Browsing by Author "Su, Jian-Hua"

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Hybrid white organic light-emitting devices based on phosphorescent iridium-benzotriazole orange-red and fluorescent blue emitters
(2013-03-01)
Xia, Zhen-Yuan
;
Su, Jian-Hua
;
Chang, Chi-Sheng
;
Chen, Chin H.
;
友訊交大聯合研發中心
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.
Low driving voltage and efficient orange-red phosphorescent organic light-emitting devices based on a benzotriazole iridium complex
(2009-09-01)
Xia, Zhen-Yuan
;
Xiao, Xiao
;
Su, Jian-Hua
;
Chang, Chi-Sheng
;
Chen, Chin H.
Efficient orange-red phosphorescent organic light-emitting devices (PHOLED) with various doping concentrations of benzotriazole-iridium complex [(TBT)(2)Ir(acac)] (bis[4-(2H-benzotriazol-2-yl)-N,N-wdiphenyl-aniline-N(1),C(3)] iridium acetylacetonate) in 4,4'-N,N'-di(carbazolyl) biphenyl (CBP) host were fabricated. The sterically hindered iridium ligands alleviate self-quenching of the phosphorescence at high doping levels. Under the optimal doping concentration of 20 wt.%, the maximum external quantum efficiency (EQE), luminance and power yield reach 9.06%, 15.81 cd/A and 13.8 Im/W, respectively. Increasing the doping concentration from 5% to 30 wt.% significantly decreases the driving voltage. The driving voltage of 30% (TBT)(2)Ir(acac) doped device is only 3.16V at 1 mA/cm(2) with power yield of 13.32 lm/W. (C) 2009 Elsevier B.V. All rights reserved.