ELECTRONICS AND COMMUNICATIONS IN JAPAN　Vol. 99　No. 7　p. 48-54　2016/07　Research paper (scientific journal)

Improved carrier balance and polarized in-plane light emission at full-channel area in ambipolar heterostructure polymer light-emitting transistors

Takahiro Ohtomo, Kazuya Hashimoto, Hitoshi Tanaka, Yutaka Ohmori, Masanori Ozaki, Hirotake Kajii

ORGANIC ELECTRONICS　Vol. 32　p. 213-219　2016/05　Research paper (scientific journal)

Printable Organic Light-Emitting Devices and Application for Optical Signal Transmission

Yutaka Ohmori, Takahiro Ohtomo, Kazuya Hashimoto, Hitoshi Tanaka, Koichi Hiraoka, Shiro Iwata, Katsumi Yoshino, Alex Cook, Anver A. Zakhidov, Hirotake Kajii

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY　Vol. 16　No. 4　p. 3228-3234　2016/04　Research paper (scientific journal)

Organic Position-Sensitive Detectors Based on ZnO:Al and CuPc:C-60

Taichiro Morimune, Hirotake Kajii, Hiroki Nishimaru, Shinji Ono

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY　Vol. 16　No. 4　p. 3414-3419　2016/04　Research paper (scientific journal)

Carrier transport and improved emission properties of bilayer polymer light-emitting transistors based on crystalized poly(alkylfluorene) films

Hirotake Kajii, Kazuya Hashimoto, Mikio Hara, Takahiro Ohtomo, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 55　No. 2　2016/02　Research paper (scientific journal)

Preface to the Special Issue on "The 2015 Kansai-section Joint Convention of Institutes of Electrical Engineering"

Kajii Hirotake

IEEJ Transactions on Electronics, Information and Systems　Vol. 136　No. 11　p. 1499-1499　2016

Two wavelength polarization-sensitive organic photodetectors utilizing bilayer oriented Fluorene-Type conjugated polymers

Hirotaka Oyama, Hirotake Kajii, Yutaka Ohmori

IEEJ Transactions on Fundamentals and Materials　Vol. 136　No. 11　p. 685-689　2016　Research paper (scientific journal)

Improved characteristics of polymer light-emitting diode based on poly(alkylfluorene) with functional layer fabricated by contact printing method

H. Kajii, K. Mizuno, Y. Ohmori

INDIA-JAPAN EXPERT GROUP MEETING ON BIOMOLECULAR ELECTRONICS & ORGANIC NANOTECHNOLOGY FOR ENVIRONMENT PRESERVATION (IJEGMBE 2015)　Vol. 704　2016　Research paper (international conference proceedings)

Electroluminescence Emission Patterns of Organic Light-Emitting Transistors Based on Crystallized Fluorene-Type Polymers

Hirotake Kajii, Takahiro Ohtomo, Yutaka Ohmori

2016 23RD INTERNATIONAL WORKSHOP ON ACTIVE-MATRIX FLATPANEL DISPLAYS AND DEVICES (AM-FPD)　p. 290-293　2016　Research paper (international conference proceedings)

Effects of molecular packing on the field-effect mobility and external quantum efficiency of ambipolar polymer light-emitting transistors incorporating a donor-acceptor polymer

Hitoshi Tanaka, Hirotake Kajii, Yutaka Ohmori

SYNTHETIC METALS　Vol. 203　p. 10-15　2015/05　Research paper (scientific journal)

Improved sensitivity and durability of poly(3-hexylthiophene) based polymeric photodetectors using indium-tin-oxide modified by phosphonic acid-based self-assembled monolayer treatment

Hirotake Kajii, Yusuke Sato, Taichiro Morimune, Yutaka Ohmori

IEEJ Transactions on Electronics, Information and Systems　Vol. 135　No. 2　p. 168-173　2015/02/01　Research paper (scientific journal)

Influence of Polymer Gate Dielectrics on p-Channel and n-Channel Formation of Fluorene-type Polymer Light-emitting Transistors

Hirotake Kajii, Masato Ise, Hitoshi Tanaka, Takahiro Ohtomo, Yutaka Ohmori

IEICE TRANSACTIONS ON ELECTRONICS　Vol. E98C　No. 2　p. 139-142　2015/02　Research paper (scientific journal)

In-plane light emission of organic light-emitting transistors with bilayer structure using ambipolar semiconducting polymers

Hirotake Kajii, Hitoshi Tanaka, Yusuke Kusumoto, Takahiro Ohtomo, Yutaka Ohmori

ORGANIC ELECTRONICS　Vol. 16　p. 26-33　2015/01　Research paper (scientific journal)

Improved performance of polymer photodetectors using indium-tin-oxide modified by phosphonic acid-based self-assembled monolayer treatment

Yusuke Sato, Hirotake Kajii, Yutaka Ohmori

ORGANIC ELECTRONICS　Vol. 15　No. 8　p. 1753-1758　2014/08　Research paper (scientific journal)

Improved electron injection from silver electrode for all solution-processed polymer light-emitting diodes with Cs2CO3: conjugated polyelectrolyte blended interfacial layer

Tatsuro Yamamoto, Hirotake Kajii, Yutaka Ohmori

ORGANIC ELECTRONICS　Vol. 15　No. 6　p. 1077-1082　2014/06　Research paper (scientific journal)

Properties of polymer light-emitting transistors with Ag-nanowire source/drain electrodes fabricated on polymer substrate

Koichi Hiraoka, Yusuke Kusumoto, Ikuya Ikezoe, Hirotake Kajii, Yutaka Ohmori

THIN SOLID FILMS　Vol. 554　p. 184-188　2014/03　Research paper (scientific journal)

Influence of source/drain electrodes on external quantum efficiency of ambipolar organic light-emitting transistors

Ikuya Ikezoe, Hitoshi Tanaka, Koichi Hiraoka, Hirotake Kajii, Yutaka Ohmori

ORGANIC ELECTRONICS　Vol. 15　No. 1　p. 105-110　2014/01　Research paper (scientific journal)

Characteristics of polymer photodetectors using Ga-doped ZnO electrode modified by self-assembled monolayer treatment

Yi-Wei Liao, Yusuke Sato, Hirotake Kajii, Yutaka Ohmori

2014 IEEE INTERNATIONAL MEETING FOR FUTURE OF ELECTRON DEVICES, KANSAI (IMFEDK)　2014　Research paper (international conference proceedings)

