Multicolor Amplified Spontaneous Emissions Based on Organic Polymorphs That Undergo Excited‐State Intramolecular Proton Transfer. Issue 14 (24th February 2016)

• Record Type: Journal Article
• Authors: Cheng, Xiao; Zhang, Yufei; Han, Shenghua; Li, Feng; Zhang, Hongyu; Wang, Yue
• Is Part Of: Chemistry. Volume 22:Issue 14(2016)
• Page Start: 4899
• Page End: 4903
• Publication Date: 2016-02-24
• Subjects: amplified spontaneous emission -- crystal engineering -- lasing -- phase transformation -- polymorphs; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201600355
• Languages: English
• ISSNs: 0947-6539

Abstract

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. Abstract : Two organic polymorphs with near‐IR (1R: α‐phase) and orange‐red (1O: β‐phase) emissions were synthesized based on a structurally simple organic molecule that undergoes excited‐state intramolecular proton transfer. 1O can transform into the α phase accompanied with an unprecedented amplified spontaneous emmision changing in a single‐crystal to single‐crystal manner.