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White organic light emitting devices with hybrid emissive layers combining phosphorescence and fluorescence
- Source :
- Journal of Physics D: Applied Physics. 41:105114
- Publication Year :
- 2008
- Publisher :
- IOP Publishing, 2008.
-
Abstract
- We fabricated a white organic light-emitting diode (WOLED) by hybrid emissive layers which combined phosphorescence with fluorescence. In this device, the thin layer of 4-(dicyanomethylene)-2-(t-butyl)-6-(1, 1, 7, 7-tetramethyljulolidyl-9-enyl)-4H-pyran played the role of undoped red emissive layer which was inserted between two blue phosphorescence emissive layers. The blue phosphorescent dye was bis[(4, 6-difluorophenyl)-pyridinato-N, C2] (picolinato) Ir(III), which was doped in the host material, N, N'-dicarbazolyl-1, 4-dimethene-benzene. The WOLED showed stable Commission Internationale de L'Eclairage coordinates and a high efficency of 9.6 cd A−1 when the current density was 1.8 A m−2. The maximum luminance of the device achieved was 17 400 cd m−2 when the current density was 3000 A m−2.
Details
- ISSN :
- 13616463 and 00223727
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- Journal of Physics D: Applied Physics
- Accession number :
- edsair.doi...........c787074e4bf81fc31a4a66ed5b7f6ed0