Enhancement of Angular Flux Utilization Based on Implanted Micro Pyramid Array and Lens Encapsulation in GaN LEDs

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/51028

Title:	Enhancement of Angular Flux Utilization Based on Implanted Micro Pyramid Array and Lens Encapsulation in GaN LEDs
Authors:	Sun,CC;Tsai,SY;Lee,TX
Contributors:	光電科學與工程學系
Keywords:	LIGHT-EMITTING-DIODES;EXTERNAL QUANTUM EFFICIENCY;PHOTONIC CRYSTAL;EXTRACTION EFFICIENCY;ULTRAVIOLET;SIMULATION;SUBSTRATE;BLUE
Date:	2011
Issue Date:	2012-03-27 18:16:02 (UTC+8)
Publisher:	國立中央大學
Abstract:	In the application of projection display, the effective flux utilization is an important factor to the optical system with more optical efficiency of the system with utilization of the light source such as LEDs. In this paper, based on Monte Carlo ray tracing we simulate light extraction efficiency as well as directionality of the light pattern of sapphire-based and Thin-GaN LEDs implanted with micro-pyramid structure with or without lens encapsulation. We have shown that micro-pyramid structures at some specific slanted angles in the LEDs are useful to increase effective flux utilization through enhancement of light extraction efficiency. In the case of the sapphire-based GaN LEDs, the slanted angle in a range of 45 degrees to 55 degrees, with lens encapsulation, the enhancement ratio of angular flux utilization is as high as 390%. In the case of Thin-GaN LEDs, both the slanted angle of 25 degrees without lens encapsulation and 45 degrees with lens encapsulation (LEC) are effective ways to obtain high angular flux utilization. The enhancement ratio of angular flux utilization is as high as 500% or more and the light extraction efficiency in 30 degrees light cone reaches more than 18%.
Relation:	JOURNAL OF DISPLAY TECHNOLOGY
Appears in Collections:	[Department of Optics and Photonics] journal & Dissertation

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