Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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A Study on the improvement in efficiencies of Organic-Light Emitting Devices Using the Phosphor, Ir(PPy)$_3$

인광물질 인 Ir(PPy)$_3$를 이용한 유기전기발광소자의 효율 개선에 관한 연구

  • 김준호 (홍익대학교 전기정보제어공학과) ;
  • 김윤명 (홍익대학교 전기정보제어공학과) ;
  • 구자룡 (홍익대학교 전기정보제어공학과) ;
  • 이한성 (인천대학 전기과) ;
  • 하윤경 (홍익대학교 기초과학과)
  • Published : 2001.07.01
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Abstract

The organic light-emitting devices (OLEDs) based on fluorescence have low efficiencies due to the requirement of spin-symmetry conservation. By using the phosphorescent material, the internal quantum efficiency can reach 100 %, compared to 25 % in the case of the fluorescent material. Thus, the phosphorescent OLEDs have recently been extensively studied and showed higher internal quantum efficiencies then the conventional OLEDs. In this study, we investigated the characteristics of the phosphorescent OLEDs, with the green emitting phosphor, Ir(ppy)$_3$ (tris(2-phenylpyridine)iridium). The devices with a structure of ITO/TPD/Ir(PPy)$_3$ doped in the host material/BCP/Alq$_3$/Li:Al/Al were fabricated, and its electrical and optical characteristics were studied. By changing the doping concentration of Ir(PPy)$_3$ and the host materials, we fabricated several devices and investigated the device characteristics.

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