Hybrid white organic light-emitting devices based on phosphorescent iridium-benzotriazole orange-red and fluorescent blue emitters

Abstract

We demonstrate that high color purity or efficiency hybrid white organic light-emitting devices (OLEDs) can be generated by integrating a phosphorescent orange-red emitter, bis[4-(2H-benzotriazol-2-yl)-N,N-diphenyl-aniline-N-1,C-3] iridium acetylacetonate, Ir(TBT)(2)(acac) with fluorescent blue emitters in two different emissive layers. The device based on deep blue fluorescent material diphenyl-[4-(2-[1,1';4',1 '']terphenyl-4-yl-vinyl)-phenyl]-amine BpSAB and Ir(TBT)(2)(acac) shows pure white color with the Commission Internationale de L'Eclairage (CIE) coordinates of (0.33,0.30). When using sky-blue fluorescent dopant N,N'-(4,4'-(1E,1'E)-2,2'-(1,4-phenylene)bis(ethene-2,1-diy)bis(4,1-phenylene))-bis(2-ethyl-6-methyl-N-phenylaniline) (BUBD-1) and orange-red phosphor with a color-tuning phosphorescent material fac-tris(2-phenylpyridine) iridium (Ir(ppy)(3)), it exhibits peak luminance yield and power efficiency of 17.4 cd/A and 10.7 lm/W, respectively with yellow-white color and CIE color rendering index (CRI) value of 73. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.