〒819-0395
福岡市西区元岡744
最先端有機光エレクトロニクス
研究センター
共進化社会システム
イノベーション施設224

Center for Organic Photonics and Electronics Research (OPERA)
Co-Evolutional Social Systems Building #224
744 Motooka, Nishi, Fukuoka
819-0395, Japan

TEL: 092-802-6920
FAX: 092-802-6921

adachi[at]cstf.kyushu-u.ac.jp

 
 

合志 憲一

略歴
2004年 千歳科学技術大学大学院修士課程修了
2006年 千歳科学技術大学大学院博士後期課程修了
2006年 日本学術振興会特別研究員(PD)
2007年 (独)情報通信研究機構・専攻研究員
2008年 東北大学大学院工学研究科応用化学専攻・助教
2009年 九州大学未来化学創造センター・学術研究員
2010年 11月 九州大学工学研究院応用化学部門・助教
学位
博士(理工学)(千歳科学技術大学 2006年)
所属学会
応用物理学会
研究分野
有機光エレクトロニクス、有機光物理
趣味
カメラ、旅行
コメント
頑張ります

研究成果

論文発表

[49] Numerical study of triplet dynamics in organic semiconductors under lasing and the triplet management by TADF aiming for continuous lasing

Ayano Abe; Kenichi Goushi; Atula S. D. Sandanayaka; Ryutaro Komatsu; Takashi Fujihara; Masashi Mamada; Chihaya Adachi

The Journal of Physical Chemistry Letters13, 5, 1323 – 1329, 2022

DOI: https://doi.org/10.1021/acs.jpclett.1c03983

 

[48] Hot exciplexes in U-shaped TADF molecules with emission from locally excited states

A. Lennart Schleper, Kenichi Goushi, Christoph Bannwarth, Bastian Haehnle, Philipp J. Welscher, Chihaya Adachi, Alexander J. C. Kuehne

Nature Communications, 12, 6179, 2021

DOI: https://doi.org/10.1038/s41467-021-26439-w 

 

[47] Recycling of Triplets into Singlets for High-Performance Organic Lasers

Chathuranganie A. M. Senevirathne; Seiya Yoshida; Morgan Auffray; Masayuki Yahiro; Buddhika S. B. Karunathilaka; Fatima Bencheikh; Kenichi Goushi; Atula S. D. Sandanayaka; Toshinori Matsushima; Chihaya Adachi

Advanced Optical Materials, 2101302, 2021

DOI: https://doi.org/10.1002/adom.202101302

 

[46] Markedly Improved Performance of Optically Pumped Organic Lasers with Two-Dimensional Distributed-Feedback Gratings

Chathuranganie A. M. Senevirathne; Atula S.D. Sandanayaka; Buddhika S.B. Karunathilaka; Takashi Fujihara; Fatima Bencheikh; Chuanjiang Qin; Kenichi Goushi; Toshinori Matsushima; Chihaya Adachi

ACS photonics8, 5, 1324 – 1334, 2021

DOI: http://dx.doi.org/10.1021/acsphotonics.0c01728

 

[45] Synthesis and Characterization of 5,5′-Bitetracene

Masashi Mamada; Kenichi Goushi; Ryota Nakamura; Hironori Kaji; Chihaya Adachi

Chemistry Letters50, 4, 800 – 803, 2021

DOI: https://doi.org/10.1246/cl.200909

 

[44] Realizing near-infrared laser dyes through a shift in excited state absorption

Reiko Aoki; Ryutaro Komatsu; Kenichi Goushi; Masashi Mamada; Soo Young Ko; Jeong Weon Wu; Virginie Placide; Anthony D’Aléo; Chihaya Adachi

Advanced Optical Materials, 2001947, 2021

DOI: https://doi.org/10.1002/adom.202001947

 

[43] Suppression of external quantum efficiency rolloff in organic light emitting diodes by scavenging triplet excitons

Buddhika S. B. Karunathilaka; Umamahesh Balijapalli; Chathuranganie A. M. Senevirathne; Seiya Yoshida; Yu Esaki; Kenichi Goushi; Toshinori Matsushima; Atula S. D. Sandanayaka; Chihaya Adachi

