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Published on: December 27, 2018
Multicolor Amplified Spontaneous Emissions Based on Organic Polymorphs That Undergo Excited-State Intramolecular
Xiao Cheng1, Yufei Zhang1, Shenghua Han1
1State Key Laboratory of Supramolecular Structures and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun, P. R. China.
Abstract:
Two polymorphs emitting near-infrared (1 R form: α phase, λem =702 nm, Φf =0.41) and orange-red fluorescence (1 O form: β phase, λem =618 nm, Φf =0.05) were synthesized by finely controlling the crystallization conditions of compound 1, a structurally simple excited-state intramolecular proton transfer (ESIPT)-active molecule. Multicolor amplified spontaneous emissions (ASEs) were realized, for the first time, based on these polymorphs. Notably, the 1 O crystal underwent heating-induced phase transformation from the β phase to the α form in a single-crystal to single-crystal (SCSC) manner accompanied with an unprecedented ASE changing. The ASE behavior of polymorphs 1 R, 1 O as well as the ASE changing during SCSC was investigated. The feasibility of multicolor lasing based on the present organic polymorphs was confirmed, which may provide a new development strategy for organic laser science and technology.
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