한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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Highly Efficient Blue Organic Light-emitting Devices Based on Copper Phthalocyanine/Aromatic Diamine Composite Hole Transport Layer

  • Liao, Chi Hung (Dept. of Applied Chemistry, National of Chiao Tung University) ;
  • Tsai, Chih Hung (Dept. of Applied Chemistry, National of Chiao Tung University) ;
  • Chen, Chin H. (Dept. of Photonics & Display Institute, National of Chiao Tung University)
  • Published : 2004.08.23
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Abstract

Highly efficient blue organic light-emitting devices (OLEDs) utilizing the idea of copper phthalocyanine (CuPc)/N,N'-bis-(1-naphthyl)-N,N'-diphenyl,1,1'-biphenyl- 4,4'-diamine (NPB) composite hole transport layer (CPHTL) have been fabricated. The effect of inserting CPHTL upon the performance of blue OLEDs with 2-methyl-9,10-di(2-naphthyl)anthracene (MADN) as the blue emitter has been investigated. Compared with the luminous efficiency of the standard blue device without CPHTL (1.33 cd/A), that of the device with 40:60 CuPc/NPB CPHTL has been increased by more than twice up to 2.96 cd/A with a Commission Internationale d'Eclairage (CIE) coordinates of(x = 0.15, y = 0.10) and a power efficiency of 1.46 lm/W (20 mA/$cm^2$) at 6.39 V. The increased device efficiency is attributed to an improved balance between hole and electron currents arriving at the recombination zone.

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