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Organic Crystals with Near‐Infrared Amplified Spontaneous Emissions Based on 2′‐Hydroxychalcone Derivatives: Subtle Structure Modification but Great Property Change
Author(s) -
Cheng Xiao,
Wang Kai,
Huang Shuo,
Zhang Houyu,
Zhang Hongyu,
Wang Yue
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201503914
Subject(s) - fluorescence , luminescence , condensation , infrared , materials science , quantum yield , crystal (programming language) , yield (engineering) , aggregation induced emission , photochemistry , chemistry , optoelectronics , optics , thermodynamics , physics , computer science , metallurgy , programming language
A series of highly efficient deep red to near‐infrared (NIR) emissive organic crystals 1 – 3 based on the structurally simple 2′‐hydroxychalcone derivatives were synthesized through a simple one‐step condensation reaction. Crystal 1 displays the highest quantum yield ( Φ f ) of 0.32 among the reported organic single crystals with an emission maximum ( λ em ) over 710 nm. Comparison between the bright emissive crystals 1 – 3 and the nearly nonluminous compounds 4 – 7 clearly gives evidence that a subtle structure modification can arouse great property changes, which is instructive in designing new high‐efficiency organic luminescent materials. Notably, crystals 1 – 3 exhibit amplified spontaneous emissions (ASE) with extremely low thresholds. Thus, organic deep red to NIR emissive crystals with very high Φ f have been obtained and are found to display the first example of NIR fluorescent crystal ASE.