Highly Efficient White Organic Light-Emitting Diodes with a p--i--n Tandem Structure

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概要

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• In this study, we demonstrate the fabrication of highly efficient white organic light-emitting diodes (WOLEDs) with a p--i--n tandem structure using lithium (Li)-doped tris(8-hydroxyquinoline) aluminum (Alq3)/molybdenum oxide (MoOx)-doped 4,4$'$,4$''$-tris[2-naphthyl(phenyl)amino] triphenylamine (2-TNATA) as an effective interconnecting layer (ICL). The tandem device exhibited a luminance of 3800 cd/m2, a luminous efficiency of 18.8 cd/A, a power efficiency of 5.48 lm/W, an external quantum efficiency of 6.5%, and the Commission Internationale d'Eclairage (CIE) coordinates of $(x=0.312, y=0.396)$ at 20 mA/cm2. The electroluminescence color of this p--i--n tandem device nearly did not change significantly with driving voltage variation and viewing angle. The various interfaces of ICL in such a tandem device were studied using a photovoltaic setup and were used to elucidate the mechanisms of the tandem devices.

• 2011-04-25

著者

• Yokoyama Meiso

  Department Of Electrical Engineering National Cheng Kung University

• SU Shui-Hsiang

  Department of Electronic Engineering

• HOU Cheng-Chieh

  Department of Electronic Engineering

• Wu Chung-Ta

  Department of Electronic Engineering, I-Shou University, Kaohsiung County 840, Taiwan

• Kung Chun-Hao

  Department of Electronic Engineering, I-Shou University, Kaohsiung County 840, Taiwan

• Hou Cheng-Chieh

  Department of Electronic Engineering, I-Shou University, Kaohsiung County 840, Taiwan

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