Journal
ADVANCED MATERIALS
Volume 30, Issue 50, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804228
Keywords
blue emission; excited state; organic light-emitting diodes; phosphine oxide; thermally activated delayed fluorescence
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Funding
- Changjiang Scholar Program of Chinese Ministry of Education [Q2016208]
- NSFC [21672056, 61605042, 21602048, 51873056]
- Science and Technology Bureau of Heilongjiang Province [JC2015002]
- Harbin Science and Technology Bureau [2015RAYXJ008]
- National Postdoctoral Program for Innovative Talents [BX201600048]
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Efficient blue emitters are indispensable for organic light-emitting diodes (OLEDs) with respect to display and lighting applications. Because of their high-energy excited states, both radiation enhancement and non-radiation suppression should be simultaneously optimized to realize 100% exciton utilization. Here, it is shown that the excited-state characteristics of blue thermally activated delayed fluorescence emitters can be precisely controlled by a secondary acceptor having moderate electronic effects on increasing the singlet charge-transfer component and preserving the triplet locally excited-state component. In addition of planar configuration between the donor and the primary acceptor, the radiative transition improvement and non-radiative transition suppression can be simultaneously achieved for full-exciton radiation. A molecule using diphenylphosphine oxide as the secondary acceptor exhibits approximate to 100% photoluminescence quantum yield on the basis of its tenfold increased singlet radiative rate constant, fivefold decreased singlet and triplet non-radiative rate constants, and approximate to 100% reverse intersystem crossing efficiency, which further endows approximate to 100% exciton utilization efficiency to its sky-blue OLEDs.
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