Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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A study of light output characteristics with various refractive indices and geometrical structures of the GaN based light-emitting device encapsulants

질화갈륨계 발광소자 봉지재의 굴절률 및 곡률 변화에 따른 광 출력 특성 연구

  • 김형진 (국립순천대학교 인쇄전자공학과(WCU)) ;
  • 유진열 (순천대학교 미래전략신소재공학과) ;
  • 강영래 (한국광기술원 반도체조명 연구센터) ;
  • 김재필 (한국광기술원 반도체조명 연구센터) ;
  • 곽준섭 (국립순천대학교 인쇄전자공학과(WCU))
  • Received : 2012.04.03
  • Accepted : 2012.05.21
  • Published : 2012.07.31
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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[%].

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