Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Emission Characteristics of White Organic Light-Emitting Diodes Using Micro Lens Array Film

Micro Lens Array Film을 이용한 백색 OLED의 발광 특성

  • Chun, Hyun-Dong (Department of Advanced Materials Science & Engineering, Daejin University) ;
  • Na, Hyunseok (Department of Advanced Materials Science & Engineering, Daejin University) ;
  • Yang, Jae-Woong (Department of Advanced Materials Science & Engineering, Daejin University) ;
  • Ju, Sung-Hoo (Department of Advanced Materials Science & Engineering, Daejin University)
  • 천현동 (대진대학교 신소재공학과) ;
  • 나현석 (대진대학교 신소재공학과) ;
  • 양재웅 (대진대학교 신소재공학과) ;
  • 주성후 (대진대학교 신소재공학과)
  • Received : 2013.04.16
  • Accepted : 2013.04.29
  • Published : 2013.04.30
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Abstract

We studied the emission characteristics of white phosphorescent organic light-emitting diodes (PHOLEDs), which were fabricated using a two-wavelength method. To optimize emission characteristics of white PHOLEDs, white PHOLEDs with co-doping and blue/co-doping emitting layer (EML) structures were fabricated using a host-dopant system. The total thickness of light-emitting layer was 25 nm and the dopant of blue and red was FIrpic and $Bt_2Ir(acac)$ in UGH3, respectively. In case of co-doping structure, applying micro lens array film showed efficiency improvement from the current efficiency 78.5 cd/A and power efficiency 40.4 lm/W to the current efficiency 131.1 cd/A and power efficiency 65 lm/W and blue / co-doping structure showed efficiency improvement from the current efficiency 43.8 cd/A and power efficiency 22 lm/W to the current efficiency 69 cd/A and power efficiency 32 lm/W.

Keywords

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