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International Journal of Photoenergy
Volume 2014 (2014), Article ID 319390, 6 pages
http://dx.doi.org/10.1155/2014/319390
Research Article

Top-Emission Organic Light Emitting Diode Fabrication Using High Dissipation Graphite Substrate

1 Master of Electro-Optical and Materials Science, National Formosa University, Yunlin 632, Taiwan
2Department of Multimedia and Game Science, Chung Chou University of Science and Technology, Changhua 51003, Taiwan

Received 14 March 2014; Revised 14 May 2014; Accepted 22 May 2014; Published 2 July 2014

Academic Editor: K. R. Justin Thomas

Copyright © 2014 Yu-Sheng Tsai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study uses a synthetic graphite fiber as the heat dissipation substrate for top-emission organic light emitting diode (TEOLED) to reduce the impact from joule heat. UV glue (YCD91) was spin coated onto the substrate as the insulation layer. The TEOLED structure is (glass; copper; graphite) substrate/YCD91 glue/Al/Au/EHI608/TAPC/Alq3/LiF/Al/Ag. The proposed graphite fiber substrate presents better luminous performance compared with glass and copper substrate devices with luminance of 3055 cd/m2 and current efficiency of 6.11 cd/A at 50 mA/cm2. When lighting period of different substrates TEOLED, the substrate case back temperature was observed using different lighting periods. A glass substrate element operating from 5 to 25 seconds at 3000 cd/m2 luminance produced a temperature rate of 1.207°C/sec. Under 4000 cd/m2 luminance the copper and graphite substrate temperature rates were 0.125°C/sec and 0.088°C/sec. Graphite component lifetime was determined to be 1.875 times higher than the glass components and 1.125 times higher than that of copper.