Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 5, Issue 7, Pages 3209-3215Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1qm00155h
Keywords
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Funding
- Natural Science Foundation of China [51903159, 91833304]
- Shenzhen Science and Technology Program [KQTD20170330110107046, JCYJ20190808120419167]
- China Postdoctoral Science Foundation [2019TQ0198]
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This study designed and synthesized two red TADF emitters with horizontal orientation, among which PXZ-AQPhPy achieved a high external quantum efficiency of 19.6%, providing a simple and effective design strategy for selectively promoting the horizontal orientation of red TADF emitters.
Developing highly efficient red thermally activated delayed fluorescence (TADF) emitters remains a formidable challenge due to strict molecular design principles. In this contribution, two red emitters PXZ-AQPy and PXZ-AQPhPy with high structural rigidity and linear configurations are designed and synthesized based on phenoxazine (PXZ) as a donor and acenaphtho[1,2-b]quinoxaline (AQ) as an acceptor. Both molecules with horizontal orientation are endowed with TADF and aggregation-induced emission (AIE) properties. By elongating the acceptor segment via phenyl decoration, PXZ-AQPhPy exhibits higher horizontal ratios of the emitting dipole orientation (Theta|| = 85%), while the emission characteristics are almost unaltered. Consequently, the PXZ-AQPhPy based device achieves a high external quantum efficiency of 19.6% with an emission peak at 610 nm. This work provides a simple and effective design strategy to selectively promote the horizontal orientation of red TADF emitters.
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