| 光谱学与光谱分析 |
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| Effects of Hole-Injection Layers on the Performance of Blue Organic Light-Emitting Diodes |
| GAO Li-yan, ZHAO Su-ling*, XU Zheng, ZHANG Fu-jun, SUN Qin-jun, ZHANG Tian-hui, KONG Chao |
| Key Laboratory of Luminescence and Optical Information, Ministry of Education，Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044，China |
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Abstract The present work investigates the effects of different buffer layers on the performance of blue organic light-emitting diodes (OLEDs), and compares them with the device with no buffer layer. Two kinds of blue OLEDs with 4,4’-bis(2,2’-diphenyl vinyl)-1,1’-biphenyl (DPVBi) as the emitting layer, N,N’-bis-(1-naphthyl)-N,N’-1-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) as the hole transporting layer, and copper phthalocyanine (CuPc) and poly(3,4-ethylenedioxythiophene)∶poly(styrenesulphonate) PEDOT∶PSS as the hole injection layer respectively were fabricated with the structures of ITO/CuPc/NPB/DPVBi/BCP/Alq3/Al and ITO/PEDOT∶PSS/NPB/DPVBi/BCP/Alq3/Al. Moreover, the effects of different preparation technology of CuPc on the performance of OLEDs were also investigated. It was found that the performance of the devices with a hole injection layer is better than that of the device without any hole-injection layer. Although the luminance and efficiency of the water-soluble CuPc based device are worse than that of the device with thermally evaporated CuPc, but better than that of the device with water-soluble PEDOT∶PSS. So the water-soluble CuPc is a good hole injection material because it is easier to fabricate the film than traditional CuPc.
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Received: 2010-06-08
Accepted: 2010-09-16
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Corresponding Authors:
ZHAO Su-ling
E-mail: slzhao@bjtu.edu.cn
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