Koutoku Ohmi

Profile Information

Affiliation: Tottori University

Degree: (BLANK)(Hiroshima University)
(BLANK)(Hiroshima University)

Contact information: ohmitottori-u.ac.jp
J-GLOBAL ID: 200901051599889525
researchmap Member ID: 1000034401

Research Interests

Research Areas

Research History

1991 - 2000

Tottori University
1991 - 2000

Tottori University Research Assistant
2000

- 鳥取大学助教授
2000

- Tottori University, Associate Professor
1987 - 1991

株式会社小松製作所研究員
1987 - 1991

KOMATSU LTD. Researcher

Education

- 1987

Hiroshima University
- 1987

Graduate School, Division of Engineering, Hiroshima University
- 1985

Faculty of Engineering, Hiroshima University
- 1985

Faculty of Engineering, Hiroshima University

Awards

Papers

Development of Eu²⁺ and Mn²⁺ co-activated silicate phosphor for plant cultivation light source

Takashi Kunimoto, Yoshiko Fujita, Hiroshi Kajiyama, Tetsuo Honma, Hideki Kawaguchi, Tadashi Ishigaki, Koutoku Ohmi, Kentaro Ohshima, Daisuke Miyazaki, Yu Saito …

Japanese Journal of Applied Physics, 58(SF), 2019
Charge transfer state of Y<inf>4</inf>Si<inf>2</inf>O<inf>7</inf>N<inf>2</inf>:Eu³⁺ red phosphor synthesized by solid state reaction in NH<inf>3</inf> atmosphere

K. Nakamoto, M. Kawashima, T. Ishigaki, T. Kunimoto, T. Honma, K. Ohmi

Proceedings of the International Display Workshops, 2 603-605, 2018
Correlational analysis of Eu3+ charge transfer state using La effective charge in La-based mixed-Anion host compounds

Ryo Yoshimatsu, Masahiro Okada, Tadashi Ishigaki, Shinta Watanabe, Tetsuo Honma, Koutoku Ohmi

Japanese Journal of Applied Physics, 56(3), Mar, 2017
Rare-earth-free white emitting Ba2TiP2O9 phosphor: revealing its crystal structure and photoluminescence properties

Takuya Hasegawa, Sun Woog Kim, Shinnosuke Kamei, Tadashi Ishigaki, Kazuyoshi Uematsu, Koutoku Ohmi, Kenji Toda, Mineo Sato

DALTON TRANSACTIONS, 45(28) 11554-11559, 2016 Peer-reviewed
Design and fabrication of a micro reactor integrated with ph electrodes and micro mixer for nanophospher synthesis

R. Komiyama, H. Miyashita, H. Okura, T. Ishigaki, T. Kageyama, K. Ohmi, S. S. Lee

MicroTAS 2015 - 19th International Conference on Miniaturized Systems for Chemistry and Life Sciences, 2035-2037, Jan 1, 2015 Peer-reviewed
A Microfluidic Device Fully Integrated with Three pH Sensing Electrodes and Passive Mixer for Nanoparticle Synthesis

Ryohei Komiyama, Hidetoshi Miyashita, Tomoaki Kageyama, Koutoku Ohmi, Sang-Seok Lee, Hiroshi Okura

2015 IEEE SENSORS, 1176-1179, 2015 Peer-reviewed
Si-co-doped CuAlS2:Mn conductive phosphor thin films prepared by electron beam evaporation using phosphor powder pellets

Hideki Kawaguchi, Tadashi Ishigaki, Takayoshi Adachi, Yuki Oshima, Koutoku Ohmi

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 12, NO 6, 12(6) 793-796, 2015 Peer-reviewed
De-excitation process in BaMgAl10O17:Eu phosphor evaluated from vacuum-UV-excited photoluminescence spectroscopy and X-ray absorption fine structure

Takashi Kunimoto, Yoshiko Fujita, Tetsuo Honma, Youji Kageyama, Kimihiko Nakamura, Koutoku Ohmi

JAPANESE JOURNAL OF APPLIED PHYSICS, 53(5), May, 2014 Peer-reviewed
Detailed impurity phase investigation by X-ray absorption fine structure and electron spin resonance analyses in synthesis of CaMgSi<inf>2</inf>O <inf>6</inf>:Eu phosphor

