Development of extremely low-power consumption OLEDs using ICT emission
Project/Area Number |
17H03131
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Device related chemistry
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Research Institution | Yamagata University |
Principal Investigator |
SASABE Hisahiro 山形大学, 大学院有機材料システム研究科, 准教授 (10570731)
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Co-Investigator(Kenkyū-buntansha) |
横山 大輔 山形大学, 大学院有機材料システム研究科, 准教授 (00518821)
片桐 洋史 山形大学, 大学院理工学研究科, 教授 (40447206)
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Project Period (FY) |
2017-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
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Keywords | 有機EL / 有機半導体材料 / 有機合成化学 / 有機半導体デバイス / 光化学 |
Outline of Final Research Achievements |
Thermally activated delayed fluorescence (TADF) emitters, which can realize 100% electron-to-photon conversion without use of precious platinum metals, are one of the most attractive candidates for high-performance organic light emitting devices (OLEDs). In this work, we tried to realize low-power-consumption and long life TADF OLEDs. Consequently, we successfully developed TADF OLEDs with an ultra-high power efficiency of 133 lm W–1 and an unprecedented low turn-on voltage of 2.22 V via the strategic use of exciplex host system. Further, we were able to develop a multifunctional hole-transport layer based on a hexaphenylbenzene skeleton to realize record-breaking efficient and stable green TADF OLEDs exhibiting EQE of 19.2% and operation lifetime at 50% (LT50) of over 20,000 h at an initial luminance of 1000 cd m-2.
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Academic Significance and Societal Importance of the Research Achievements |
低コストな第三世代のTADFにより超低消費電力・長寿命有機EL照明が実現できれば、爆発的な普及の大きな原動力となり、インパクトは大きい。有機ELは中小型ディスプレイで一般化しつつあり、大型でも製品化が進んでいる。超省電力有機ELデバイスの実現は、低炭素社会に大きく貢献するグリーンテクノロジーの実現であり、極めて大きな社会的意義がある。もちろん、発光材料は有機ELだけでなく、バイオイメージング、刺激応答性材料、非線形光学材料、イオンセンサー、植物栽培用光源など、多方面で重要な役割を果たす。本研究で得られる成果は、光化学、有機半導体物性物理の基礎学理の構築の立場から非常に意義があると思われる。
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Report
(4 results)
Research Products
(57 results)
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[Presentation] High-Performance Pyrimidine-Based TADF Emitters Realizing Pure Blue-to-Green Emission with EQE of 25%2017
Author(s)
Hisahiro Sasabe, Ryutaro Komatsu, Kohei Nakao, Yuya Hayasaka, Junji Kido,
Organizer
Display Week 2017, 50.4, Los Angeles Convention Center, Los Angeles, California, USA, May 25th, 2017
Related Report
Int'l Joint Research / Invited
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[Presentation] Realizing Deep-Blue TADF Emission with CIE of (0.16, 0.15) Using a Highly Twisted Acceptor Unit2017
Author(s)
Tatuya Ohsawa, Ryutaro Komatsu, Hisahiro Sasabe, Kohei Nakao, Yuya Hayasaka, Junji Kido
Organizer
Display Week 2017, P-191, Los Angeles Convention Center, Los Angeles, California, USA, May 21-26th, 2017
Related Report
Int'l Joint Research
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[Presentation] Highly Efficient Deep-blue TADF Emitters Exhibiting CIE of (0.16, 0.15) and EQE of 18% Using a Highly Twisted Acceptor Unit2017
Author(s)
Ryutaro Komatsu, Tatsuya Ohsawa, Hisahiro Sasabe, Kohei Nakao, Yuya Hayasaka, Junji Kido
Organizer
The 2nd international TADF workshop, poster No. 25, Kyushu University, Fukuoka, Japan, July 19th-21st, 2017
Related Report
Int'l Joint Research
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[Presentation] Significant Enhancement of Blue OLED Performances through Molecular Engineering of Pyrimidine-based Emitter2017
Author(s)
Kohei Nakao, Hisahiro Sasabe, Ryutaro Komatsu, Yuya Hayasaka, Tatsuya Ohsawa, Junji Kido
Organizer
The 2nd international TADF workshop, poster No. 25, Kyushu University, Fukuoka, Japan, July 19th-21st, 2017
Related Report
Int'l Joint Research
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