Printable Top-Gate-Type Polymer Light-Emitting Transistors with Surfaces of Amorphous Fluoropolymer Insulators Modified by Vacuum Ultraviolet Light Treatment

Hirotake Kajii, Daiki Terashima, Yusuke Kusumoto, Ikuya Ikezoe, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 52　No. 4　2013/04　Research paper (scientific journal)

Effects of film morphology on ambipolar transport of top- gate-type polymer light-emitting transistors utilizing ambipolar polymer-blend films

Hirotake Kajii, Kyohei Koiwai, Hitoshi Tanaka, Yutaka Ohmori

Proceedings of the 20th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, AM-FPD 2013　p. 171-174　2013　Research paper (international conference proceedings)

SOLUTION PROCESSED ORGANIC LIGHT-EMITTING DIODES AND PHOTODIODES UTILIZING POLY (ALKYLFLUORENE) DERIVATIVES

Yutaka Ohmori, Tatsuro Yamamoto, Hiroki Ohmori, Hirotake Kajii

2013 18TH MICROOPTICS CONFERENCE (MOC)　2013　Research paper (international conference proceedings)

Characteristics of Solution-Processed Phosphorescent Organic Light-Emitting Diodes Utilizing Low Molecular Carbazole Derivative as a Host Material

Naoto Oda, Hirotake Kajii, Yutaka Ohmori

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 581　No. 1　p. 70-75　2013/01　Research paper (scientific journal)

Top-gate type, ambipolar, phosphorescent light-emitting transistors utilizing liquid-crystalline semiconducting polymers by the thermal diffusion method

Hirotake Kajii, Yusuke Kusumoto, Ikuya Ikezoe, Yutaka Ohmori

ORGANIC ELECTRONICS　Vol. 13　No. 11　p. 2358-2364　2012/11　Research paper (scientific journal)

Photocurrent enhancement and photoresponse properties of organic photodetectors with iridium complexes doped in conjugated polymers

Hirotake Kajii, Akihiro Katsura, Hiroki Ohmori, Yusuke Sato, Tatsunari Hamasaki, Yutaka Ohmori

JOURNAL OF NON-CRYSTALLINE SOLIDS　Vol. 358　No. 17　p. 2504-2507　2012/09　Research paper (scientific journal)

6,13-Bis(triisopropylsilylethynyl) Pentacene Organic Field-Effect Transistors Utilizing Poly(p-silsesquioxane) Insulating Layers with Various Ratios of Phenol Groups

Yuta Nakanishi, Hirotake Kajii, Koki Tamura, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 51　No. 4　2012/04　Research paper (scientific journal)

Fluorene-type polymer photodetectors doped with iridium and platinum complexes as opto-electrical conversion devices

Hirotake Kajii, Hiroki Ohmori, Yusuke Sato, Akihiro Katsura, Yutaka Ohmori

Materials Research Society Symposium Proceedings　Vol. 1435　No. January　p. 24-29　2012　Research paper (international conference proceedings)

Characteristics and Transient Electroluminescence of Alq(3)-based Organic Light-Emitting Diodes with LiF:Al Alloy Cathode

Tomofumi Ikeda, Hirotake Kajii, Yutaka Ohmori

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 567　p. 143-148　2012　Research paper (scientific journal)

Influence of UV Irradiation on Characteristics of Ambipolar Organic Field-Effect Transistors Utilizing Poly(alkylfluorene)

Daiki Terashima, Yusuke Kusumoto, Hirotake Kajii, Yutaka Ohmori

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 567　p. 39-43　2012　Research paper (scientific journal)

Fast Transient Response of Multilayer Polymer Light-Emitting Devices Using Fluorene Derivatives for the Electro-Optical Conversion Devices

Toshinari Kojima, Hirotake Kajii, Yutaka Ohmori

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 567　p. 138-142　2012　Research paper (scientific journal)

Performance of blue fluorescence and red phosphorescent organic light-emitting diodes using a molecular material with high hole drift mobility

Tomoyuki Oshiro, Takeshi Tamura, Hiroshi Kageyama, Yasuhiko Shirota, Hirotake Kajii, Yutaka Ohmori

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 12　Vol. 9　No. 12　p. 2549-2552　2012　Research paper (international conference proceedings)

Effects of film morphology on ambipolar transport in top-gate-type organic field-effect transistors using poly(9,9-dioctylfluorene-co-bithiophene)

Kyohei Koiwai, Hirotake Kajii, Yutaka Ohmori

SYNTHETIC METALS　Vol. 161　No. 19-20　p. 2107-2112　2011/10　Research paper (scientific journal)

Current-Density Dependence of Transient Properties in Green Phosphorescent Organic Light-Emitting Diodes

Hirotake Kajii, Noriyoshi Takahota, Yadong Wang, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 50　No. 4　2011/04　Research paper (scientific journal)

MoO3 as a Cathode Buffer Layer Material for the Improvement of Planar pn-Heterojunction Organic Solar Cell Performance

Hiroshi Kageyama, Hirotake Kajii, Yutaka Ohmori, Yasuhiko Shirota

APPLIED PHYSICS EXPRESS　Vol. 4　No. 3　2011/03　Research paper (scientific journal)

Multi layer Polyfluorene-Based Light-Emitting Diodes for Frequency Response Up to 100 MHz

Hirotake Kajii, Toshinari Kojima, Yutaka Ohmori

IEICE TRANSACTIONS ON ELECTRONICS　Vol. E94C　No. 2　p. 190-192　2011/02　Research paper (scientific journal)

Layered poly(alkylfluorene) light emitting diodes for optical signal transmission

Toshinari Kojima, Hirotake Kajii, Yutaka Ohmori

Conference Program - MOC'11: 17th Microoptics Conference　2011　Research paper (international conference proceedings)

Current density dependence of transient electroluminescence in phosphorescent organic light-emitting diodes

Hirotake Kajii, Noriyoshi Takahota, Yadong Wang, Yutaka Ohmori

Materials Research Society Symposium Proceedings　Vol. 1286　p. 19-24　2011　Research paper (international conference proceedings)

Fabrication and characteristics of ambipolar, light-emitting organic field effect transistors utilizing blended polyfluorene derivatives

Kyohei Koiwai, Hirotake Kajii, Yutaka Ohmori

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 2　Vol. 8　No. 2　2011　Research paper (international conference proceedings)

Performance of Organic Light-Emitting Diodes Using an Emissive Material with High Hole Drift Mobility

