Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201908568
Keywords
charge transfer exciton; exciton allocation; hydrogen bond; thermally activated delayed fluorescence; white organic light-emitting diodes
Categories
Funding
- Changjiang Scholar Program of Chinese Ministry of Education [Q2016208]
- National Natural Science Foundation of China [21672056, 61605042, 21602048, 51873056]
- Young Innovative Team Supporting Project of Heilongjiang Province
- Natural Science Foundation of Heilongjiang Province [QC2016072]
- National Postdoctoral Program for Innovative Talents [BX20180092]
- Postdoctoral Science Foundation of China [2018M6403132019]
- Education Department of Heilongjiang Province [RCCXYJ201804]
- Postdoctoral Science Foundation of Heilongjiang Province
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Despite the success of thermally activated delayed fluorescence (TADF) emitters in monochromatic organic light-emitting diodes (OLED), only few efficient full-TADF white OLEDs (WOLED) are reported because of the challenge in rational exciton allocation between blue and other color emitters. Herein, it is demonstrated that the appropriate exciton delocalization in blue TADF matrixes can simultaneously support the sufficient blue emission and the energy loss-free charge and exciton transfer to yellow TADF emitters. Through introducing steric hindrance-modulated intermolecular hydrogen bond networks, a fluorinated carbazole-phosphine oxide hybrid realizes the balance of exciton localization and delocalization, giving rise to state-of-the-art external quantum efficiency beyond 20% from its simple trilayer full-TADF WOLEDs, accompanied by excellent spectral stability. The correlation between the efficiencies of the blue TADF matrixes and their intermolecular interactions reveals that the exciton delocalization is crucial for the exciton allocation optimization in multicomponent emission systems.
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