Title: Surface microstructure parameter optimisation for enhancing light extraction efficiency of LED

Authors: Dong Yuan; Xianyu Lin; Yanguo Liu; Guofu Zhou; Nan Li

Addresses: Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China ' Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China ' Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China ' Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China; Shenzhen Guohua Optoelectronics Tech. Co. Ltd., Shenzhen 518110, China ' Shenzhen Guohua Optoelectronics Tech. Co. Ltd., Shenzhen 518110, China

Abstract: Surface structure modification is an effective way to enhance light extraction of LED, which is limited by total internal reflection on the interfacial surface. The periodic surface structure manufactured by micromachining was proved to be a feasible way to enhance the light extraction efficiency (LEE) of LEDs. In order to obtain the highest LEE, need to optimise the structural parameters. In this paper, a simplified ray tracing optical model was built to find out a high performance microstructure parameters by simulation. Then, a mathematical model was built to further optimise the optical simulation results, obtained the optimal microstructure parameters for LEE. The performance of optimal microstructure was also studied by optical simulation.

Keywords: light emitting diode; LED; microstructure; structural parameter optimisation; micromachining; light extraction efficiency; LEE.

DOI: 10.1504/IJNM.2018.095320

International Journal of Nanomanufacturing, 2018 Vol.14 No.4, pp.342 - 360

Received: 18 Oct 2016
Accepted: 08 Aug 2017

Published online: 24 Sep 2018 *

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