Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Lu3Al5O12:Ce3+ and (Sr,Ca)AlSiN3:Eu2+ Phosphor Content on Glass Conversion Lens for High-Power White LED

  • Lee, Hyo-Sung (Optic & Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Hwang, Jong Hee (Optic & Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Lim, Tae-Young (Optic & Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Jin-Ho (Optic & Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Jeon, Dae-Woo (Optic & Display Material Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Jung, Hyun-Suk (Department of Materials science and Engineering, Sungkyunkwan University) ;
  • Lee, Mi Jai (Optic & Display Material Team, Korea Institute of Ceramic Engineering and Technology)
  • Received : 2015.01.20
  • Accepted : 2015.03.24
  • Published : 2015.07.31
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Abstract

Currently, the majority of commercial white LEDs are phosphor converted LEDs made of a blue-emitting chip and YAG yellow phosphor dispersed in organic silicone. However, silicone in high-power devices results in long-term performance problems such as reacting with water, color transition, and shrinkage by heat. Additionally, yellow phosphor is not applicable to warm white LEDs that require a low CCT and high CRI. To solve these problems, mixing of green phosphor, red phosphor and glass, which are stable in high temperatures, is common a production method for high-power warm white LEDs. In this study, we fabricated conversion lenses with LUAG green phosphor, SCASN red phosphor and low-softening point glass for high-power warm white LEDs. Conversion lenses can be well controlled through the phosphor content and heat treatment temperature. Therefore, when the green phosphor content was increased, the CRI and luminance efficiency gradually intensified. Moreover, using high heat treatment temperatures, the fabricated conversion lenses had a high CRI and low luminance efficiency. Thus, the fabricated conversion lenses with green and red phosphor below 90 wt% and 10 wt% with a sintering temperature of $500^{\circ}C$ had the best optical properties. The measured values for the CCT, CRI and luminance efficiency were 3200 K, 80, and 85 lm/w.

Keywords

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