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2019_EJRNL_PP_Chen_Co_1.pdf
PUBLIC Latifa Noor

Phosphorescence/fluorescence hybrid white organiclight-emitting diodes (OLEDs) are highly appealing for solid-statelighting. One major challenge is how to fully utilize the electricallygenerated excitons for light output. Herein, an efficient strategy torealize full exciton radiation is successfully revealed by a judiciousmolecular design and suitable device engineering. A blue host emitterTP-PPI is designed and synthesized, exhibiting a near 100%photoluminescence quantum yield and a high triplet energy level,enabling high-performance bluefluorescence and sensitization of ayellow phosphorescent dopant. Full exciton radiation in hybrid whiteOLEDs is demonstrated with a single emitting layer formed by doping ayellow phosphor (PO-01) into TP-PPI. Near 100% exciton utilizationand state-of-the-art external quantum efficiency of 27.5% are achieved with the high-efficiency blue-emitting host and anelectron-trap engineered device architecture.