Takashi Kunimoto, Tetsuo Honma, Koutoku Ohmi, Susumu Okubo, Hitoshi Ohta

Japanese Journal of Applied Physics, 52(4 PART 1), Apr, 2013
Valence estimation & local structure analysis of luminescence centers in phosphor materials by X-Ray absorption spectroscopy

Tetsuo Honma, Takashi Kunimoto, Koutoku Ohmi

Proceedings of the International Display Workshops, 1 694-698, 2013
Advanced microreactor system with glass mixer cell for synthesizing nanophosphors

Kenji Yamashina, Hiroshi Okura, Ryosuke Sakata, Ryohei Komiyama, Hidetoshi Miyashita, Sang Seok Lee, Koutoku Ohmi

Proceedings of the International Display Workshops, 1 797-798, Jan 1, 2013
X-ray Absorption Fine Structure Analysis of Valence State of Ce in Y3Al5O12:Ce Phosphor Synthesized by Coprecipitation Method

Hiroshi Okura, Takuro Murakawa, Yoshinobu Miyamoto, Tetsuo Honma, Koutoku Ohmi

JAPANESE JOURNAL OF APPLIED PHYSICS, 51(6), Jun, 2012 Peer-reviewed
Emissive Liquid-Crystal Display Panels Consisting of Red-Green-Blue Patterned Phosphor Layers and Near-Ultraviolet Light-Emitting-Diode Backlight

Tatsuya Yata, Yoshinobu Miyamoto, Koutoku Ohmi

JAPANESE JOURNAL OF APPLIED PHYSICS, 51(2), Feb, 2012 Peer-reviewed
Temperature dependence of PL excitation spectra of BaMgAl <inf>10</inf>O<inf>17</inf>:Eu in VUV region

K. Nakamura, T. Kunimoto, T. Honma, K. Ohmi

Proceedings of the International Display Workshops, 2 796-799, 2012
Photoluminescent Characteristics of Mn2+ Centers Selectively Substituted for Different Cations in CuAlS2

Yoshinobu Miyamoto, Tetsuo Honma, Koutoku Ohmi

JAPANESE JOURNAL OF APPLIED PHYSICS, 50(10), Oct, 2011 Peer-reviewed
Effect of organic-buffer-layer on electrical property and environmental reliability of Ga-doped ZnO films prepared by RF plasma assisted DC magnetron sputtering on plastic substrate

Toshio Hinoki, Chika Kyuhara, Hideaki Agura, Kenji Yazawa, Kentaro Kinoshita, Koutoku Ohmi, Satoru Kishida

THIN SOLID FILMS, 519(5) 1525-1529, Dec, 2010
Optical Properties and X-ray Absorption Fine Structure Analysis of ZnS:Cu,Cl Thin-Film Phosphors

Kunio Ichino, Haruki Kato, Yuichiro Sakai, Koutoku Ohmi, Tetsuo Honma, Jun-ichi Itoh, Asuka Sasakura

JAPANESE JOURNAL OF APPLIED PHYSICS, 49(8), Aug, 2010 Peer-reviewed
Opposite bias polarity dependence of resistive switching in n-type Ga-doped-ZnO and p-type NiO thin films

Kentaro Kinoshtia, Takumi Okutani, Hayato Tanaka, Toshio Hinoki, Kenji Yazawa, Koutoku Ohmi, Satoru Kishida

APPLIED PHYSICS LETTERS, 96(14), Apr, 2010 Peer-reviewed
Valence estimation of Eu luminescent centers of BAM phosphors by conversion electron yield and fluorescence yield XAFS measurements

T. Honma, T. Kunimoto, T. Koshiba, Y. Yamashita, K. Ohmi

IDW'10 - Proceedings of the 17th International Display Workshops, 2 1027-1030, 2010
Study on intermediate state of YAG:Ce prepared by liquid phase reaction

Takuro Murakawa, Hiroshi Okura, Tetsuo Honma, Yoshinobu Miyamoto, Koutoku Ohmi

IDW'10 - Proceedings of the 17th International Display Workshops, 2 1015-1018, 2010

Misc.

