High-efficiency and color-stable white organic light-emitting devices based on sky blue electrofluorescence and orange electrophosphorescence

Cheuk Lam HO, Mei Fang Lin, Wai Yeung WONG*, Rick W K WONG, Chin H. Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

113 Citations (Scopus)

Abstract

Highly efficient and color-stable two-wavelength white organic light-emitting devices (WOLEDs) combining an orange phosphor [Ir (Cz-C F3)] 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 [N -(phenyl)benzimidazole]benzene between the phosphorescent and the fluorescent regions confines both singlet and triplet excitons efficiently and suppress Dexter transfer of the phosphor excitons to the nonradiative triplet state of BUBD-1. The best device reaches peak efficiencies of 19.3 cdA and 11.1 lmW which are superior to common two-color all-fluorescent or all-phosphor WOLEDs.

Original languageEnglish
Article number083301
JournalApplied Physics Letters
Volume92
Issue number8
DOIs
Publication statusPublished - 2008

Scopus Subject Areas

  • Physics and Astronomy (miscellaneous)

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