title: Multicolor Amplified Spontaneous Emissions Based on Organic Polymorphs That Undergo Excited-State Intramolecular Proton Transfer.
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.
authors.affiliation: State Key Laboratory of Supramolecular Structures and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun, P. R. China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Supramolecular Structures and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun, P. R. China.
authors.forename: Yufei
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Supramolecular Structures and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun, P. R. China.
authors.forename: Shenghua
authors.initials: S
authors.lastname: Han
authors.affiliation: State Key Laboratory of Supramolecular Structures and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun, P. R. China.
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.affiliation: State Key Laboratory of Supramolecular Structures and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun, P. R. China. hongyuzhang@jlu.edu.cn.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Supramolecular Structures and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun, P. R. China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
keywords: amplified spontaneous emission; crystal engineering; lasing; phase transformation; polymorphs