Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 40, Pages 14140-14145Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201907572
Keywords
crystal engineering; fluorescence; noncovalent interactions; phosphorescence; solid-state structures
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Funding
- National Natural Science Foundation of China [21875104, 51673095, 91833304, 91833302]
- National Basic Research Program of China (973 Program) [2015CB932200]
- Natural Science Fund for Distinguished Young Scholars of Jiangsu Province [BK20180037]
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Provided here is evidence showing that the stacking between triplet chromophores plays a critical role in ultralong organic phosphorescence (UOP) generation within a crystal. By varying the structure of a functional unit, and different on-off UOP behavior was observed for each structure. Remarkably, 24CPhCz, having the strongest intermolecular interaction between carbazole units exhibited the most impressive UOP with a long lifetime of 1.06 s and a phosphorescence quantum yield of 2.5 %. 34CPhCz showed dual-emission UOP and thermally activated delayed fluorescence (TADF) with a moderately decreased phosphorescence lifetime of 770 ms, while 35CPhCz only displayed TADF owing to the absence of strong electronic coupling between triplet chromophores. This study provides an explanation for UOP generation in crystal and new guidelines for obtaining UOP materials.
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