Efficiency and Color Coordinate Improvement Using Codopants in Blue Organic Light-Emitting Diode
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概要
- 論文の詳細を見る
The codoping method is applied to fabricate efficient blue organic light-emitting diodes (OLEDs). With the same structure of indium–tin oxide (ITO)/N,N$'$-bis(1-naphthyl)-N,N$'$-diphenyl-1,1$'$-biphenyl-4,4$'$diamine (NPB)(80 nm)/light-emitting layer (30 nm)/tris-(8-hydroxy-quinoline)aluminum (Alq3) (20 nm)/LiF (1 nm)/Al (120 nm), a set of three devices was manufactured for comparison. For Devices 1, 2, and 3, the light-emitting layers are 9,10-di(2-naphthyl)anthracene (ADN):4,4$'$-(1,4-phenylenedi-2,1-ethene diyl)bis[N,N-bis(4-methylphenyl)-benzenamine] (DPAVB) (1 wt %), ADN:2,5,8,11-tetra-($t$-butyl)-perylene (TBPE) (1 wt %), and ADN:DPAVB (0.3 wt %):TBPE (0.7 wt %), respectively. It is found that the codoped Device 3 has the highest maximum luminance, Electroluminescence (EL) quantum efficiency and color saturation. Further study on the effect of the codopants was through a relative photoluminescence (PL) quantum efficiency measurement. The result shows that the relative PL efficiencies of Devices 1, 2, and 3 are 15.6, 19.3, and 24%, respectively, as determined using an integrating sphere system excited at 375 nm. The codoping method improves the EL efficiency intrinsically. Codopants of the heterogeneous light-emitting molecules may decrease the possibility of self-quenching from the interaction of the homogenous molecules at the same total doping concentration. Furthermore, the decrease in the interaction of homogenous molecules suppresses the light emission from the aggregations thus narrowing the emission spectrum, and results in saturated blue light emission.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-12-15
著者
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You Han
Changchun Institute Of Applied Chemistry Chinese Academy Of Sciences
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Chen Jiang
Changchun Institute Of Applied Chemistry Chinese Academy Of Sciences
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Ma Dong
Changchun Institute Of Applied Chemistry Chinese Academy Of Sciences
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Sun Run
Key Laboratory Of Advanced Displays And System Application Shanghai University
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Wang Xiu
Key Laboratory of Advanced Displays and System Application, Shanghai University, Jiading, Shanghai 201800, China
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Chen Jiang
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
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Ma Dong
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
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Sun Run
Key Laboratory of Advanced Displays and System Application, Shanghai University, Jiading, Shanghai 201800, China
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You Han
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China