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Large Optical Nonlinearity Induced by Singlet Fission in Pentacene Films
Author(s) -
Liu Yunlong,
Zhang Chunfeng,
Wang Rui,
Zhang Bo,
Tan Zhanao,
Wang Xiaoyong,
Xiao Min
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201501396
Subject(s) - singlet fission , pentacene , organic semiconductor , exciton , polarization (electrochemistry) , fission , optoelectronics , materials science , singlet state , multiple exciton generation , chemical physics , nonlinear optical , excited state , nonlinear system , chemistry , photochemistry , molecular physics , condensed matter physics , physics , nanotechnology , atomic physics , quantum dot , nuclear physics , quantum mechanics , layer (electronics) , neutron , thin film transistor
By creating two triplet excitons from one photo‐excited singlet exciton, singlet fission in organic semiconductors has drawn tremendous attention for its potential applications in boosting the efficiency of solar conversion. Here, we show that this carrier‐multiplication effect can also be used to dramatically improve the nonlinear optical response in organic materials. We have observed large optical nonlinearity with a magnitude of χ (3) up to 10 −9 esu in pentacene films, which is further shown to be a result of singlet fission by monitoring the temporal dynamics. The potential application of such efficient nonlinear optical response has been demonstrated with a singlet‐fission‐induced polarization rotation.