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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White organic light-emitting diodes with various spacers inserted between blue and red emissive layers

Spacer에 따른 백색 유기 전기 발광 소자의 전기적 특성에 관한 연구

  • 박정현 (홍익대학교, 정보디스플레이공학과) ;
  • 이석재 (홍익대학교, 정보디스플레이공학과) ;
  • 김구영 (홍익대학교, 정보디스플레이공학과) ;
  • 서지현 (홍익대학교, 정보디스플레이공학과) ;
  • 서지훈 (홍익대학교, 정보디스플레이공학과) ;
  • 윤승수 (성균관대학교 화학과) ;
  • 이승희 (홍익대학교, 화학시스템공학과) ;
  • 김영관 (홍익대학교, 정보디스플레이공학과)
  • Published : 2007.11.01
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Abstract

High-efficiency white organic light-emitting diodes (WOLEDs) were fabricated with two emissive layers and a spacer was sandwiched between two phosphorescent dyes which were, bis(3,5-Difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III (FIrpic) as the blue emission and bis(5-acetyl-2-phenylpyridinato-N,C2') acetylacetonate $((acppy)_2Ir(acac))$ as the red emission. This spacer effectively prevented a triple-triple energy transfer between the two phosphorescent emissive layers with blue and red emission that was showed a improved lifetime. The white device showed Commission Internationale De L'Eclairage $(CIE_{x,y})$ coordinates of (0.33, 0.42) at $22400\;cd/m^2$, a maximum luminance of $27300\;cd/m^2\;at\;0.388\;mA/cm^2$, and a maximum luminous efficiency of 26.9 cd/A.

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