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Coupling efficiency enhancement in organic light-emitting devices using microlens array-theory and experiment

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5 Author(s)
Peng, Huajun ; Dept. of Electr., Electron. Eng. Hong Kong Univ. of Sci. & Technol., China ; Yeuk Lung Ho ; Xing-Jie Yu ; Man Wong
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Microlens arrays are introduced on glass substrates to improve the out-coupling efficiency of organic light-emitting devices (OLEDs). The microlenses suppress waveguiding loss in the substrate. A theoretical model, based on electromagnetic wave propagation and geometric ray tracing, is developed to simulate the enhancement effects and optimize the structure parameters of the lens pattern. A simple soft-lithography approach is employed to fabricate the microlens array on glass substrates. With the use of an optimized lens pattern, an increase of over 85% in the coupling efficiency of the OLED is expected theoretically. An increase of 70% in the coupling efficiency is achieved experimentally, without detrimental effect to the electrical performance of the OLED.

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Display Technology, Journal of  (Volume:1 ,  Issue: 2 )