High-Brightness White Organic Light-Emitting Diodes Featuring a Single Emission Layer
High-Brightness White Organic Light-Emitting Diodes Featuring a Single Emission Layer
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DOI：
10.1149/1.3005990
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发表时间：
2009-01-01
影响因子：
3.9
通讯作者：
Chen, Yi-Fan
中科院分区：
文献类型：
--
作者：
Chang, Mei-Ying;Wu, Chun-Chih;Chen, Yi-Fan
We have developed high-brightness, color-stable, broad-spectrum white organic light-emitting diodes featuring a single emission layer comprising a green light-emitting host material [1,3,5-tris(1-pyrenyl)benzene (TPB3)], which has a large bandgap, doped with red [4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB)], and blue [di(4-fluorophenyl)amino-di(styryl)biphenyl (DSB)] dyes. A device having the simple configuration indium tin oxide/N,N-'-bis(1-naphthyl)-N,N-'-diphenyl-1,1(')-biphenyl-4,4(')-diamine (NPB) (65 nm)/TPB3:0.6% DCJTB:6% DSB (40 nm)/tris(8-hydroxy-quinoline)aluminum (Alq(3)) (30 nm)/LiF (0.8 nm)/Al (200 nm) exhibited a broad-spectrum white emission with a maximum luminance at 15 V of 95,200 cd/m(2), a maximum current efficiency of 7.47 cd/A at 10 V, a maximum power efficiency of 4.06 lm/W at 4 V, and a maximum external quantum efficiency of 3.08% at 10 V. The Commission Internationale de l'Eclairage coordinates of (0.34, 0.39) changed only slightly over a large range of potentials (7.5-15 V). We attribute the high brightness and color-stability of this system to the strong electroluminescence of the host and the dopants, the relatively high energy-transfer efficiency from the host to the red dopant, effective carrier-direct-recombination on the blue dopant, and the confinement of the charge recombination zone within a single layer.
