Large reverse saturable absorption at sunlight power level using ultralong lifetime of triplet excitons
| Project/Area Number |
26708010
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Functional solid state chemistry
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Hirata Shuzo 東京工業大学, 物質理工学院, 助教 (20552227)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
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| Keywords | 三重項 / 非線形吸収 / 逆過飽和吸収 / 光制限効果 / オプティカルリミット / 室温りん光 / 多段階励起 / ステロイド / 励起三重項 / 三重項励起子 / 非制限効果 / 非線形光学 / 過飽和吸収 / 長寿命励起子 / 三重項三重項消滅 / 非コヒーレント光 / りん光 / 重水素化 / フォトクロミック材料 |
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| Outline of Final Research Achievements |
Large reverse saturable absorption (RSA) at sunlight power level was observed from a host-guest amorphous material composed of d12-coronene as a guest and β-estradiol as a rigid amorphous host. Large highly symmetric two dimensional (2D) aromatic structure of d12-coronene doped into the rigid host causes ultralong triplet lifetime as well as high triplet yield, serving efficient accumulation of the triplet excitons of d12-coronene under weak excitation light. The high absorption coefficient of the triplet state (σ34) compared with that of the ground state (σ01) for d12-coronene is also caused by the highly symmetric 2D aromatic structure. The efficient accumulation of the triplet excitons and high σ34/σ01 led to an onset of the RSA characteristics under irradiance below 10-1 mW cm-2. An film of the amorphous material showed a large decrease of transmittance from 66% at 0.02 mW cm-2 to 24% at 50 mW cm-2 for continuous light at 405 nm.
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Report
(4 results)
Research Products
(45 results)
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[Journal Article] Highly efficient blue electroluminescence based on thermally activated delayed fluorescence2015
Author(s)
Shuzo Hirata, Yumi Sakai, Kensuke Masui, Hiroyuki Tanaka, Sae Youn Lee, Hiroko Nomura, Nozomi Nakamura, Mao Yasumatsu, Hajime Nakanotani, Qisheng Zhang, Katsuyuki Shizu, Hiroshi Miyazaki, Chihaya Adachi
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Journal Title
Nat. Mater.
Volume: 14
Issue: 3
Pages: 330-336
DOI
Related Report
Peer Reviewed
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