Nat Commun, 11, 4926, 2020

DOI: https://doi.org/10.1038/s41467-020-18292-0

 

[42] An organic laser dye having a small singlet-triplet energy gap makes the selection of a host material easier

Buddhika S. B. Karunathilaka; Umamahesh Balijapalli; Chathuranganie A. M. Senevirathne; Yu Esaki; Kenichi Goushi; Toshinori Matsushima; Atula S. D. Sandanayaka; Chihaya Adachi

Advanced Functional Materials, 2001078, 2020

DOI: https://doi.org/10.1002/adfm.202001078

 

[41] Triplet management for efficient perovskite light-emitting diodes

Chuanjiang Qin ; Toshinori Matsushima; William J. Potscavage Jr; Atula S. D. Sandanayaka, ; Matthew R. Leyden; Fatima Bencheikh; Kenichi Goushi; Fabrice Mathevet; Benoît Heinrich; Go Yumoto; Yoshihiko Kanemitsu; Chihaya Adachi

Nature Photonics , 14, 70 – 75, 2020

DOI: https://doi.org/10.1038/s41566-019-0545-9

 

[40] Intersystem Crossing Rate in Thermally Activated Delayed Fluorescence Emitters

Takashi Kobayashi; Daisuke Kawate; Akitsugu Niwa; Takashi Nagase; Kenichi Goushi; Chihaya Adachi; Hiroyoshi Naito

Physica Status Solidi A, 217, 3, 1900616, 2020

DOI: https://doi.org/10.1002/pssa.201900616

 

[39] Observation of Nonradiative Deactivation Behavior from Singlet and Triplet States of Thermally Activated Delayed Fluorescence Emitters in Solution

Naoto Notsuka; Hajime Nakanotani; Hiroki Noda; Kenichi Goushi; Chihaya Adachi

Phys. Chem. Lett. , 11, 2, 562 – 566, 2020

DOI: https://doi.org/10.1021/acs.jpclett.9b03302

 

[38] Triplet–triplet upconversion enhanced by spin–orbit coupling in organic light-emitting diodes

Ryota Ieuji; Kenichi Goushi; Chihaya Adachi

Nature Communications, 10, 5283, 2019

DOI: https://doi.org/10.1038/s41467-019-13044-1

 

[37] Indication of current-injection lasing from an organic semiconductor

Atula S. D. Sandanayaka; Toshinori Matsushima; Fatima Bencheikh; Shinobu Terakawa; William J. Potscavage Jr.; Chuanjiang Qin; Takashi Fujihara; Kenichi Goushi; Jean-Charles Ribierre; Chihaya Adachi

Applied Physics Express, 12, 6, 061010, 2019

DOI: https://doi.org/10.7567/1882-0786/ab1b90

 

[36] Distributed Feedback Lasers and Light-Emitting Diodes Using 1-Naphthylmethylamnonium Low-Dimensional Perovskite

Matthew R. Leyden; Shinobu Terakawa; Toshinori Matsushima; Shibin Ruan; Kenichi Goushi; Morgan Auffray; Atula S. D. Sandanayaka; Chuanjiang Qin; Fatima Bencheikh; Chihaya Adachi

ACS Photonics, 6, 2, 460 – 466, 2019

DOI: http://dx.doi.org/10.1021/acsphotonics.8b01413

 

[35] Triplet-triplet annihilation in a thermally activated delayed fluorescence emitter lightly doped in a host

Akitsugu Niwa; Shota Haseyama; Takashi Kobayashi; Takashi Nagase; Kenichi Goushi; Chihaya Adachi; Hiroyoshi Naito

Appl. Phys. Lett., 113, 083301, 2018

DOI: https://doi.org/10.1063/1.5025870

 

[34] Enhanced Electroluminescence from Organic Light-Emitting Diodes with an Organic-Inorganic Perovskite Host Layer

Toshinori Matsushima; Chuanjiang Qin; Kenichi Goushi; Fatima Bencheikh; Takeshi Komino; Matthew Leyden; Atula S. D. Sandanayaka; Chihaya Adachi

Adv. Mater., 30, 38, 1802662, 2018

DOI: https://doi.org/10.1002/adma.201802662

 

