Transformation from Nonlasing to Lasing in Organic Solid-State through the Cocrystal Engineering

Organic semiconductor molecules that ideally suitable for being used to achieve solid-state lasers (OSSLs) in aggregate-state cannot actually act as the efficient laser gain materials due to varieties of nonradiative pathways, which consume the energy of excited state. Herein, we elaborately utilize...

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Bibliographic Details
Published in:ACS photonics 2019-07, Vol.6 (7), p.1798-1803
Main Authors: Yu, Yue, Li, Zhi-Zhou, Wu, Jun-Jie, Wei, Guo-Qing, Tao, Yi-Chen, Pan, Mao-Lin, Wang, Xue-Dong, Liao, Liang-Sheng
Format: Article
Language:English
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Summary:Organic semiconductor molecules that ideally suitable for being used to achieve solid-state lasers (OSSLs) in aggregate-state cannot actually act as the efficient laser gain materials due to varieties of nonradiative pathways, which consume the energy of excited state. Herein, we elaborately utilized a “cocrystal” approach to achieve the transformation of 1,4-bis­(2-cyanostyryl)­benzene (o-BCB) microcrystals from nonlasing to lasing. The tightly packed o-BCB molecules in the crystal leads to the formation of excimer state, hindering the population inversion even at the maximum tolerable pump density of 20.2 μJ/cm2. Impressively, the formation of the o-BCB-4-bromo-2,3,5,6-tetrafluorobenzoic acid (BFC) cocrystal eliminates the excimer and then forms the pure four-level energy system, which contributes to the occurrence of the room-temperature blue lasing at 450 nm with a threshold of 4.4 μJ/cm2. Our demonstration proves that this cocrystal engineering strategy can extend the molecular system for OSSLs.
ISSN:2330-4022
2330-4022
DOI:10.1021/acsphotonics.9b00606