Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 12, Pages 11691-11698Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b01105
Keywords
bipolar blue fluorophore; unity quantum yield; electron trap engineering; hybrid white OLED; full exciton radiation
Funding
- Natural Science Foundation of China [51673113]
- National Key R&D Program of China [2016YFB0401002]
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Phosphorescence/fluorescence hybrid white organic light-emitting diodes (OLEDs) are highly appealing for solid-state lighting. One major challenge is how to fully utilize the electrically generated excitons for light output. Herein, an efficient strategy to realize full exciton radiation is successfully revealed by a judicious molecular design and suitable device engineering. A blue host emitter TP-PPI is designed and synthesized, exhibiting a near 100% photoluminescence quantum yield and a high triplet energy level, enabling high-performance blue fluorescence and sensitization of a yellow phosphorescent dopant. Full exciton radiation in hybrid white OLEDs is demonstrated with a single emitting layer formed by doping a yellow phosphor (PO-01) into TP-PPI. Near 100% exciton utilization and state-of-the-art external quantum efficiency of 27.5% are achieved with the high-efficiency blue-emitting host and an electron-trap engineered device architecture.
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