[33] Observation of spontaneous orientation polarization in evaporated films of organic light-emitting diode materials

Kohei Osada; Kenichi Goushi; Hironori Kaji; Chihaya Adachi; Hisao Ishii; Yutaka Noguchi

Org. Electron., 58, 313 – 317, 2018

DOI: https://doi.org/10.1016/j.orgel.2018.04.026

 

[32] Emission properties of thermally activated delayed fluorescence emitters: analysis based on a four level model considering a higher triplet excited state

Takashi Kobayashi; Akitsugu Niwa; Shota Haseyama; Kensho Takaki; Takashi Nagase; Kenichi Goushi; Chihaya Adachi; Hiroyoshi Naito

Photon. Energy, 8, 3, 032104, 2018

DOI: http://dx.doi.org/10.1117/1.JPE.8.032104

 

[31] Confinement of long-lived triplet excitons in organic semiconducting host-guest systems

Naoto Notsuka; Ryota Kabe; Kenichi Goushi; Chihaya Adachi

Advanced Functional Materials, 27, 40, 1703902, 2017

DOI: https://doi.org/10.1002/adfm.201703902

 

[30] Toward continuous-wave operation of organic semiconductor lasers

Atula S. D. Sandanayaka; Toshinori Matsushima; Fatima Bencheikh; Kou Yoshida; Munetomo Inoue; Takashi Fujihara; Kenichi Goushi; Jean-Charles Ribierre; Chihaya Adachi

Science Advances, 3, 4, e1602570, 2017

DOI: http://dx.doi.org/10.1126/sciadv.1602570

 

[29] Control of the Singlet–Triplet Energy Gap in a Thermally Activated Delayed Fluorescence Emitter by Using a Polar Host Matrix

Shota Haseyama; Akitsugu Niwa; Takashi Kobayashi; Takashi Nagase; Kenichi Goushi; Chihaya Adachi ; Hiroyoshi Naito

Nanoscale Research Letters, 12, 268, 2017

DOI: http://dx.doi.org/10.1186/s11671-017-2012-1

 

[28] Contributions of a Higher Triplet Excited State to the Emission Properties of a Thermally Activated Delayed-Fluorescence Emitter

Takashi Kobayashi; Akitsugu Niwa; Kensho Takaki; Shota Haseyama; Takashi Nagase; Kenichi Goushi; Chihaya Adachi; Hiroyoshi Naito

Phys. Rev. Applied, 7, 034002, 2017

DOI: https://doi.org/10.1103/PhysRevApplied.7.034002

 

[27] Photoluminescence in a Thermally Activated Delayed Fluorescence Emitter for Organic Light-emitting Diodes

Akitsugu Niwa; Kensho Takaki; Takashi Kobayashi; Takashi Nagase; Kenichi Goushi; Chihaya Adachi; Hiroyoshi Naito

Journal of the Imaging Society of Japan, 55, 2, 143 – 148, 2016

DOI: http://doi.org/10.11370/isj.55.143

 

[26] Quasi-Continuous-Wave Organic Thin-film Distributed Feedback Laser

Atula S. D. Sandanayaka; Kou Yoshida; Munetomo Inoue; Chuanjiang Qin; Kenichi Goushi; Jean-Charles Ribierre; Toshinori Matsushima; Chihaya Adachi

Advanced Optical Materials, 4, 6, 834 – 839, 2016

DOI: http://dx.doi.org/10.1002/adom.201600006

 

[25] Comparison of transient state and steady state exciton–exciton annihilation rates based on Förster-type energy transfer

Toshiya Yonehara; Kenichi Goushi; Tomoaki Sawabe; Isao Takasu; Chihaya Adachi

Jpn. J. Appl. Phys, 54, 071601, 2015

DOI: http://dx.doi.org/10.7567/JJAP.54.071601

 

[24] Charge Carrier Dynamics and Degradation Phenomena in Organic Light-emitting Diodes Doped by a Thermally Activated Delayed Fluorescence Emitter

Yutaka Noguchi; Hyung-Jun Kim; Ryuta Ishino; Kenichi Goushi; Chihaya Adachi; Yasuo Nakayama; Hisao Ishii

