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https://doi.org/10.3938/NPSM.67.1138
Simulation Study on the Effects of the Shapes of Microlens Arrays on the Outcoupling Efficiency and the Luminous Intensity Properties of Organic Light Emitting Diodes
New Physics: Sae Mulli 2017; 67: 1138~1144
Published online September 29, 2017;  https://doi.org/10.3938/NPSM.67.1138
© 2017 New Physics: Sae Mulli.

Bong Jin CHO1, Jae-Hyeon KO*1, Young Wook KO2, Yongduk KIM2, Yong Hwan YOO2

1 Department of Physics, Hallym University, Chuncheon 24252, Korea
2 Cheorwon Plasma Research Institute, Cheorwon 24062, Korea
Correspondence to: hwangko@hallym.ac.kr
Received July 5, 2017; Revised July 14, 2017; Accepted July 20, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Various forms of microlens arrays were applied to organic light emitting diodes (OLEDs), and their effects on the outcoupling efficiency (OCE) and the luminous intensity distribution were studied by using optical simulations. One-dimensional microlens arrays, such as prism, round prism, and lenticular lens arrays, increased the OCE by 1.47$\sim$1.58 times compared to that of the flat OLED. On the other hand, two-dimensional microlens arrays, such as semisphere, pyramid, and cone lenses, arranged on a hexagonal lattice improved the OCE by 1.74 times. The maximum OCEs for two cases, an embossed lens and a concave lens, were not significantly different. The two-dimensional lens arrays exhibit isotropic intensity distributions whereas the one-dimensional lens arrays exhibit anisotropic intensity distributions. This is a natural result considering the conditions of the slopes of the lenses which cause the refraction of light. 
PACS numbers: 42.15.Eq, 42.79.Kr
Keywords: Organic light emitting diode, Microlens, Outcoupling efficiency, Simulation, Intensity distribution


September 2017, 67 (9)