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질화갈륨계 발광소자 봉지재의 굴절률 및 곡률 변화에 따른 광 출력 특성 연구
김형진(Heyong-Jin Kim),유진열(Jin-Yeol Yoo),강영래(Young-Rae Kang),김재필(Jae-Pil Kim),곽준섭(Joon-Seop Kwak) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.7
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[°] to 30[°], 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[%].