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Singlet Excitons: High Yields of Singlet Excitons in Organic Electroluminescence through Two Paths of Cold and Hot Excitons (Advanced Optical Materials 6/2014)
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.201470034
Subject(s) - exciton , singlet state , intersystem crossing , electroluminescence , materials science , singlet fission , biexciton , molecular physics , condensed matter physics , atomic physics , physics , nanotechnology , excited state , layer (electronics)
The initial ratio between the singlet (pink balls) and triplet (blue balls) excitons should be 1:3 according to spin statistics. On page 510, B. Yang, Y. Ma, and co‐workers describe how a very small singlet–triplet energy split between S 2 and T 2 with a dominant charge‐transfer character and a large energy gap between T 1 and T 2 could cause reverse intersystem crossing along the ‘hot exciton’ charge‐transfer state channel of T 2 →S 2 , resulting in a high singlet exciton ratio of >25%.