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Highly efficient p-i-n white organic light emitting devices with tandem structure

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5 Author(s)
Ho, Meng-Huan ; Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 300, Republic of China ; Chen, Teng-Ming ; Yeh, Pu-Cheng ; Hwang, Shiao-Wen
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Highly efficient tandem p-i-n white organic light emitting devices have been fabricated. Utilizing an optical transparent bilayer with doped organic p-n junction that consists of 4,7-diphenyl-1,10-phenanthroline: 2% cesium carbonate (Cs2CO3)/N,N-bis(1-naphthyl)-N,N-diphenyl-1,1-biphenyl-4,4-diamine: 50% v/v tungsten oxide (WO3) as the connecting layer, the tandem p-i-n white device achieved an electroluminescence efficiency of 23.9 cd/A and a power efficiency of 7.8 lm/W at 20 mA/cm2 with a Commission Internationale de l’Eclairage coordinates of (0.30, 0.43). The electroluminescent color of this tandem p-i-n white organic light-emitting diode device will not change significantly with respect to drive current variation and forward viewing angle.

Published in:

Applied Physics Letters  (Volume:91 ,  Issue: 23 )

Date of Publication:

Dec 2007

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