Org. Elect., 17, 184 – 191, 2015

DOI: http://www.sciencedirect.com/science/article/pii/S1566119914005576

 

[23] Highly Efficient Thermally Activated Delayed Fluorescence Emitters with Small Singlet–Triplet Energy Gap and Large Oscillator Strength

Yuta Sagara; Katsuyuki Shizu; Hiroyuki Tanaka; Hiroshi Miyazaki; Kenichi Goushi; Hironori Kaji; Chihaya Adachi

Chem. Lett., 44, 360 – 362, 2015

DOI: http://doi.org/10.1246/cl.141054

 

[22] Temperature dependence of photoluminescence properties in a thermally activated delayed fluorescence emitter

Akitsugu Niwa; Takashi Kobayashi; Takashi Nagase; Kenichi Goushi; Chihaya Adachi; Hiroyoshi Naito

Applied Physics Letters, 104, 213303, 2014

DOI: http://dx.doi.org/10.1063/1.4878397

 

[21] Influence of Host Matrix on Thermally-Activated Delayed Fluorescence: Effects on Emission Lifetime, Photoluminescence Quantum Yield, and Device Performance

Gábor Méhes; Kenichi Goushi; William J. Potscavage, Jr.; Chihaya Adachi

Org. Elect., 15, 9, 2027 – 2037, 2014

DOI: http://www.sciencedirect.com/science/article/pii/S1566119914002067

 

[20] Reduced amplified spontaneous emission threshold in organic semiconductor laser structure with relaxed roll-off characteristics under high current densities

Munetomo Inoue; Kenichi Goushi; Kuniaki Endo; Hiroko Nomura; Chihaya Adachi

Journal of Luminescence, 143, 754 – 758, 2013

DOI: http://authors.elsevier.com/sd/article/S0022231313002123

 

[19] Highly efficient organic light-emitting diodes from delayed fluorescence

Hiroki Uoyama; Kenichi Goushi; Katsuyuki Shizu; Hiroko Nomura; Chihaya Adachi

Nature, 492, 234 – 238, 2012

DOI: http://dx.doi.org/10.1038/nature11687

 

[18] Efficient organic light-emitting diodes through up-conversion from triplet to singlet excited states of exciplexes

Kenichi Goushi; Chihaya Adachi

Appl. Phys. Lett., 101, 023306, 2012

DOI: http://apl.aip.org/resource/1/applab/v101/i2/p023306_s1

 

[17] Triplet Exciton Confinement in Green Organic Light-Emitting Diodes Containing Luminescent Charge-Transfer Cu(I) Complexes

Qisheng Zhang; Takeshi Komino; Shuping Huang; Shigeyuki Matsunami; Kenichi Goushi; Chihaya Adachi

Adv. Funct. Mater., 22, 2327 – 2336, 2012

DOI: http://onlinelibrary.wiley.com/doi/10.1002/adfm.201101907/abstract

 

[16] Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion

Kenichi Goushi; Kou Yoshida; Keigo Sato; Chihaya Adachi

Nat. Photon., 6, 253 – 258, 2012

DOI: http://dx.doi.org/10.1038/nphoton.2012.31

 

[15] Two-dimensional orientation control of organic semiconducting amorphous films by mechanical brushing

Toshiharu Arai; Kenichi Goushi; Hiroko Nomura; Tomohiko Edura; Chihaya Adachi

Appl. Phys. Lett., 99, 053303, 2011

DOI: http://link.aip.org/link/?APL/99/053303

 

[14] Improvement of electroluminescence performance of organic light emitting diodes with a liquid emitting layer by introduction of electrolyte and a hole-blocking layer

Shuzo Hirata; Korefumi Kubota; Heo Hyo Jung; Osamu Hirata; Kenichi Goushi; Masayuki Yahiro; Chihaya Adachi

Adv. Mater., 23, 889 – 893, 2011

DOI: http://onlinelibrary.wiley.com/doi/10.1002/adma.201003505/abstract

 

[13] Organic field effect transistor using pentacene single crystals grown by a liquid-phase crystallization process

Y. Kimura, M. Niwano, N. Ikuma, K. Goushi, and K. Itaya

LANGMUIR, 24, 4861-4863 (2009)

DOI: https://doi.org/10.1021/la900647y

 

