期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 62, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202215071
关键词
Afterglow; Doped Polymer Films; Information Recording; Room Temperature Phosphorescence; Thermally Activated Delayed Fluorescence
Organic ultralong room temperature phosphorescence is a unique phenomenon that has gained widespread attention due to its potential applications and fundamental interest. This study demonstrates the use of two derivatives as excellent afterglow materials for red and blue-green light emission, which is attributed to persistent thermally activated delayed fluorescence and RTP.
Organic ultralong room temperature phosphorescence (RTP), or organic afterglow, is a unique phenomenon, gaining widespread attention due to its far-reaching application potential and fundamental interest. Here, two laterally expanded 9,10-dimesityl-dihydro-9,10-diboraanthracene (DBA) derivatives are demonstrated as excellent afterglow materials for red and blue-green light emission, which is traced back to persistent thermally activated delayed fluorescence and RTP. The lateral substitution of polycyclic DBA scaffold, together with weak transversal electron-donating mesityl groups, ensures the optimal molecular properties for (reverse) intersystem crossing and long-lived triplet states in a rigid poly(methyl methacrylate) matrix. The achieved afterglow emission quantum yields of up to 3 % and 15 %, afterglow lifetimes up to 0.8 s and 3.2 s and afterglow durations up to 5 s and 25 s (for red and blue-green emitters, respectively) are attributed to the properties of single molecules.
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