Kojima Kazunobu

コジマカズノブ | Kojima Kazunobu

Affiliation and department：
Job title： Professor
Homepage URL (2)： http://www.sfm.eei.eng.osaka-u.ac.jp , http://www.sfm.eei.eng.osaka-u.ac.jp/en/

Research field (3)： Semiconductors, optical and atomic physics , Nanostructure physics , Crystal engineering

Research keywords (5)： Laser illumination , Measurements of quantum efficiency of radiation , deep-ultraviolet optical wireless communication , nanoelectronics , optical characterization

Research theme for competitive and other funds (14)：

2023 - 2028 New development of Semiconductors Intracenter Photonics
2020 - 2023 六方晶窒化ボロン半導体の直接遷移型化と深紫外励起子発光ダイナミクスの研究
2020 - 2023 Synthesis of high quality single crystals for sience of Boron Nitride
2019 - 2022 Development of thermal neutron imaging sensor using BGaN semiconductor detector
2019 - 2022 LED-based optical wireless communications in the solar-blind band

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Papers (91)：

Yasuhiro Yamada, Takeru Oki, Takeshi Morita, Takumi Yamada, Mitsuki Fukuda, Shuhei Ichikawa, Kazunobu Kojima, Yoshihiko Kanemitsu. Optical Cooling of Dot-in-Crystal Halide Perovskites: Challenges of Nonlinear Exciton Recombination. Nano Letters. 2024
K. Sano, H. Fujikura, T. Konno, S. Kaneki, S. Ichikawa, K. Kojima. Switching of major nonradiative recombination centers (NRCs) from carbon impurities to intrinsic NRCs in GaN crystals. Applied Physics Letters. 2024. 124. 23
Kenjiro Uesugi, Ryota Akaike, Shuhei Ichikawa, Takao Nakamura, Kazunobu Kojima, Masahiko Tsuchiya, Hideto Miyake. 230 nm wavelength range far-UVC LED with low Al-composition differentiation between well and barrier layers of MQWs. Applied Physics Express. 2024
Takeyoshi Onuma, Kanta Kudo, Mizuki Ono, Wataru Kosaka, Kohei Shima, Kyohei Ishii, Kentaro Kaneko, Yuichi Ota, Tomohiro Yamaguchi, Kazunobu Kojima, et al. Steady-state and dynamic characteristics of deep UV luminescence in rock salt-structured MgxZn1-xO. Journal of Applied Physics. 2023. 134. 2
Akira Hirano, Yosuke Nagasawa, Masamichi Ipponmatsu, Hideki Sako, Ai Hashimoto, Ryuichi Sugie, Yoshio Honda, Hiroshi Amano, Kazunobu Kojima, Shigefusa F. Chichibu. Weak metastability of AlxGa1-xN (x=13/24, 15/24, 17/24) shown by analyzing AlGaN grown on AlN with dense macrosteps. Applied Physics Express. 2022. 15. 7. 075505-075505

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MISC (25)：

Yuki Yoshida, Kazunobu Kojima, Masaki Shiraiwa, Atsushi Kanno, Akira Hirano, Yosuke Nagasawa, Masamichi Ippommatsu, Naokatsu Yamamoto, Shigefusa F. Chichibu, Yoshinari Awaji. High-speed solar-blind optical wireless communication enabled by DUV LED. Light-Emitting Devices, Materials, and Applications XXVI. 2022
Kazunobu Kojima. Characterization of semiconductor crystals based on omnidirectional photoluminescence (ODPL) spectroscopy. Oyo Buturi. 2021. 90. 12. 726-737
小島一信, 秩父重英, 吉田悠来, 白岩雅輝, 菅野敦史, 山本直克, 淡路祥成, 平野光, 長澤陽祐, 一本松正道. 東北大学グリーンネストICT LEDを用いたノイズに強い光無線通信技術の研究~真夏の直射日光下において毎秒1ギガビット以上の通信速度を実現~. 電波技術協会報FORN. 2021. 342
小島一信, 秩父重英, 吉田悠来, 白岩雅輝, 淡路祥成, 菅野敦史, 山本直克, 長澤陽祐, 平野光. Gb/s-class solar-blind optical wireless communication by using AlGaN-based deep-ultraviolet light-emitting diodes. Optronics. 2020. 462
Characterization of AlGaN multiple-quantum-wells grown on c-plane AlN/sapphire templates with macro-steps. 2020. 47. 3. 1-8

