Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 29, Pages 8369-8373Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201503914
Keywords
amplified spontaneous emission; near-infrared spectroscopy; organic crystals; proton transfer; pi-conjugation
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Funding
- National Natural Science Foundation of China [51173067, 21221063]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT101713018]
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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 (Phi(f)) of 0.32 among the reported organic single crystals with an emission maximum (lambda(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 Phi(f) have been obtained and are found to display the first example of NIR fluorescent crystal ASE.
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