Takeshi Tamura, Hiroshi Kageyama, Yasuhiko Shirota, Hirotake Kajii, Yutaka Ohmori

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 538　p. 98-102　2011　Research paper (scientific journal)

N-channel organic field-effect transistors containing carbonyl-bridged bithiazole derivative fabricated using polyfluorene derivatives as solution-processed buffer layers

Hirotake Kajii, Yutaka Ie, Masashi Nitani, Youhei Hirose, Yoshio Aso, Yutaka Ohmori

ORGANIC ELECTRONICS　Vol. 11　No. 12　p. 1886-1890　2010/12　Research paper (scientific journal)

Top-gate-type ambipolar organic field-effect transistors with indium-tin oxide drain/source electrodes using polyfluorene derivatives

Hirotake Kajii, Kyohei Koiwai, Youhei Hirose, Yutaka Ohmori

ORGANIC ELECTRONICS　Vol. 11　No. 4　p. 509-513　2010/04　Research paper (scientific journal)

Enhanced emission from polymeric light-emitting diodes utilizing poly(9,9-dioctylfluorene) derivatives

Yutaka Ohmori, Ryotaro Takata, Daisuke Kasama, Hirotake Kajii

Optics InfoBase Conference Papers　2010　Research paper (international conference proceedings)

Fabrication and characteristics of polyfluorene based organic photodetectors using fullerene derivatives

Tatsunari Hamasaki, Taichiro Morimune, Hirotake Kajii, Satoshi Minakata, Ryoji Tsuruoka, Toshiki Nagamachi, Yutaka Ohmori

THIN SOLID FILMS　Vol. 518　No. 2　p. 548-550　2009/11　Research paper (scientific journal)

Visible to near-infrared organic light-emitting diodes using phosphorescent materials by solution process

Hirotake Kajii, Kunitoshi Kimpara, Yutaka Ohmori

THIN SOLID FILMS　Vol. 518　No. 2　p. 551-554　2009/11　Research paper (scientific journal)

Optical property of poly(9,9-dioctylfluorene) gel with beta phase and application to polymer light emitting diode

Daisuke Kasama, Ryotaro Takata, Hirotake Kajii, Yutaka Ohmori

THIN SOLID FILMS　Vol. 518　No. 2　p. 559-562　2009/11　Research paper (scientific journal)

Organic Devices for Integrated Photonics

Yutaka Ohmori, Hirotake Kajii

PROCEEDINGS OF THE IEEE　Vol. 97　No. 9　p. 1627-1636　2009/09　Research paper (scientific journal)

Transient Electroluminescence of White Organic Light-Emitting Diodes with Blue Phosphorescent and Red Fluorescent Emissive Layers

Hirotake Kajii, Noriyoshi Takahota, Yasuhiro Sekimoto, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 48　No. 4　2009/04　Research paper (scientific journal)

Improved light emission utilizing polyfluorene derivatives by thermal printing and solution process

Daisuke Kasama, Ryotaro Takata, Hirotake Kajii, Jun Inoue, Katsumi Yoshino, Yutaka Ohmori

Proceedings of SPIE - The International Society for Optical Engineering　Vol. 7415　2009　Research paper (international conference proceedings)

Organic photo sensors operating at high speed utilizing poly(9,9-dioctylfluorene) derivative and fullerene derivative fabricated by solution process

Yutaka Ohmori, Tatsunari Hamasaki, Hirotake Kajii, Taichiro Morimune

OPTICAL SENSORS 2009　Vol. 7356　2009　Research paper (international conference proceedings)

Organic Photodetectors Using Triplet Materials Doped in Polyalkylfluorene

Tatsunari Hamasaki, Taichiro Morimune, Hirotake Kajii, Yutaka Ohmori

IEICE TRANSACTIONS ON ELECTRONICS　Vol. E91C　No. 12　p. 1859-1862　2008/12　Research paper (scientific journal)

Polymer light-emitting diodes fabricated using poly(9,9-dioctylfuorene) gel by thermal printing method

Hirotake Kajii, Daisuke Kasama, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 47　No. 4　p. 3152-3155　2008/04　Research paper (scientific journal)

Optical and electroluminescent properties of samarium complex-based organic light-emitting diodes

Zenken Kin, Hirotake Kajii, Yasuchika Hasegawa, Tsuyoshi Kawai, Yutaka Ohmori

THIN SOLID FILMS　Vol. 516　No. 9　p. 2735-2738　2008/03　Research paper (scientific journal)

Effect of fabrication process on characteristics of phosphorescence organic light emitting diodes with methoxy-substituted starburst low-molecule as a host

Hirotake Kajii, Yasuhiro Sekimoto, Yuichi Hino, Yutaka Ohmori

THIN SOLID FILMS　Vol. 516　No. 9　p. 2772-2775　2008/03　Research paper (scientific journal)

Novel fluorescent aluminum complexes based on N-hydroxy-3,6-diaryl-4-phenyl-2-pyridone ligands

Satoshi Minakata, Hiroshi Inada, Mitsuo Komatsu, Hirotake Kajii, Yutaka Ohmori, Manabu Tsumura, Kiyoyuki Namura

CHEMISTRY LETTERS　Vol. 37　No. 3　p. 248-249　2008/03　Research paper (scientific journal)

Investigation of interfaces between insulator and active layer, and between active layer and electrodes in n-type organic field-effect transistors

Shohei Fukuda, Hirotake Kajii, Hiroshi Okuya, Toshiyuki Ogata, Motoki Takahashi, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 47　No. 2　p. 1307-1310　2008/02　Research paper (scientific journal)

Effect of hydroxyl group of polymer gate insulators on characteristics of dihexylsexithiophene organic field-effect transistors using poly(p-silsesquioxane) derivatives

Hirotake Kajii, Hiroshi Okuya, Akinori Sakakibara, Shohei Fukuda, Toshiyuki Ogata, Motoki Takahashi, Yutaka Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 47　No. 2　p. 1311-1314　2008/02　Research paper (scientific journal)

Effect of hydroxyl group on the characteristics of solution processed n- and p-type ofets using poiy(p-silsesquioxane) derivatives as a gate insulator

Yutaka Ohmori, Hirotake Kajii, Shohei Fukuda, Toshiyuki Ogata, Motoki Takahashi

Materials Research Society Symposium Proceedings　Vol. 1029　p. 52-57　2008　Research paper (international conference proceedings)