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Patents (5)：

Books (15)：

次世代パワーエレクトロニクスの課題と評価技術
2022 ISBN:9784907002930
Characterization of semiconductor crystals based on omnidirectional photoluminescence (ODPL) spectroscopy
Journal of the Japanese Association for Crystal Growth 2022
全方位フォトルミネセンス(ODPL)分光法を用いた半導体結晶の評価
応用物理 90(12) 726-737 2021
13. 東北大学グリーンネストICT LEDを用いたノイズに強い光無線通信技術の研究~真夏の直射日光下において毎秒1ギガビット以上の通信速度を実現~
電波技術協会報FORN (342) 2021
マクロステップを持つc面AlN/サファイアテンプレート上に成長させたAlGaN量子井戸の物性評価
日本結晶成長学会誌 2020

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Lectures and oral presentations (418)：

AlGaN半導体の深紫外光物性と通信応用
(レーザー学会学術講演会第45回年次大会)
Increased Below-Bandgap Absorption in CsPbBr3/Cs4PbBr6 through Post-Annealing and Regrowth
(2024 Materials Research Society Fall Meeting (2024 MRS Fall Meeting))
Ultrafast Surface Carrier Recombination in Semiconductors Evaluated by Two-photon Photoemission Spectroscopy
(2024 Materials Research Society Fall Meeting (2024 MRS Fall Meeting))
スパッタアニールAlN上に作製した深紫外AlGaN LEDの顕微ELイメージング測定
(電子情報通信学会レーザ・量子エレクトロニクス研究会(LQE) 2024)
Ir/sapphire基板上(001)ヘテロエピタキシャルダイヤモンド結晶のIr/Diamond界面における結晶品質評価
(第38回ダイヤモンドシンポジウム)

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Work history (8)：

2021/12 - 現在 Osaka University Graduate School of Engineering, Division of Electrical, Electronic and Infocommunications Engineering Professor
2014/04 - 2021/12 Tohoku University Institute of Multidisciplinary Research for Advanced Materials Associate Professor
2011/07 - 2014/03 Kyoto University Graduate School of Engineering
2011/07 - 2014/03 Kyoto University Graduate School of Engineering, Department of Electronic Science and Engineering
2008/10 - 2011/06 Kyoto University Graduate School of Engineering, Department of Electronic Science and Engineering

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Committee career (16)：

2022 - 現在 Scientific reports Editorial board member
2022 - 現在ナノテスティング学会企画運営委員会委員
2024 - 2024 IWN2024 Program committee
2018 - 2024 光電相互変換第125委員会幹事委員
2023 - 2023 ICNS-14 論文委員会委員

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Awards (12)：

2024/11 - 公益社団法人応用物理学会第57回(2024年秋季)応用物理学会講演奨励賞円偏光InGaN LED構造の作製と特性評価
2024/04 - The 10th Conference on Light-Emitting Devices and Their Industrial Application (LEDIA 2024) Young Researcher’s Paper Award Combinational integration of Eu-doped GaN and InGaN LEDs and their prospects for miniaturization
2021/03 - IOP Publishing Outstanding Reviewer Award (Applied Physics Express)
2019/12 - ナイトライド基金研究奨励賞窒化物半導体量子構造における発光現象の定量的理解に関する研究
2019/10 - 光電相互変換第125委員会研究奨励賞全方位フォトルミネッセンス法による絶対輻射量子効率測定

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Association Membership(s) (3)：

The Institute of NANO Testing (INANOT) , THE LASER SOCIETY OF JAPAN , THE JAPAN SOCIETY OF APPLIED PHYSICS

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