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High-efficiency and color-stable white organic light-emitting devices based on sky blue electrofluorescence and orange electrophosphorescence
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Highly efficient and color-stable two-wavelength white organic light-emitting devices (WOLEDs) combining an orange phosphor and a sky blue fluorescent dye BUBD-1 are fabricated where the host singlet is resonant with the fluorophore singlet state and the host triplet is resonant with the phosphor triplet level. A thin layer of 1,3,5-tris[-(phenyl)benzimidazole]benzene between the phosphorescent and the fluorescent regions confines both singlet and triplet excitons efficiently and suppress Dexter transfer of the phosphorexcitons to the nonradiative triplet state of BUBD-1. The best device reaches peak efficiencies of and which are superior to common two-color all-fluorescent or all-phosphor WOLEDs.
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