Organic white light-emitting diodes using fluorescent and phosphorescent materials for color tunable devices

Yasuhiro Sekimoto, Hirotake Kajii, Yutaka Ohmori

Journal of Light and Visual Environment　Vol. 32　No. 2　p. 120-123　2008　Research paper (scientific journal)

High-speed organic photo-detectors fabricated by vacuum and solution processes and application for optical transmission

Yutaka Ohmori, Tatsunari Hamasaki, Taichiro Morimune, Hirotake Kajii

ORGANIC OPTOELECTRONICS AND PHOTONICS III　Vol. 6999　2008　Research paper (international conference proceedings)

Organic light-emitting diodes with highly conductive polymer electrodes as anode and their stress tolerance

Hirotake Kajii, Yutaka Ohmori, Hideki Maki, Yasuhiro Sekimoto, Yasuhiro Shigeno, Naoya Takehara, Hiroshi Nakagawa

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 47　No. 1　p. 460-463　2008/01　Research paper (scientific journal)

Synthesis and spectroscopic properties of new fluorescent 3,6-diaryl-4-phenyl-2-pyridone derivatives

Satoshi Minakata, Shouta Moriwaki, Hiroshi Inada, Mitsuo Komatsu, Hirotake Kajii, Yutaka Ohmori, Manabu Tsumura, Kiyoyuki Namura

CHEMISTRY LETTERS　Vol. 36　No. 8　p. 1014-1015　2007/08　Research paper (scientific journal)

Energy Transfer Employing Europium Complex and Blue Phosphorescent Dye and Its Application in White Organic Light-Emitting Diodes

Hino Yuichi, Kajii Hirotake, Ohmori Yutaka

Jpn J Appl Phys　Vol. 46　No. 4　p. 2673-2677　2007/04/30

New fabrication of organic light-emitting devices by thermal printing method

Hirotake Kajii, Daisuke Kasama, Yohei Hirose, Yutaka Ohmori

2007 IEEE LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2　p. 129-130　2007　Research paper (international conference proceedings)

Study on electron injection of phosphorescent polymer light-emitting diodes utilizing CsF/metal cathode

Zenken Kin, Yuichi Hino, Hirotake Kajii, Yutaka Ohmori

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 462　p. 225-232　2007/01　Research paper (scientific journal)

Photoluminescence and Electroluminescence in Combination of Rare-Earth Metal Complexes and Phosphorescent Molecules

Kin, Zenken, Hino, Yuichi, Kajii, Hirotake, Hasegawa, Yasuchika, Kawai, Tsuyoshi, Ohmori, Yutaka

MRS Online Proceedings Library (OPL)　Vol. 965　p. 1-6　2006/12/01　Research paper (scientific journal)

Flexible organic field-effect transistors based on the composites with the same thiophene backbone by wet process

Hirotake Kajii, Hiroshi Okuya, Shohei Fukuda, Akinori Sakakibara, Yutaka Ohmori

IEICE TRANSACTIONS ON ELECTRONICS　Vol. E89C　No. 12　p. 1779-1780　2006/12　Research paper (scientific journal)

Optical and electroluminescent properties of 3,4,6-triphenyl-alpha-pyrone

Zenken Kin, Hirotake Kajii, Yutaka Ohmori, Mitsuo Komatsu, Satoshi Minakata, Manabu Tsumura, Kiyoyuki Namura

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　Vol. 67　No. 11　p. 2326-2330　2006/11　Research paper (scientific journal)

Investigation of photoluminescence and electroluminescence in combination of Eu complex and blue phosphorescent dye doped system

Yuichi Hino, Hirotake Kajii, Yutaka Ohmori

IEICE TRANSACTIONS ON ELECTRONICS　Vol. E89C　No. 10　p. 1465-1468　2006/10　Research paper (scientific journal)

Frequency Response Properties of Organic Photo-Detectors as Opto-Electrical Conversion Devices

Taichiro Morimune, Hirotake Kajii, Yutaka Ohmori

JOURNAL OF DISPLAY TECHNOLOGY　Vol. 2　No. 2　p. 170-174　2006/06　Research paper (scientific journal)

Effects of CsF/metal interface on electron injection in polymer light-emitting diodes

Zenken Kin, Kazuo Yoshihara, Hirotake Kajii, Kohtaku Hayashi, Yutaka Ohmori

Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　Vol. 45　No. 4 B　p. 3737-3741　2006/04/25　Research paper (scientific journal)

Study of transient electroluminescence process using organic light-emitting diode with partial doping layer

H Kajii, K Takahashi, JS Kim, Y Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　Vol. 45　No. 4B　p. 3721-3724　2006/04　Research paper (scientific journal)

Transient characteristics of polyfluorene-based polymer light-emitting diodes and their application for color tunable devices

Y Hino, H Kajii, Y Ohmori

THIN SOLID FILMS　Vol. 499　No. 1-2　p. 359-363　2006/03　Research paper (scientific journal)

Organic transistors with indium tin oxide electrodes for driving organic light emitting diode

H Kajii, A Sakakibara, H Okuya, T Monimune, Y Ohmori

THIN SOLID FILMS　Vol. 499　No. 1-2　p. 415-419　2006/03　Research paper (scientific journal)

Characteristics of optical response in red organic light-emitting diodes using two dopant system for application to the optical link devices

JS Kim, H Kajii, Y Ohmori

THIN SOLID FILMS　Vol. 499　No. 1-2　p. 343-348　2006/03　Research paper (scientific journal)

Patterning of organic light-emitting diodes utilizing a sputter deposited amorphous carbon nitride buffer layer

Z Kin, H Kajii, Y Ohmori

THIN SOLID FILMS　Vol. 499　No. 1-2　p. 392-395　2006/03　Research paper (scientific journal)

High-speed organic photodetectors using heterostructure with phthalocyanine and perylene derivative

Taichiro Morimune, Hirotake Kajii, Yutaka Ohmori

Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　Vol. 45　No. 1 B　p. 546-549　2006/01/20　Research paper (scientific journal)

Study on electron injection effect of low molecular organic light-emitting diodes utilizing LiF/Al and Ll/Al cathode

Zenken Kin, Hirotake Kajii, Yutaka Ohmori

Materials Research Society Symposium Proceedings　Vol. 965　p. 246-251　2006　Research paper (international conference proceedings)

