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http://dx.doi.org/10.4313/JKEM.2011.24.10.817

Optical Thin Film and Micro Lens Design for Efficiency Improvement of Organic Light Emitting Diode  

Ki, Hyun-Chul (Korea Photonics Technology Institute Photonics Fusion System Research Center)
Kim, Doo-Gun (Korea Photonics Technology Institute Photonics Fusion System Research Center)
Kim, Seon-Hoon (Korea Photonics Technology Institute Photonics Fusion System Research Center)
Kim, Sang-Gi (Linkline I&C)
Park, A-Reum (Department of Electrical Engineering, Chonnam National University)
Gu, Hal-Bon (Department of Electrical Engineering, Chonnam National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.24, no.10, 2011 , pp. 817-821 More about this Journal
Abstract
We have proposed an optical thin film and micro lens to improve the luminance of organic light emitting device. The first method, optical thin film was calculated refractive index of dielectric layer material that was modulated refractive index of organic material, ITO (indium tin oxide)and glass. The second method, microlens was applied with lenses on the organic device. Optical thin films were designed with Macleod Simulator and Micro Lenses were calculated by FDTD (finite-difference time-domain) solution. The structure of thin film was designed in organic material/ITO/dielectric layer/glass. The lenses size, height and distance were 5 ${\mu}m$, 1 ${\mu}m$, 1 ${\mu}m$, respectively. The material of micro lenses used silicon dioxide. Result, The highest luminance of OLED which applied with microlens was 11,185 $cd/m^2$, when approval voltage was 14.5 V, applied thin film was 5,857 $cd/m^2$. The device efficiency applying microlens increased 3 times than the device which does not apply microlens.
Keywords
OLED; Thin film; Dielectric layer; Micro lens; Luminance;
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Times Cited By KSCI : 1  (Citation Analysis)
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