Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Development and Characterization of Translucent Opal Glass for Diffuser of LED Lighting

LED 조명용 반투명 유백유리 Diffuser 조성 개발 및 특성

  • 구현우 (한국세라믹기술원 광.디스플레이소재팀) ;
  • 임태영 (한국세라믹기술원 광.디스플레이소재팀) ;
  • 김진호 (한국세라믹기술원 광.디스플레이소재팀) ;
  • 이미재 (한국세라믹기술원 광.디스플레이소재팀) ;
  • 황종희 (한국세라믹기술원 광.디스플레이소재팀) ;
  • 신동욱 (한양대학교 신소재공학과)
  • Received : 2012.10.22
  • Accepted : 2012.11.15
  • Published : 2012.12.27
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Abstract

For the purpose of improving the durability problem, translucent opal glass was fabricated as a substitute for the polycarbonate diffuser of LED lighting. Calcium phosphate was used as an opacifier of opal glass and melted in an electric furnace. The opaque effect was identified according to the change of the cooling procedure. As results, translucent opal glass was obtained by the melting of a batch with a composition of 3.8% calcium phosphate at $1550^{\circ}C$ for 2 hrs and then the cooling of the material in the furnace. For the cooling condition of the glass sample, HTCG (High Temperature Cooled Glass) was found to have better optical properties than LTAG (Low Temperature Annealed Glass). It had excellent optical properties for a diffuser of LED lighting, with no dazzling from direct light due to its high haze value of over 99% and low parallel transmittance value of under 1%. For the thermal properties, it had an expressed thermal expansion coefficient of $5.7{\times}10^{-6}/^{\circ}C$ and a softening point of $876^{\circ}C$; it also had good thermal properties such as good thermal shock resistance and was easy to apply to the general manufacturing process in the forming of glass tubes and bulbs. Therefore, it is concluded that this translucent opal glass can be used as a glass diffuser material for LED lighting with high heat resistance and high durability; this material is suitable as a substitute for polycarbonate diffusers.

Keywords

References

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  1. Characteristics of green colored opal glass with contents of iron oxide for LED light diffuser vol.24, pp.3, 2014, https://doi.org/10.6111/JKCGCT.2014.24.3.120