Special section on towards the realization of organic molecular electronics

Teruaki Katsube, Mitsuyoshi Onoda, Yuki Hasegawa, Hiroyuki Fujii, Eiji Itoh, Hirotake Kajii, Tohru Kubota, Kazuhiro Kudo, Yutaka Majima, Yoko Matsuzawa, Satoshi Mikoshiba, Hitoshi Muguruma, Shuichi Nagamatsu, Kazuhiro Saito, Kazunari Shinbo, Takao Someya, Okihiro Sugihara

IEICE Transactions on Electronics　Vol. E89-C　No. 12　p. 1725-1726　2006　Research paper (scientific journal)

Organic photonic devices utilizing nano-structured materials

H. Kajii, T. Morimune, H. Maki, Y. Hino, Z. Kin, Y. Ohmori

QUANTUM SENSING AND NANOPHOTONIC DEVICES III　Vol. 6127　2006　Research paper (international conference proceedings)

Study on cathode compositions and electron injection for efficient polymer light-emitting diodes

Zenken Kin, Hirotake Kajii, Yutaka Ohmori

KOBUNSHI RONBUNSHU　Vol. 63　No. 10　p. 681-685　2006　Research paper (scientific journal)

High-speed photo-response properties of organic photo-detectors utilizing copper-phthalocyanine as an imaging devices

Taichiro Morimune, Hirotake Kajii, Yutaka Ohmori

2006 IEEE LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2　p. 921-+　2006　Research paper (international conference proceedings)

Semitransparent organic photodetectors utilizing sputter-deposited indium tin oxide for top contact electrode

T Morimune, H Kajii, Y Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　Vol. 44　No. 4B　p. 2815-2817　2005/04　Research paper (scientific journal)

Red phosphorescent organic light-emitting diodes using mixture system of small-molecule and polymer host

Y Hino, H Kajii, Y Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　Vol. 44　No. 4B　p. 2790-2794　2005/04　Research paper (scientific journal)

Polymeric organic integrated devices

Yutaka Ohmori, Hirotake Kajii

Optics InfoBase Conference Papers　2005　Research paper (international conference proceedings)

Organic light emitting diode with mixture of phosphorescent and fluorescent materials driven by pulsed current

Yutaka Ohmori, Yuichi Hino, Hirotake Kajii

Polymer Preprints, Japan　Vol. 54　No. 2　p. 4446-4447　2005　Research paper (international conference proceedings)

Efficient polymeric light emitting diodes for flexible display

Yutaka Ohmori, Hirotake Kajii, Yuichi Hino, Yasuhiro Shigeno, Naoya Takehara, Hiroshi Nakagawa, Kosuke Sasada

Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS　Vol. 2005　p. 714-715　2005　Research paper (international conference proceedings)

High-speed response properties of organic photo-detector as an opto- electrical conversion device

Taichiro Morimune, Hirotake Kajii, Yutaka Ohmori

Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS　Vol. 2005　p. 856-857　2005　Research paper (international conference proceedings)

Oligothiophene organic transistors using poly(3-hexylthiophene) fabricated by spin coating

H Kajii, H Okuya, A Sakakibara, Y Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　Vol. 44　No. 50-52　p. L1567-L1569　2005　Research paper (scientific journal)

Polymer device of poly(3-hexylthiophene) with a cathode fabricated from silver nanoparticles by wet processing

H Kajii, H Maki, Z Kin, T Morimune, Y Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　Vol. 44　No. 24-27　p. L882-L884　2005　Research paper (scientific journal)

Efficient polymeric light emitting diodes for flexible display

Y Ohmori, H Kajii, Y Hino, Y Shigeno, N Takehara, H Nakagawa, K Sasada

2005 IEEE LEOS Annual Meeting Conference Proceedings (LEOS)　p. 713-714　2005　Research paper (international conference proceedings)

Highly efficient organic light emitting devices with combination of fluorescent and phosphorescent materials for color tunable diode fabricated by all-wet process

Y Ohmori, Y Hino, H Kajii

PHOTONIC MATERIALS, DEVICES, AND APPLICATIONS, PTS 1 AND 2　Vol. 5840　p. 126-133　2005　Research paper (international conference proceedings)

Fabrication and characteristics of low-molecular phosphorescent organic light-emitting diodes employed by wet-process

Y Hino, H Kajii, Y Ohmori

IEICE TRANSACTIONS ON ELECTRONICS　Vol. E87C　No. 12　p. 2053-2058　2004/12　Research paper (scientific journal)

Organic light emitting diode using starburst molecule doped with rubrene fabricated by wet-processing for application on an electro-optical conversion device

H Kajii, K Takahashi, Y Hino, Y Ohmori

IEICE TRANSACTIONS ON ELECTRONICS　Vol. E87C　No. 12　p. 2059-2063　2004/12　Research paper (scientific journal)

Efficient low-molecule phosphorescent organic light-emitting diodes fabricated by wet-processing

Y Hino, H Kajii, Y Ohmori

ORGANIC ELECTRONICS　Vol. 5　No. 5　p. 265-270　2004/09　Research paper (scientific journal)

Realization of Polymeric Optical Integrated Devices utilizing Organic Light Emitting Diodes and Photo Detectors Fabricated on a Polymeric Waveguide,

Yutaka Ohmori, Hirotake Kajii, Masamitsu Kaneko, Katsumi Yoshino, Masanori Ozaki, Akihiko Fujii, Makoto Hikita, Hisataka Takenaka

IEEE J. Selected Topics in Quantum Electronics　2004/02　Research paper (scientific journal)

Fabrication and characteristics of flexible layered polymeric electroluminescent diodes fabricated by all-wet process

Y Ohmori, Y Hino, H Kajii

ORGANIC OPTOELECTRONICS AND PHOTONICS　Vol. 5464　p. 137-144　2004　Research paper (international conference proceedings)

Organic Electroluminescent Diode Fabricated on Indium-Tin-Oxide-Coated Polyimide Substrate as an Electro-optical Conversion Device for Polymeric Waveguides

Kajii Hirotake, Taneda Takayuki, Kaneko Masamitsu, Ohmori Yutaka

Jpn J Appl Phys　Vol. 42　No. 4　p. 2530-2533　2003/04/15

Fast response of organic photodetectors utilizing multilayered metal-phthalocyanine thin films

M Kaneko, T Taneda, T Tsukagawa, H Kajii, Y Ohmori

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　Vol. 42　No. 4B　p. 2523-2525　2003/04　Research paper (scientific journal)

High-speed operation of organic electroluminescent diodes and photo-detectors for application of optical integrated devices

