作者
Brendan D Folie, Jonah B Haber, Sivan Refaely-Abramson, Jeffrey B Neaton, Naomi S Ginsberg
发表日期
2018/2/14
期刊
Journal of the American Chemical Society
卷号
140
期号
6
页码范围
2326-2335
出版商
American Chemical Society
简介
Singlet fission is the spin-conserving process by which a singlet exciton splits into two triplet excitons. Singlet fission occurs via a correlated triplet pair intermediate, but direct evidence of this state has been scant, and in films of TIPS-pentacene, a small molecule organic semiconductor, even the rate of fission has been unclear. We use polarization-resolved transient absorption microscopy on individual crystalline domains of TIPS-pentacene to establish the fission rate and demonstrate that the initially created triplets remain bound for a surprisingly long time, hundreds of picoseconds, before separating. Furthermore, using a broadband probe, we show that it is possible to determine absorbance spectra of individual excited species in a crystalline solid. We find that triplet interactions perturb the absorbance, and provide evidence that triplet interaction and binding could be caused by the π-stacked geometry …
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BD Folie, JB Haber, S Refaely-Abramson, JB Neaton… - Journal of the American Chemical Society, 2018