期刊
CELL REPORTS PHYSICAL SCIENCE
卷 3, 期 2, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.xcrp.2021.100733
关键词
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类别
资金
- National Natural Science Foundation of China [21788102, 51620105009]
- Natural Science Foundation of Guangdong Province [2019B030301003]
- Innovation and Technology Commission [ITCCNERC14SC01]
This study developed two blue luminescent molecules with aggregation-induced delayed fluorescence (AIDF) characteristics and high photoluminescence quantum yields. Efficient blue organic light-emitting diodes were fabricated based on these molecules. The molecules exhibit mechanochromic luminescence behavior and have good application potentials in various optical and electronic devices.
Aggregation-induced delayed fluorescence (AIDF) materials combining the advantages of aggregation-induced emission and thermally activated delayed fluorescence have attracted considerable attention. However, blue AIDF materials with satisfactory electroluminescence efficiencies are still few. In this work, two blue luminescent molecules (XT-DPDBA and XT-BDPDBA) with evident AIDF characteristics and high photoluminescence quantum yields are developed by using rigid electron acceptor xanthenone and weak electron donor 10-dihydrodibenzo[b,e][1,4]azasiline. Both molecules exhibit prominent mechanochromic luminescence (MCL) behaviors originating from conformational interconversion between quasi-axial and quasi-equatorial conformations. The quasi-equatorial conformation has small singlet-triplet energy splitting and thus delayed fluorescence characteristic. Efficient blue organic light-emitting diodes are fabricated based on both molecules, providing high external quantum efficiencies of up to 27% and small efficiency roll-offs. These blue AIDF molecules with MCL property have good application potentials in various optical and electronic devices.
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