Yutaka Ohmori, Hirotake Kajii, Takayuki Taneda, Masamitsu Kaneko, Makoto Hikita, Hisataka Takenaka

Molecular Crystals and Liquid Crystals　Vol. 405　p. 1-10　2003　Research paper (international conference proceedings)

Fabrication and characteristics of layered polymeric electroluminescent diodes by all wet-process for flexible display

Y Hino, M Yamazaki, H Kajii, Y Ohmori

2003 IEEE LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2　p. 535-536　2003　Research paper (international conference proceedings)

High speed response of organic light emitting diodes and photo-detectors fabricated on a polymeric substrate for polymeric optical integrated circuits

Y Ohmori, H Kajii, T Taneda, M Kaneko, T Fujiki, K Takahashi

ELECTRONICS ON UNCONVENTIONAL SUBSTRATES-ELECTROTEXTILES AND GIANT-AREA FLEXIBLE CIRCUITS　Vol. 736　p. 233-238　2003　Research paper (international conference proceedings)

Paper-like display utilizing organic electrolumineseent diodes fabricated on 10 micron-thick polyimide films

Y Ohmori, H Kajii, T Taneda

ELECTRONICS ON UNCONVENTIONAL SUBSTRATES-ELECTROTEXTILES AND GIANT-AREA FLEXIBLE CIRCUITS　Vol. 736　p. 159-164　2003　Research paper (international conference proceedings)

High-speed operation of organic electroluminescent diodes and photodetectors for application of optical integrated devices

Y Ohmori, H Kajii, T Taneda, M Kaneko, M Hikita, H Takenaka

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 405　p. 1-10　2003　Research paper (scientific journal)

Organic light emitting diodes and photo detectors fabricated on a polymeric substrate for flexible optical integrated devices

Y Ohmori, H Kajii, T Taneda, M Kaneko

FLEXIBLE ELECTRONICS-MATERIALS AND DEVICE TECHNOLOGY　Vol. 769　p. 131-140　2003　Research paper (international conference proceedings)

Pore symmetry dependence of band gap of nanoscale periodic porous graphites with differenet pore shapes

H Takeda, H Kajii, K Yoshino

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　Vol. 41　No. 6A　p. 3782-3786　2002/06　Research paper (scientific journal)

Transient Properties of Organic Electroluminescent Diode Using 8-Hydroxyquinoline Aluminum Doped with Rubrene as an Electro-Optical Conversion Device for Polymeric Integrated Devices.

Kajii Hirotake, Tsukagawa Takahisa, Taneda Takayuki, Yoshino Katsumi, Ozaki Masanori, Fujii Akihiko, Hikita Makoto, Tomaru Satoru, Imamura Saburo, Takenaka Hisataka, Kobayashi Junya, Yamamoto Fumio, Ohmori Yutaka

Japanese Journal of Applied Physics　Vol. 41　No. 4　p. 2746-2748　2002

Organic electroluminescent devices and organic photo detectors for polymeric optical integrated devices

Y Ohmori, H Kajii, T Taneda, A Kaneko, B Hikita

2002 IEEE/LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2　p. 301-302　2002　Research paper (international conference proceedings)

Polymeric optical integrated devices with high-speed operated organic electroluminescent diodes as a light source

Y Ohmori, H Kajii, T Taneda, T Tsukagawa, M Hikita, S Tomaru, H Takenaka

DESIGN AND FABRICATION OF PLANAR OPTICAL WAVEGUIDE DEVICES AND MATERIALS　Vol. 4805　p. 106-113　2002　Research paper (international conference proceedings)

High speed operation of organic electroluminescent diodes: Application for polymeric optical integrated circuits

Y Ohmori, H Kajii, T Taneda, T Tsukagawa, M Kaneko

JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY　Vol. 15　No. 2　p. 271-272　2002　Research paper (scientific journal)

Optical properties of Zn(II) complex using 1,2-bis(8-hydroxyquinolin-2-yl)ethane

H Kajii, T Taneda, Y Ohmori, M Onoda, A Yoneda

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS　Vol. 7　No. 5　p. 845-848　2001/09　Research paper (scientific journal)

Enhanced electroluminescence utilizing p-sexiphenyl for the blue light source

H Kajii, T Tsukagawa, H Okuno, T Taneda, K Yoshino, Y Ohmori

THIN SOLID FILMS　Vol. 393　No. 1-2　p. 388-392　2001/08　Research paper (scientific journal)

Enhancement of electroluminescence utilizing confined energy transfer for red light emission

Y Ohmori, H Kajii, T Sawatani, H Ueta, K Yoshino

THIN SOLID FILMS　Vol. 393　No. 1-2　p. 407-411　2001/08　Research paper (scientific journal)

Organic electroluminescent diodes as a light source for polymeric waveguides - Toward organic integrated optical devices

Yutaka Ohmori, Makoto Hikita, Hirotake Kajii, Takahisa Tsukagawa, Katsumi Yoshino, Masanori Ozaki, Akihiko Fujii, Satoru Tomaru, Saburo Imamura, Hisataka Takenaka, Junya Kobayashi, Fumio Yamamoto

Thin Solid Films　Vol. 393　No. 1-2　p. 267-272　2001/08/01　Research paper (international conference proceedings)

Temperature and voltage dependent optical properties of conducting polymer in synthetic opal as photonic crystal

S.Satoh, H.Kajii, Y.Kawagishi, T.Tamura, A.Fujii, M.Ozaki, R.D.McCullough, K.Yoshino

Synthetic Metals, Vol.121, pp.1503-1504　2001/08　Research paper (scientific journal)

Tunable optical properties of conducting polymers infiltrated in synthetic opal as photonic crystal

K.Yoshino, S.Satoh, Y.Shimoda, H.Kajii, T.Tamura, Y.Kawagishi, A.Fujii, M.Ozaki

Synthetic Metals, Vol.121, pp.1459-1462　2001/08　Research paper (scientific journal)

Organic Electroluminescent Diodes as a Light Source for Polymeric Integrated Devices

Yutaka Ohmori, Hirotake Kajii, Takahisa Tsukagawa, Katsumi Yoshino, Masanori Ozaki, Akihiko Fujii, Makoto Hikita, Satoru Tomaru, Sabro Imamura, Hisataka Takenaka, Junya Kobayashi, Fumio Yamamoto

Proceedings of SPIE Photonics West, Organic Photonic Materials and Devices III　Vol. 4279　p. 109-116　2001/06/15　Research paper (scientific journal)

