Characteristics of opal glass by calcium phosphate opacifier for a LED light diffuser
- Title
- Characteristics of opal glass by calcium phosphate opacifier for a LED light diffuser
- Author
- 신동욱
- Keywords
- Calcium phosphate; Opal glass; Opacifier; Diffuser; LED
- Issue Date
- 2013-01
- Publisher
- 한국세라믹학회
- Citation
- 한국세라믹학회지 Journal of the Korean Ceramic Society, 2013, 50(1), P.75 - 81
- Abstract
- We fabricated translucent opal glass to replace the polycarbonate diffuser in LED lighting systems in order to solve the durability problem. Batch materials of opal glass with a composition of calcium phosphate were created and melted at $1550^{circ}C$, and the effect of opaqueness was identified by an addition of 1~7% calcium phosphate as an opacifier raw material. As a result, translucent opal glass was obtained by the melting of the mixed batch materials with a composition of more than 5% calcium phosphate glass at $1550^{circ}C$ for 2 hrs, which had excellent optical properties for the diffuser of a LED lighting system with no dazzling from direct light by a high haze value exceeding 90% and a low parallel transmittance value of about 5%. For the thermal properties, the thermal expansion coefficient was found to be $5.6{sim}5.9{times}10^{-6}/^{circ}C$ and the softening point was $874{sim}884^{circ}C$. In addition, good thermal properties such as good thermal shock resistance and feasibility for use with a general manufacturing process during the forming of glass tubes and bulbs were noted. Therefore, it is concluded that this translucent opal glass can be used as a glass diffuser material for LED lighting due to its high heat resistance and high durability as a replacement for a polycarbonate diffuser.
- URI
- https://www.jkcs.or.kr/journal/view.php?doi=10.4191/kcers.2013.50.1.75
- ISSN
- 2234-0491; 1229-7801
- DOI
- 10.4191/kcers.2013.50.1.75
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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