[12] Time-correlated single photon counting system and light-collection system for studying fluorescence emitters under high-vacuum conditions: Use of immersion objective and ionic liquid

Yamada, K. Goushi, and A. Otomo

THIN SOLID FILMS, 518, 432-436 (2009)

DOI: https://doi.org/10.1016/j.tsf.2009.07.002

 

[11] Excitation intensity dependence of power-law blinking statistics in nanocrystal quantum dots

K. Goushi, T. Yamada, and A. Otomo

JOURNAL OF PHYSICAL CHEMISTRY C, 113, 20161-20168 (2009)

DOI: https://doi.org/10.1021/jp811448k

 

[10] Time-correlated single photon counting and optical measurement systems for studying single fluorescent emitters under high vacuum conditions

T. Yamada, K. Goushi, and A. Otomo

THIN SOLID FILMS, 517, 1507-1511 (2008)

DOI: https://doi.org/10.1016/j.tsf.2008.09.029

 

[9] Charge-carrier injection characteristics at organic/organic heterojunction interfaces in organic light-emitting diodes

Toshinori Matsushima; Kenichi Goushi; Chihaya Adachi

Chem. Phys. Lett., 435, 327 – 330, 2007

DOI: http://dx.doi.org/10.1016/j.cplett.2007.01.010

 

[8] Spin-relaxation Process of Excited Triplet States of Ir(ppy)3

Kenichi Goushi; Jason Brooks; Julie. J. Brown; Hiroyuki Sasabe; Chihaya Adachi

  1. Photopolym. Sci. Technol., 19, 181 – 186, 2006

DOI: http://dx.doi.org/10.2494/photopolymer.19.181

 

[7] Phosphorescence Decay Mechanism of Ir(ppy)3 in a Solid Matrix

K. Goushi; H. Sasabe; C. Adachi

J. Photopolym. Sci. Technol., 18, 47 – 50, 2005

DOI: http://dx.doi.org/10.2494/photopolymer.18.47

 

[6] 100% fluorescence efficiency of 4,4’-bis[(N-carbazole)styryl]biphenyl in a solid film and the very low amplified spontaneous emission threshold

T. Aimono; Y. Kawamura; K. Goushi; H. Yamamoto; H. Sasabe; C. Adachi

Appl. Phys. Lett., 86, 071110, 2005

DOI: http://doi.org/10.1063/1.1867555

 

[5] 100% phosphorescence quantum efficiency of Ir(III) complexes in organic semiconductor films

Y. Kawamura; K. Goushi; J. Brooks; J. J. Brown; H. Sasabe; C. Adachi

Appl. Phys. Lett., 86, 071104, 2005

DOI: http://doi.org/10.1063/1.1862777

 

[4] Unusual Phosphorescence Characteristics of Ir(ppy)3 in a Solid Matrix at Low Temperatures

K. Goushi; Y. Kawamura; H. Sasabe; C. Adachi

Jpn. J. Appl. Phys. Part II, 43, L937 – 939, 2004

DOI: http://dx.doi.org/10.1143/JJAP.43.L937

 

[3] Triplet exciton confinement and unconfinement by adjacent hole-transport layers

K. Goushi; R. Kwong; J. J. Brown; H. Sasabe; C. Adachi

J. Appl. Phys., 95, 7798 – 7802, 2004

DOI: http://doi.org/10.1063/1.1751232

 

[2] Ultraviolet amplified spontaneous emission from thin films of 4,4’-bis(9-carbazolyl)-2,2’- biphenyl and the derivatives

Y. Kawamura; H. Yamamoto; K. Goushi; H. Sasabe; H. Yoshizaki; C. Adachi

Appl. Phys. Lett., 84, 2724 – 2726, 2004

DOI: http://doi.org/10.1063/1.1695091

 

[1] High-Efficiency Organic Electrophosphorescent Diodes Using 1, 3, 5-Triazine Electron Transport Materials

H. Inomata; K. Goushi; T. Masuko; T. Konno; T. Imai; H. Sasabe; J. J. Brown; C. Adachi

Chem. Mat., 16, 1285 – 1291, 2004

DOI: http://dx.doi.org/10.1021/cm034689t