首页|Efficient red hybridized local and charge-transfer OLEDs by rational isomer engineering
Efficient red hybridized local and charge-transfer OLEDs by rational isomer engineering
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NSTL
Developing highly efficient red emitters with emission beyond 600'nm is full of challenges for organic light-emitting diodes(OLEDs).Herein,two novel red isomers of 11-DTPA-BBI and 3-DTPA-BBI manifesting hybridized local and charge-transfer(HLCT)state were designed and synthesized,based on triphenylamine(TPA)as donor and 7H-benzo[de]benzo[4,5]imidazo[2,l-a]isoquinolin-7-one(BBI)as acceptor.The charge-transfer(CT)component in HLCT state ensures their red emission and high excitons utilization,while the locally excited(LE)component guarantees the high fluorescence radiative rate.Further,the non-radiative transition is suppressed through regulating molecular vibration modes by isomer engineering,resulting in the high fluorescence quantum efficiency of 53% for 3-DTPA-BBI.Consequently,a maximum external quantum efficiency of 3.0% is achieved with emission peak at 604 nm in 3-DTPA-BBI based OLEDs.This contribution demonstrates a comprehensive structure-property relationship which may provide an effective guidance to design high performance red electroluminescent emitters.
NSTL
