Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Study on the Improved Quantum Efficiency of the PVK:Bu-PBD:C6 Single Layer Green Light Emitting Devices

PVK:Bu-PBD:C6 단일층 녹색발광소자의 양자효율 개선에 관한 연구

  • 조재영 (건국대학교 전자·정보통신학과) ;
  • 노병규 (건국대학교 전자·정보통신학과) ;
  • 오환술 (건국대학교 전자·정보통신학과)
  • Published : 2001.11.01
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Abstract

Single-layer green ELs was fabricated with using molecularly-dispersed Bu-PBD into poly-N-vinylcarbazole(PVK) which has low operating voltage and high quantum efficiency. A EL cell structure of glass substrate/indium-tin-oxide/PVK:Bu-PBD:C6(∼ 100nm)/Ca(20nm)/Al(20nm) was employed with variable doping concentration. The keys to obtain high quantum efficiency was excellent film forming capability of molecularly dispersed into PVK and appropriate combination of cathode for avoiding exciplex. We obtained the turn-on voltage of 4.2V and quantum efficiency of 0.52% at 0.lmol% of C6 concentration which has been improved about a factor of 50 in comparison with the undoped cell. The PL peak wavelengths wouldn\`t be turned by changing the concentration of the C6 dopant. Green EL emission peak and FWHM were 520nm and 70nm respectively. PL emission peak was obtained at 495nm.

Keywords

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