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A Study on the Fabrication and Characteristic Analysis of Multiheterostructure White Organic Light Emitting Device

다층구조 배색 유기발전소자의 제작 및 특성 분석에 관한 연구

  • 노병규 (현대엘씨디 유기EL그룹) ;
  • 강명구 (극동정보대학 전자통신과) ;
  • 오환술 (건국대학교 정보통신대학 전자공학부)
  • Published : 2002.05.01

Abstract

In this paper, multiheterostructure white organic light-emitting device was fabricated by vacuum evaporation. The structure of white organic light-emitting device is ITO/CuPc/TPD/DPBi:DPA/$Alq_3/Alq_3$:DCJTB/BCT/$Alq_3$/Ca/Al. Three primary colors are implemented with DPVBi, Alq$_3$and DCJTB. The maximum EL wavelength of the fabricated white organic light-emitting device is 647nm. And the CIE coordinate is (0.33, 0.33) at 13 V. In the fabrication of white organic light-emitting devices with DCJTB, $Alq_3$, DPVBi, the EL spectrum has two peaks at 492nm, 647nm. Two peaks appeared because the blue light is combined with green light. The maximum wavelength of red light is not changed with applied voltage. After voltage applied, for the first time, the electrons met the holes in the red emission layer and emitted red light. And then the electrons moved to the green emission layer, and blue emission layer continuously. Finally, when all of the emission layer activated, the white light is emitted.

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