Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 27, Pages 7997-8001Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201800834
Keywords
carbazoles; charge transfer; fluorescence; phosphorescence; small energy gap
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Funding
- Science and Technology Plan of Shenzhen [JCYJ20160509170535223, JCYJ20160229205601482, JCYJ20170818113602462]
- National Science Foundation of China [21788102]
- Research Grants Council of Hong Kong [16308016, 16305015, A-HKUST605/16, C609-17G, NHKUST604/14]
- Innovation and Technology Commission [ITC-CNERC14SC01]
- China Postdoctoral Science Foundation [2016M600680]
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Pure organic materials with ultralong room-temperature phosphorescence (RTP) are attractive alternatives to inorganic phosphors. However, they generally show inefficient intersystem crossing (ISC) owing to weak spin-orbit coupling (SOC). A design principle based on the realization of small energy gap between the lowest singlet and triplet states (Delta E-ST) and pure pi pi* configuration of the lowest triplet state (T-1) via structural isomerism was used to obtain efficient and ultralong RTP materials. The meta isomer of carbazole-substituted methyl benzoate exhibits an ultralong lifetime of 795.0 ms with a quantum yield of 2.1%. Study of the structure-property relationship shows that the varied steric and conjugation effects imposed by ester substituent at different positions are responsible for the small Delta E-ST and pure pi pi* configuration of T-1.
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