Enhanced blue light electroluminescence utilizing heterostructure of p-sexiphenyl and TPD

Y Ohmori, T Tsukagawa, H Kajii

DISPLAYS　Vol. 22　No. 2　p. 61-64　2001/05　Research paper (scientific journal)

Novel Electrical and Optical Properties of Liquid Crystals Infiltrated in Opal as Photonic Crystal

K.Yoshino, Y.Shimoda, K.Nakayama, T.Tamura, T.Matsui, H.Kajii, M.Ozaki

Mol.Cryst.Liq.Cryst., Vol.364, pp.501-509　2001/04　Research paper (scientific journal)

Application of Organic Electroluminescent Diodes using 8-Hydroxyquinoline Aluminum doped with Rubrene to the Electro-Optical Conversion Device for Polymeric Integrated Devices

H.Kajii, T.Taneda, T.Tsukagawa, K. Yoshino, M.Ozaki, A.Fujii, M.Hikita, S.Tomaru, S.Imamura, H.Takenaka, J.Kobayashi, F.Yamamoto, Y.Ohmori

J.Soc.Elect.Mat.Eng., Vol.10, pp.151-154　2001/04　Research paper (scientific journal)

Electrical and optical properties of conducting polymer-C-60-carbon nanotube system

SB Lee, T Katayama, H Kajii, H Araki, K Yoshino

SYNTHETIC METALS　Vol. 121　No. 1-3　p. 1591-1592　2001/03　Research paper (scientific journal)

Novel Properties of periodic porous nanostructured carbon materials

H Kajii, H Take, K Yoshino

SYNTHETIC METALS　Vol. 121　No. 1-3　p. 1315-1316　2001/03　Research paper (scientific journal)

Electrochemical properties of macroporous carbon for electrodes of lithium-ion batteries

H Take, H Kajii, K Yoshino

SYNTHETIC METALS　Vol. 121　No. 1-3　p. 1313-1314　2001/03　Research paper (scientific journal)

Observation of carbon nanotubes synthesized on various substrates using metal-phthalocyanine

T Katayama, H Araki, H Kajii, K Yoshino

SYNTHETIC METALS　Vol. 121　No. 1-3　p. 1235-1236　2001/03　Research paper (scientific journal)

Enhanced blue light emission from sexiphenyl heterostructure EL device

Yutaka Ohmori, Takahisa Tsukagawa, Hirotake Kajii

Materials Research Society Symposium - Proceedings　Vol. 660　2001　Research paper (international conference proceedings)

High intensity blue light EL device using heterostructure of p-sexiphenyl and TPD

Y Ohmori, T Tsukagawa, H Kajii

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 370　p. 1-8　2001　Research paper (scientific journal)

Integration of organic electroluminescent diodes and polymeric waveguide devices - Characterization of light source for optical integrated circuit

Y Ohmori, H Kajii, T Tsukagawa, T Taneda, M Yamazaki, M Hikita, S Tomaru, H Takenaka

DESIGN, MANUFACTURING, AND TESTING OF PLANAR OPTICAL WAVEGUIDE DEVICES　Vol. 4439　p. 95-102　2001　Research paper (international conference proceedings)

Photoexcitations in disubstituted polyacetylene: Solitons and polarons

I. Gontia, S. V. Frolov, M. Liess, Z. V. Vardeny, E. Ehrenfreund, K. Tada, H. Kajii, R. Hidayat, A. Fujii, K. Yoshino, M. Teraguchi, T. Masuda

Synthetic Metals　Vol. 116　No. 1-3　p. 91-94　2001/01/01　Research paper (scientific journal)

Electronic energy state of a periodic porous nanoscale graphite

H Kajii, K Yoshino, T Sato, T Yamabe

JOURNAL OF PHYSICS D-APPLIED PHYSICS　Vol. 33　No. 24　p. 3146-3151　2000/12　Research paper (scientific journal)

Synthesis and properties of a soluble and widely conjugated polyacetylene with anthryl pendant

S. M. Abdul Karim, Ryoji Nomura, Hirotake Kajii, Rahmat Hidayat, Katsumi Yoshino, Toshio Masuda

Journal of Polymer Science, Part A: Polymer Chemistry　Vol. 38　p. 4717-4723　2000/11/27　Research paper (scientific journal)

Optical and electrical properties of opal carbon replica and effect of pyrolysis

H. Kajii, Y. Kawagishi, H. Take, K. Yoshino, A. A. Zakhidov, R. H. Baughman

Journal of Applied Physics　Vol. 88　No. 2　p. 758-763　2000/07/15　Research paper (scientific journal)

Metathesis polymerization of 9-(10-hexoxycarbonyl)anthrylacetylene. A route to a widely conjugated polyacetylene with excellent stability and solubility

Ryoji Nomura, S. M. Abdul Karim, Hirotake Kajii, Rahmat Hidayat, Katsumi Yoshino, Toshiono Masuda

Macromolecules　Vol. 33　No. 12　p. 4313-4315　2000/06/13　Research paper (scientific journal)

Electrical and electrochemical properties of fly ash and effect of pyrolysis

H. Take, H. Kajii, K. Yoshino

Journal of Applied Physics　Vol. 87　No. 10　p. 7316-7319　2000/05/15　Research paper (scientific journal)

Electrical and optical properties of conducting polymer and carbons in nano-scale periodic structure and their intercalation effects

K Yoshino, Y Kawagishi, S Satoh, S Lee, K Nakayama, H Take, H Kajii

MOLECULAR CRYSTALS AND LIQUID CRYSTALS　Vol. 341　p. 1289-1294　2000　Research paper (scientific journal)

Effects of substrate materials on growth of carbon nanotubes by chemical vapor deposition using metal-phthalocyanines

H Araki, H Kajii, K Yoshino

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　Vol. 38　No. 11B　p. L1351-L1353　1999/11　Research paper (scientific journal)

Electrical Properties of A Periodic Porous Carbon Replica of Opal

Katsumi Yoshino, Hirotake Kajii, Yoshiaki Kawagishi, Masanori Ozaki, Anvar Abdoulakhadovich Zakhidov, Allied Signal, and Ray, H. Baughman, Allied Signal

Jpn.~J. Appl.~Phys., Part 1, Vol.~38 No.~8, pp.~4926-4929　Vol. 38　No. 8　p. 4926-4929　1999/08　Research paper (scientific journal)

