White electrophosphorescent devices based on tricolour emissive layers

Wang, Y; Hua, Y; Wu, X; Zhang, G; Hui, J; Zhang, L; Liu, Q; Ma, L; Yin, S; Petty, MC

Abstract

We demonstrate high efficiency, white organic light-emitting devices based on a structure using multiple emissive layers and fabricated without a hole-injecting layer. 2,5,8,11-tetra-tertbutylperylene (TBPe) was used as the blue fluorescent layer and the overall device configuration was indium tin oxide (ITO)/N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)benzidine (NPB)/4,4'-N, N'-dicarbazole-biphenyl (CBP): bis[1-(phenyl) isoquinoline] iridium (III) acetylanetonate [Ir(piq)(2)(acac)]/CBP:fac-tris(2-phenylpyridine) iridium [Ir(ppy)(3)]/CBP: TBPe/2, 9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)/(8-hydroxyquinoline) aluminium (Alq(3))/LiF/Al. This structure possessed a maximum luminous efficiency of 14.2 cd A(-1) at a current density of 4 mA cm(-2) and a maximum brightness of 40 520 cd m(-2) at 25 V. The Commission Internationale de L'Eclairage coordinates changed only from (0.27, 0.38) to (0.33, 0.38), with the brightness varying from 100 to 25 640 cd m(-2), as the applied voltage was increased from 10 to 23 V.

Citation

Wang, Y., Hua, Y., Wu, X., Zhang, G., Hui, J., Zhang, L., …Petty, M. (2008). White electrophosphorescent devices based on tricolour emissive layers. Journal of Physics D: Applied Physics, 41(2),

• Journal Article Type: Article
• Publication Date: 2008-01
• Journal: Journal of Physics D: Applied Physics
• Print ISSN: 0022-3727
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 41
• Issue: 2
• Public URL: https://durham-repository.worktribe.com/output/1532284