Electroluminescent and Aging Characteristics of Thin Film Electroluminescent Devices Employing Spin-Coated (Ba,Sr)TiO_3 Insulating Layers

OUCHI Yukari, YAMASAKI Michihiro, OHASHI Takayuki, OHMI Koutoku, KOBAYASHI Hiroshi, NIHOSHI Manabu

2007(1) 1-4, Jan 25, 2007
Blue-Emitting Ba_2SiS_4:Ce Thin Film Electroluminescent Devices Prepared by Electron-Beam Evaporation

MIYAZAKI Yasumori, OHASHI Tsuyoshi, OHMI Koutoku, KOBAYASHI Hiroshi

2007(1) 5-8, Jan 25, 2007
Preparation and characterization of SrGd_4Si_3O_<13>:Tb^<3+> green phosphors for Xe_2 excimer band excitation

YAMANE Akira, KUNIMOTO Takashi, NAKASHIMA Yasuhiro, OHMI Koutoku, KOBAYASHI Hiroshi

2007(1) 29-32, Jan 25, 2007
Improvement in Luminescent Characteristics of Blue Emitting Ba_2SiS_4:Ce phosphor

OHASHI Tsuyoshi, OHMI Koutoku, KOBAYASHI Hiroshi

2007(1) 25-28, Jan 25, 2007
Red-Emitting Ba_2ZnS_3:Mn Thin Film Electroluminescent Devices Prepared by Electron-Beam Evaporation

HARA Katsuhiko, YAMASAKI Michihiro, OUCHI Yukari, OHMI Koutoku, KOBAYASHI Hiroshi

ITE technical report, 30(7) 13-16, Jan 27, 2006
Excitation and luminescent characteristics of (Sr,Ba)_3MgSi_2O_8:Eu^<2+> blue phosphors

SHAO Yanlin, KUNIMOTO Takashi, YAMANE Akira, OHMI Koutoku, KOBAYASHI Hiroshi

2006(1) 113-116, Jan 26, 2006
Red-Emitting Ba_2ZnS_3:Mn Thin Film Electroluminescent : Devices Prepared by Electron-Beam Evaporation

HARA Katsuhiko, YAMASAKI Michihiro, OUCHI Yukari, OHMI Koutoku, KOBAYASHI Hiroshi

IEICE technical report, 105(568) 13-16, Jan 20, 2006
Excitation and luminescent characteristics of (Sr,Ba)_3MgSi_2O_8:Eu^<2+> blue phosphors

SHAO Yanlin, KUNIMOTO Takashi, YAMANE Akira, OHMI Koutoku, KOBAYASHI Hiroshi

IEICE technical report, 105(568) 53-56, Jan 20, 2006
Synthesis of (Ca,Sr)MgSi2O6:Eu Phosphors and Their Luminescent Characteristics under VUV Excitation.

T. Kunimoto, K. Ohmi, H. Kobayashi, S. Kuze, T. Isobe, S. Miyazaki

The proceedings for IDW ‘06 the 13th International Display Workshops., 1229-1230, 2006
Development of a new blue CaMgSi(2)O(6): Eu(2+) phosphor for PDPs

T Kunimoto, H Kobayashi, R Yoshimatsu, S Honda, E Hata, S Yamaguchi, K Ohmi

JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY, 13(11) 929-940, Nov, 2005
Green luminescent BaS:Mn^<2+> TFEL devices : prepared by electron beam evaporation merhod

SAEDA Akihiro, HARA Katuhiko, USUI Shintarou, OHMI Koutoku, KOBAYASHI Hiroshi

ITE technical report, 29(4) 25-28, Jan 28, 2005
Preparation and characterization of CaLa_4Si_3O_<13>:Tb^<3+> green PDP phosphors for Xe_2 excimer band excitation

YAMAGUCHI Shigeyasu, KUNIMOTO Takashi, SHAO Yanlin, OHMI Koutoku, KOBAYASHI Hiroshi

ITE technical report, 29(4) 49-52, Jan 28, 2005
Crystallographic and luminescent characteristics of red-emitting Ba2ZnS3 : Mn thin film electroluminescent devices prepared by electron-beam evaporation

