Date

Place

Room H (Room Hall 1, 1F)
P1. Poster Session I
August 20, 2015 (Thursday)
14:00 ~ 15:30

[P1-128]
14:00 ~ 15:30
Title:Improvement of Light Out-Coupling Efficiency in Organic Light-Emitting Diodes with Micro-Lens Array
Se Hyuk Yeom, Sang Chul Lim, Myung Chan An, Dong Ic Lee, Gyeong-Tae Park, Chang Taek Seo, Gyu Seok Choi, and Heon Gon Kim (Gumi Electronics and Information Tech. Research Inst., Korea)
Abstract: This paper reports how a micro- lenses array can affect OLEDs for enhancing out-coupling efficiency. The OLED is manufactured with micro-lens emits more light than the OLED without the micro-lens. To form micro-lens array, the front side of the glass will be hydrophobic treatment, and a micro-lens is formed on the hydrophobic surface. High efficiency OLEDs are required for display and solid state lighting applications, as mentioned above. Devices with nearly 100% internal quantum efficiency have been achieved by using phosphorescent emitting materials. In order to overcome the limitation of efficiency, various methods have been proposed to increase the out-coupling efficiency. Peng et al reported OLED on micro-lens array substrate. In this report, over 65% light is extracted from the OLED on the micro-lens array substrate as compared with the conventional device, but this device is require to complex structure by multiple process. Therefore, we propose OLEDs on micro-lens array based on simply fabrication method. The backside of ITO glass is coated with a hydrophobic material. Then, micro-lens array with 100 ��m size is formed on the hydrophobic surface by screen printing method without complex process such as photolithography, RIE etc. Through this simple process, its efficiency is over 26% than not micro-lens formed OLED.
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