Browse > Article
http://dx.doi.org/10.5207/JIEIE.2012.26.7.001

A study of light output characteristics with various refractive indices and geometrical structures of the GaN based light-emitting device encapsulants  

Kim, Heyong-Jin (국립순천대학교 인쇄전자공학과(WCU))
Yoo, Jin-Yeol (순천대학교 미래전략신소재공학과)
Kang, Young-Rae (한국광기술원 반도체조명 연구센터)
Kim, Jae-Pil (한국광기술원 반도체조명 연구센터)
Kwak, Joon-Seop (국립순천대학교 인쇄전자공학과(WCU))
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.26, no.7, 2012 , pp. 1-8 More about this Journal
Abstract
In this paper, we improved the light extraction efficiency by structural change of LEDs on conventional LEDs. We simulated the LEDs light emission as functions of LED side wall angle, various refractive indices the geometrical structures and analyzed the condition improved the light efficiency. We present the results of experimerns and simulations for light output power from LEDs for various refractive indices and the geometrical structures of the LED encapsulants. When the side wall angle range was from 40[$^{\circ}$] to 30[$^{\circ}$], the LED emission increased. LED side wall angle onto LED using the simulation system with a fine tuning of the structure of the LEDs side wall angle is fabricated. Additionally, we changed the side wall angle of LED package with spherical structure and flat structure. The result of spherical structure ray tracting is higher compared with flat structure about 14[%].
Keywords
Light-emitting Diodes; Light Output Efficiency; Encapsulant;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 D. W. Hong, M. J. Yoon, K. H. Kim, J. K. Yoo, S. J. Lee, "Design and Analysis of LED-Optical Fiber Coupler for Efficient Line Lamps" Korean Journal of Optics and Photonics, Volume 212, Number 1, February 2010.   과학기술학회마을   DOI
2 "Light Emitting Diodes (LEDs) for Generating Illumination," OIDA Technology Road Map Update 2002, 2002.
3 Manning Fan, "Color Filter-less Technology of LED Back Light for LCD-TV," Proc. SPIE, Vol.6841, 2007, pp.68410G1-68410G6.
4 S. H. Jang, K, Y, Gwon, "LED industry trends and direction of policy initiatives," IT SoC Magazine, Vol.31, 2009, pp.9-14.
5 M. W. Lee, H. Kim, "LED Optical Design for Asymmetrical Light Distribution Realization" The korean institute of illuminating and Electrical Installation Engineers. Vol.9, No.3, p.67, 2009,10.
6 N. Ohta and A. R. Robertson, Colorimetry: Fundamentals and Applications (John Wiley & Sons, UK, 2005), Chapter 3.
7 J. Y. Han, J. T. Kim, "Modeling and analysis of Optical Property for High Power LED", Optical Society of Korea, vol. 18, pp. 111-116, 2007.