Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 22, Pages 6449-6453Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201800762
Keywords
aggregation-induced emission; persistent mechanoluminescence; phosphorescence; white-light emission
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Funding
- National Natural Science Foundation of China [51603233, 51203054]
- Pearl River S&T Nova Program of Guangzhou [201806010125]
- Education Department [2016KTSCX027]
- Natural Science Foundation of Guangdong Province of China [2017A030313318]
- Research Start-up Funds for Outstanding Young Scholars of South China Normal University [S82140, S81330]
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Persistent luminescence from purely organic materials is basically triggered by light and electricity, which largely confines its practical applications. A purely organic AIEgen exhibits not only persistent photoluminescence, but also transient and persistent room-temperature mechanoluminescence. By simply turning on and off a UV lamp, tricolor emission switching between blue, white, and yellow was achieved. The data from single-crystal structure analysis and theoretical calculation suggest that mechanism of the observed persistent mechanoluminescence (pML) is correlated with the strong spin-orbit coupling of the bromine atom, as well as the formation of H-aggregates and restriction of intramolecular motions in noncentrosymmetric crystal structure. These results outline a fundamental principle for the development of new pML materials, providing an important step forward in expanding the application scope of persistent luminescence.
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