논문 국내 국내전문학술지(KCI급) Improvement of Light Extraction Efficiency of LED Packages Using an Enhanced Encapsulant Design
- 학술지 구분 국내전문학술지(KCI급)
- 게재년월 2014-08
- 저자명 Hyun-Su Choi1, Joon-Sik Park2, and Cheol-Hee Moon1*
- 학술지명 Journal of the Optical Society of Korea
- 발행처명 한국광학회
- 발행국가 국내
- 논문언어 한국어
- 전체저자수 3
홈페이지첨부 파일
논문 초록 (Abstract)
We optimized the design of the flat encapsulant of a light-emitting diode (LED) package to obtain higher light output power (LOP), both by experiment and simulation using three-dimensional ray-tracing software. In the experiment, the refractive index of the encapsulant was varied (1.41 and 1.53). In addition, double-layer structures with these refractive indices (1.41/1.53) were investigated by varying the shape of the interface between the two among flat, concave, and convex. The experiments showed that the LOP of the double-layer encapsulant with convex interface increased by 13.4% compared to the single-layer encapsulant with a refractive index 1.41, which was explained by the increase of the light extraction efficiency (LEE) in connection with the increase of the critical angle (${\theta}_c$) and the decrease of the Fresnel reflection.