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Multicolor Amplified Spontaneous Emissions Based on Organic Polymorphs That Undergo Excited‐State Intramolecular Proton Transfer
Author(s) -
Cheng Xiao,
Zhang Yufei,
Han Shenghua,
Li Feng,
Zhang Hongyu,
Wang Yue
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201600355
Subject(s) - intramolecular force , amplified spontaneous emission , lasing threshold , excited state , crystallization , photochemistry , phase (matter) , fluorescence , crystal (programming language) , molecule , laser , polymorphism (computer science) , intermolecular force , chemistry , materials science , crystallography , stereochemistry , optoelectronics , organic chemistry , optics , atomic physics , wavelength , biochemistry , physics , computer science , genotype , gene , programming language
Abstract Two polymorphs emitting near‐infrared ( 1 R form: α phase, λ em =702 nm, Φ f =0.41) and orange‐red fluorescence ( 1 O form: β phase, λ em =618 nm, Φ f =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.