期刊
ADVANCED OPTICAL MATERIALS
卷 8, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201902195
关键词
aggregation-induced emission; blue emission; charge-transfer state; hydrostatic pressure; organic light-emitting diodes
资金
- National Natural Science Foundation of China [21788102, 51673118, 21975077]
- Science & Technology Program of Guangzhou [201804010218, 201804020027]
- Innovation and Technology Commission of Hong Kong [ITC-CNERC14S01]
- Fundamental Research Funds for the Central Universities [2019ZD04]
- Fund of Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates [2019B030301003]
There remains an urgent demand for high-quality blue luminogens that can simultaneously achieve high photoluminescence quantum yield (PLQY) in film and high exciton utilization efficiency (EUE) in the electroluminescence (EL) process. In this study, a referable molecular design strategy is developed for blue luminogens via constructing low-lying locally excited (LE) state with an aggregation-induced emission (AIE) characteristic and high-lying charge-transfer (CT) state for the effective triplet-to-singlet conversion channel. 2TriPE-BPI-MCN with the insertion ofp-cyano ando-methyl groups is designed to compare with its matrix framework (2TriPE-BPI). They have analogous properties of the lowest singlet (S-1) states with blue emission and free of concentration quenching in film; however, 2TriPE-BPI-MCN exhibits unusual response for hydrostatic pressure owing to its S(2)state CT characteristics. Therefore, 2TriPE-BPI-MCN can harness more electrogenerated excitons than 2TriPE-BPI, resulting in a better EL performance in nondoped blue organic light-emitting diodes (OLEDs) (CIEx,y= 0.153, 0.147) with high external quantum efficiency of 4.6% and negligible efficiency roll-off. These findings could open a feasible avenue to develop high-quality blue luminogens for high-performance nondoped blue OLEDs.
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