Nondoped Red Fluorophores with Hybridized Local and Charge-Transfer State for High-Performance Fluorescent White Organic Light-Emitting Diodes

Two red fluorophores (TPABTPA and TPABCHO) with hybridized local and charge-transfer properties were systematically studied. TPABTPA and TPABCHO enabled nondoped organic light-emitting diodes (OLEDs) with excellent external quantum efficiency (EQE) of 11.1% and 5.0%, respectively, attributed to high...

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Published in:ACS applied materials & interfaces 2019-10, Vol.11 (42), p.39026-39034
Main Authors: Chen, Xiaojie, Yang, Zhan, Li, Wenlang, Mao, Zhu, Zhao, Juan, Zhang, Yi, Wu, Yuan-Chun, Jiao, Shibo, Liu, Yang, Chi, Zhenguo
Format: Article
Language:English
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Summary:Two red fluorophores (TPABTPA and TPABCHO) with hybridized local and charge-transfer properties were systematically studied. TPABTPA and TPABCHO enabled nondoped organic light-emitting diodes (OLEDs) with excellent external quantum efficiency (EQE) of 11.1% and 5.0%, respectively, attributed to high exciton utilization efficiency of 82% and 46%, respectively. Furthermore, TPABTPA and TPABCHO were utilized as complementary emitters for a sky-blue thermally activated delayed fluorescence material to fabricate two-color fluorescent white OLEDs (WOLEDs) in a fully nondoped emissive-layer configuration. Furthermore, device performance was optimized through a simple device engineering strategy by sandwiching a suitable interlayer between the emitting layers. As a result, the optimized TPABTPA- and TPABCHO-based WOLEDs successfully achieved high EQEs of 23.0% and 8.6%, respectively, along with a low efficiency roll-off and good spectral stability, due to high exciton utilization efficiency of the emitters and importantly efficient suppression of a nonradiative energy-transfer process.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.9b15278