We present an accurate analysis of light emission in top-emitting organic light-emitting devices (TOLEDs) by explicitly considering the Purcell effect. TOLEDs are optimized separately for maximum zero-degree luminance, maximum electroluminescence (EL) efficiency, and wide viewing angle with high EL efficiency. For fluorescent material with an internal quantum efficiency of 0.25, the maximum zero-degree luminance and EL efficiency can be achieved by locating the emitters around the first antinode of the microcavity while for phosphorescent material with , the maximum zero-degree luminance and EL efficiency are around the second antinode. Through relaxing the efficiency by 10%–20%, the angular intensity distribution can be even better than the Lambertian distribution; meanwhile, the color shows only a small variation over an angle range of 150°. Our results, which are in good agreement with experiments, show that the Purcell effect on TOLED performances is significant and should be carefully examined in studying TOLEDs.
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1 June 2007
Research Article|
June 12 2007
Comprehensive analysis and optimal design of top-emitting organic light-emitting devices
Xue-Wen Chen;
Xue-Wen Chen
Department of Electrical and Electronic Engineering,
University of Hong Kong
, Pokfulam Road, Hong Kong, China; Centre for Optical and Electromagnetic Research, Zhejiang University
, Hangzhou 310058, China; Joint Research Centre of Photonics of the Royal Institute of Technology
, Sweden; and Zhejiang University
, Zhijingang campus, Hangzhou 310058, China
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Wallace C. H. Choy;
Wallace C. H. Choy
a)
Department of Electrical and Electronic Engineering,
University of Hong Kong
, Pokfulam Road, Hong Kong, China
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Sailing He;
Sailing He
Centre for Optical and Electromagnetic Research,
Zhejiang University
, Hangzhou 310058, China; Joint Research Centre of Photonics of the Royal Institute of Technology
, Sweden; and Zhejiang University
, Zhijingang campus, Hangzhou 310058, China
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P. C. Chui
P. C. Chui
Department of Electrical and Electronic Engineering,
University of Hong Kong
, Pokfulam Road, Hong Kong, China
Search for other works by this author on:
Xue-Wen Chen
Wallace C. H. Choy
a)
Sailing He
P. C. Chui
Department of Electrical and Electronic Engineering,
University of Hong Kong
, Pokfulam Road, Hong Kong, China; Centre for Optical and Electromagnetic Research, Zhejiang University
, Hangzhou 310058, China; Joint Research Centre of Photonics of the Royal Institute of Technology
, Sweden; and Zhejiang University
, Zhijingang campus, Hangzhou 310058, Chinaa)
Author to whom correspondence should be addressed; telephone: (852) 2857-8485; FAX: (852) 2559-8738; electronic mail: [email protected]
J. Appl. Phys. 101, 113107 (2007)
Article history
Received:
February 13 2007
Accepted:
April 06 2007
Citation
Xue-Wen Chen, Wallace C. H. Choy, Sailing He, P. C. Chui; Comprehensive analysis and optimal design of top-emitting organic light-emitting devices. J. Appl. Phys. 1 June 2007; 101 (11): 113107. https://doi.org/10.1063/1.2739220
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