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High Yields of Singlet Excitons in Organic Electroluminescence through Two Paths of Cold and Hot Excitons
Author(s) -
Pan Yuyu,
Li Weijun,
Zhang Shitong,
Yao Liang,
Gu Cheng,
Xu Hai,
Yang Bing,
Ma Yuguang
Publication year - 2014
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201300467
Subject(s) - exciton , intersystem crossing , electroluminescence , triphenylamine , singlet state , materials science , oled , optoelectronics , engineering physics , physics , nanotechnology , atomic physics , condensed matter physics , excited state , layer (electronics)
A very high singlet exciton ratio (∼93%) in the electroluminescence of the triphenylamine‐thiadiazole molecule TPA‐NZP is attributed to reverse intersystem crossing (T→S) along the high‐lying charge‐transfer state channel, denoted the “hot exciton” mechanism. Compared with a “cold exciton” mechanism, this may be a good strategy for designing the next generation of organic light‐emitting materials with high exciton utilization efficiency and high exciton radiation efficiency.