期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 7, 页码 1928-1932出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201712104
关键词
cocrystals; photoluminescence; photophysics; time-resolved spectroscopy
资金
- Singapore National Research Foundation through an NRF Investigatorship Award [NRF-NRFI2015-03]
- Singapore Ministry of Education via AcRF Tier 2 grant [MOE2015-T2-01-047]
- Singapore Ministry of Education via AcRF Tier 1 [RG 113/16]
- AcRF Tier 1, Singapore [RG 114/16, RG 8/16]
- Eusko Jaurlaritza [IT588-13]
- Spanish Government MINECO/FEDER [CTQ2016-80955]
- National Key Research and Development Program of China [2016 YFB1102201]
Singlet-triplet conversion in organic light-emitting materials introduces non-emissive (dark) and long-lived triplet states, which represents a significant challenge in constraining the optical properties. There have been considerable attempts at separating singlets and triplets in long-chain polymers, scavenging triplets, and quenching triplets with heavy metals; nonetheless, such triplet-induced loss cannot be fully eliminated. Herein, a new strategy of crafting a periodic molecular barrier into the pi-conjugated matrices of organic aromatic fluorophores is reported. The molecular barriers effectively block the singlet-to-triplet pathway, resulting in near-unity photoluminescence quantum efficiency (PLQE) of the organic fluorophores. The transient optical spectroscopy measurements confirm the absence of the triplet absorption. These studies provide a general approach to preventing the formation of dark triplet states in organic semiconductors and bring new opportunities for the development of advanced organic optics and photonics.
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