Growth of carbon nanotubes on quartz plates by chemical vapor deposition using (Ni, Fe)- phthalocyanines

H Araki, H Kajii, K Yoshino

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　Vol. 38　No. 7B　p. L836-L838　1999/07　Research paper (scientific journal)

Novel Electrical, Optical and Rheological Properties of Conducting Polymer in Liquids and Solutions Infiltrated in Opals and Inverse Opals

Yoshiaki Kawagishi, Shigenori Satoh, Sergey Lee, Hirotake Kajii, Akihiko Fujii, Masanori Ozaki, Katsumi Yoshino

1999/07　Research paper (other academic)

Alkali metal doping effect in conducting polymer-C60 composites: low-field microwave absorption and susceptibility study

H. Kajii, H. Araki, A. A. Zakhidov, M. Onada, K. Yoshino

Synthetic Metals　Vol. 103　No. 1-3　p. 2388-2391　1999/06/24　Research paper (scientific journal)

Light-induced low-field microwave absorption and ESR in conducting polymer-C-60 composites weakly doped by alkali metal

H Kajii, H Araki, AA Zakhidov, T Kawai, K Yoshino

SYNTHETIC METALS　Vol. 103　No. 1-3　p. 2425-2425　1999/06　Research paper (scientific journal)

Novel Properties of Nanoscale Organic-Inorganic Systems and Photonic Crystals-Conducting Polymers in Nanoscale Periodic Structures, Microcavities and Photonic Crystals

K.Yoshino, Y.Kawagishi, S.Tatsuhara, H.Kajii, S.Lee, M.Ozaki, Z.V.Vardeny, A.A.Zakhidov

Supperlattices and Microstructures, Vol.25, pp.325-341　1999/04　Research paper (scientific journal)

Tunable Optical Stop Band Utilizing Thermochromism of Synthetic Opal Infiltrated with Conducting Polymer.

Satoh Shigenori, Kajii Hirotake, Kawagishi Yoshiaki, Fujii Akihiko, Ozaki Masanori, Yoshino Katsumi

Japanese Journal of Applied Physics　Vol. 38　No. 12　p. L1475-L1477　1999

Electrical and optical properties of conducting polymer-fullerene and conducting polymer-carbon nanotube composites

Katsumi Yoshino, Hirotake Kajii, Hisashi Araki, Tooru Sonoda, Hiroyoshi Take, Lee Sergey

Fullerene Science and Technology　Vol. 7　No. 4　p. 695-711　1999　Research paper (scientific journal)

Optical properties of conducting polymers in nano-scale periodic structure, microcavities and photonic crystals

K. Yoshino, Y. Kawagishi, S. Tatsuhara, H. Kajii, S. Lee, A. Fujii, M. Ozaki, A. A. Zakhidov, Z. V. Vardeny, M. Ishikawa

Microelectronic Engineering　Vol. 47　No. 1　p. 49-53　1999　Research paper (scientific journal)

Electrical Optical Properties of Conducting Polymer - Fullerene and Conducting Polymer - Carbon Nanotube Composites and Their Applications

S. Lee, H. Araki, H. Kajii, T. Sonoda, A. Fujii, K. Yoshino

Proc. of the Third Symposium on Atomic-scale Surface and Interface Dynamics　p. 97-102　1998

Microwave heating effect on two Josephson-junction systems in granular PAT12-C60-Rb composites: Low-field microwave absorption study

Hirotake Kajii, Hisashi Araki, Anvar A. Zakhidov, Kazuya Tada, Kyuya Yakushi, Katsumi Yoshino

Physica C: Superconductivity and its Applications　Vol. 277　No. 3-4　p. 277-284　1997/04/10　Research paper (scientific journal)

Flux trapping on multi-superconducting phase PAT12-C60-Rb composite: Low-field microwave absorption study

Hisashi Araki, Hirotake Kajii, Kazuya Tada, Anvar A. Zakhidov, Kyuya Yakushi, Tohru Sekino, Koichi Niihara, Katsumi Yoshino

Solid State Communications　Vol. 103　No. 11　p. 607-614　1997　Research paper (scientific journal)

Low-field microwave absorption and ESR in 'conducting polymer-fullerene-alkali metal' superconductors: comparative study of various host matrices

H. Kajii, H. Araki, A. A. Zakhidov, K. Yakushi, K. Yoshino

Synthetic Metals　Vol. 86　No. 1　p. 2351-2352　1997　Research paper (scientific journal)

Charge transfer in fullerene-conducting polymer composite: Electronic and excitonic properties

Katsumi Yoshino, Kazuya Tada, Akihiko Fujii, Kazuhisa Hosoda, Shin-Ichi Kawabe, Hirotake Kajii, Masaharu Hirohata, Rahmat Hidayat, Hisashi Araki, Anvar A. Zakhidov, Ryu-Ichi Sugimoto, Masahiko Iyoda, Mitsuo Ishikawa, Toshio Masuda

Fullerene Science and Technology　Vol. 5　No. 7　p. 1359-1386　1997　Research paper (scientific journal)

Optical properties of di-substituted acetylene polymers

Kazuya Tada, Rahmat Hidayat, Masaharu Hirohata, Hirotake Kajii, Satoshi Tatsuhara, Akihiko Fujii, Masanori Ozaki, Masahiro Teraguchi, Toshio Masuda, Katsumi Yoshino

Proceedings of SPIE - The International Society for Optical Engineering　Vol. 3145　p. 171-178　1997　Research paper (international conference proceedings)

Novel properties of molecularly doped conducting polymers and junction devices

K. Yoshino, K. Tada, M. Hirohata, H. Kajii, Y. Hironaka, N. Tada, Y. Kaneuchi, M. Yoshida, A. Fujii, M. Hamaguchi, H. Araki, T. Kawai, M. Ozaki, Y. Ohmori, M. Onoda, M. Onoda, A. A. Zakhidov, A. A. Zakhidov

Synthetic Metals　Vol. 84　p. 477-482　1997/01/01

Multiphase superconductivity in OO-PPV/C60 composite doped by alkali metals low-field microwave absorption and SQUID study

Katsumi Yoshino, Anvar A. Zakhidov, Hirotake Kajii, Hisashi Araki, Kazuya Tada, Takanobu Noguchi, Toshihiro Ohnishi, Kyuya Yakushi

Physica C: Superconductivity and its Applications　Vol. 264　No. 3-4　p. 161-171　1996/06/15　Research paper (scientific journal)