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J. Korean Ceram. Soc. > Volume 51(6); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(6): 533.
doi: https://doi.org/10.4191/kcers.2014.51.6.533
백색 LED용 색변환 렌즈의 열처리 온도 및 코팅 두께에 따른 영향
이효성, 황종희, 임태영, 김진호, 정현석1, 이미재
한국세라믹기술원 광디스플레이소재팀
1성균관대학교 신소재공학과
Effect of Heat Treatment Temperature and Coating Thickness on Conversion Lens for White LED
Hyo-Sung Lee, Jong Hee Hwang, Tae-Young Lim, Jin-Ho Kim, Hyun-Suk Jung1, Mi Jai Lee
Optic & Display Material Team, Korea Institute of Ceramic Engineering and Technology
1Department of Materials science and Engineering, Sungkyunkwan University
Today, silicon and epoxy resin are used as materials of conversion lenses for white LEDs on the basis of their good bonding and transparency in LED packages. But these materials give rise to long-term performance problems such as reaction with water, yellowing transition, and shrinkage by heat. These problems are major factors underlying performance deterioration of LEDs. In this study, in order to address these problems, we fabricated a conversion lenses using glass, which has good chemical durability and is stable to heat. The fabricated conversion lenses were applied to a remote phosphor type. In this experiment, the conversion lens for white LED was coated on a glass substrate by a screen printing method using paste. The thickness of the coated conversion lens was controlled during 2 or 3 iterations of coating. The conversion lens fabricated under high heat treatment temperature and with a thin coating showed higher luminance efficiency and CCT closer to white light than fabricated lenses under low heat treatment temperature or a thick coating. The conversion lens with $32{mu}m$ coating thickness showed the best optical properties: the measured values of the CCT, CRI, and luminance efficiency were 4468 K, 68, and 142.22 lm/w in 20 wt% glass frit, 80 wt% phosphor with sintering at $800^{circ}C$.
Key words: Remote phosphor, White LED package, Color glass, Coating thickness, Conversion lens
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