K Ohmi, K Hara, M Yamasaki, Y Ouchi, H Kobayashi

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 44(50-52) L1535-L1537, 2005
Effects of H2S treatment on structural and luminescent characteristics of blue-emitting (Sr1-xCax)S : Cu,F thin films

M Ehara, S Hakamata, H Fukada, K Ohmi, H Kominami, Y Nakanishi, Y Hatanaka

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 43(10) 7120-7124, Oct, 2004
Borate Phosphor Thin Films Prepared by Pulsed Laser Deposition Technique

MIZUNO Manabu, KUNIMOTO Takashi, ISHISAKA Toshihide, OHMI Koutoku, TANAKA Shosaku, KOBAYASHI Hiroshi

IEICE technical report. Electronic information displays, 103(594) 49-52, Jan 17, 2004
Luminescent Characteristics of Gd^<3+> Codoped CaMgSi_2O_6:Eu^<2+> Phosphors for PDPs

YAMAGUCHI Shigeyasu, KUNIMOTO Takashi, HATA Eisuke, TANAKA Masashi, OHMI Koutoku, TANAKA Shosaku, KOBAYASHI Hiroshi

IEICE technical report. Electronic information displays, 103(594) 45-48, Jan 17, 2004
Green luminescent CaS:Tb^<3+> TFEL devices prepared by electron beam evaporation method

OKA Hidekazu, SAEDA Akihiro, OHMI Koutoku, TANAKA Shosaku, KOBAYASHI Hiroshi

IEICE technical report. Electronic information displays, 103(593) 53-56, Jan 16, 2004
Improvement in reproducibility of bluish-green Ce^<3+> luminescence characteristics by H_2O supply in SrS:Ce thin film electroluminescent devices

USUI Shintarou, TAKASU Kousuke, OKA Hidekazu, OHMI Koutoku, TANAKA Shosaku, KOBAYASHI Hiroshi

IEICE technical report. Electronic information displays, 103(593) 57-60, Jan 16, 2004
Feasibility study of silicate phosphor CaMgSi2O6 : Eu2+ as blue PDP phosphors

T Kunimoto, R Yoshimatsu, K Ohmi, S Tanaka, H Kobayashi

IEICE TRANSACTIONS ON ELECTRONICS, E85C(11) 1888-1894, Nov, 2002
Feasibility study of silicate phosphor CaMgSi2O6 : Eu2+ as blue PDP phosphors

T Kunimoto, R Yoshimatsu, K Ohmi, S Tanaka, H Kobayashi

IEICE TRANSACTIONS ON ELECTRONICS, E85C(11) 1888-1894, Nov, 2002

Professional Memberships

Research Projects

散乱光に着目したディスプレイ部材利用型ゼロ電力太陽光照明の研究

科学研究費助成事業, 基盤研究(C), 日本学術振興会, Apr, 2022 - Mar, 2025

石垣雅, 矢口雄大, 大観光徳
光合成と光形態形成を「太陽光の光質制御」で可能にする植物生育用無機蛍光体の創製

科学研究費助成事業, 基盤研究(C), 日本学術振興会, Apr, 2019 - Mar, 2022

石垣雅, 西原英治, 久郷和人, 大観光徳
p-type conductivity control in ZnMgSTe alloy semiconductors by adjusting the valence-band-edge energy

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2014 - Mar, 2017

Ichino Kunio, KASHIYAMA Shota, NANBA Nao, HASEGAWA Hiroyasu, KADOTA Masahiro, SAHASHI Kyoma
Electroluminescence prepared by printing method using phosphor fine particles

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 2011 - 2013

OHMI Koutoku, ICHINO Kunio
Study on high-efficiency chalcopyrite-based intermediate-band solar cells

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 2011 - 2013

ICHINO Kunio, OHMI Koutoku
Study on wide-area inorganic electroluminescence devices driven by current injection

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 2008 - 2010

ICHINO Kunio, OHMI Koutoku
Study of Excitation and Luminescence Process of Rare-Earth Ions Doped in Semiconductors

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 1995 - 1996

TANAKA Shosaku, OHMI Koutoku, ISHII Akira
プラズマディスプレイパネル用蛍光体材料に関する研究
カラー薄膜エレクトロルミネッセンスに関する研究
Study on Phosphor Materials for Plasma Display Panel
Study on Color Thin Film Electroluminescence

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