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Research

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Publication details for Professor Michael Petty

Wang, Y, Hua, Y, Wu, X, Zhang, G, Hui, J, Zhang, L, Liu, Q, Ma, L, Yin, S & Petty, MC (2008). White electrophosphorescent devices based on tricolour emissive layers. Journal of Physics D-Applied Physics 41(2): 025104.
  • Publication type: Journal Article
  • ISSN/ISBN: 0022-3727

Author(s) from Durham

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.