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International Journal of Photoenergy
Volume 2014, Article ID 851371, 6 pages
http://dx.doi.org/10.1155/2014/851371
Research Article

Enabling Lambertian-Like Warm White Organic Light-Emitting Diodes with a Yellow Phosphor Embedded Flexible Film

1Green Energy and Environment Research Laboratories, Industrial Technology Research Institute (ITRI), 195, Section 4, Chung Hsing Road, Chutung 31040, Taiwan
2Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
3Institute of Photonic System, National Chiao Tung University, Tainan 711, Taiwan
4Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan

Received 14 March 2014; Revised 26 May 2014; Accepted 17 June 2014; Published 16 July 2014

Academic Editor: Liang-Sheng Liao

Copyright © 2014 Cheng-Chang Chen 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

We demonstrate in this report a new constructive method of fabricating white organic light-emitting devices (OLEDs) with a flexible plastic film embedded with yellow phosphor. The flexible film is composed of polydimethylsiloxane (PDMS) and fabricated by using spin coating followed by peeling technology. From the results, the resultant electroluminescent spectrum shows the white OLED to have chromatic coordinates of 0.38 and 0.54 and correlated color temperature of 4200 K. The warm white OLED exhibits the yield of 10.3 cd/A and the luminous power efficiency of 5.4 lm/W at a luminance of 1000 cd/m2. A desirable Lambertian-like far-field pattern is detected from the white OLEDs with the yellow phosphor containing PDMS film. This method is simple, reproducible, and cost-effective, proving to be a highly feasible approach to realize white OLED.