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The feasible application of low-cost Al/Cu bimetal semitransparent cathode in top-emitting organic light-emitting diode

XIAO-WEN ZHANG1,2,* , XUE-YIN JIANG3, HUA WANG1,2, XIN-YU LIU1,2, HUA-RUI XU1,2, ZHI-LIN ZHANG3

Affiliation

  1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China
  2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China
  3. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, People’s Republic of China

Abstract

Efficient top-emitting organic light-emitting diode (TOLED) using low-cost Al/Cu semitransparent cathode was demonstrated. With tris(8-hydroquinoline) aluminum as emitting and electron-transport layer, the maximum luminous efficiency reached 5.1 cd/A which is almost equal to that (5.5 cd/A) of TOLED with conventional Al/Ag semitransparent cathode. Moreover, the TOLED with Al/Cu semitransparent cathode exhibited weak microcavity effect, owing to the low reflectance of Al/Cu and therein reduced multiple-beam interference within the device. In comparison with Al/Ag bimetal semitransparent cathode, Al/Cu showed rather flat transmittance spectrum and caused less leakage current, which would further improve device performance..

Keywords

OLED, Top-emitting, Microcavity, Semitransparent cathode.

Submitted at: March 14, 2011
Accepted at: April 11, 2011

Citation

XIAO-WEN ZHANG, XUE-YIN JIANG, HUA WANG, XIN-YU LIU, HUA-RUI XU, ZHI-LIN ZHANG, The feasible application of low-cost Al/Cu bimetal semitransparent cathode in top-emitting organic light-emitting diode, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 4, pp. 338-342 (2011)