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http://dx.doi.org/10.3740/MRSK.2012.22.12.669

Effect of Glass Composition on the Optical Properties of Color Conversion Glasses for White LED  

Huh, Cheolmin (Korea Institute of Ceramic Engineering &Technology (KICET))
Hwang, Jonghee (Korea Institute of Ceramic Engineering &Technology (KICET))
Lim, Tae-Young (Korea Institute of Ceramic Engineering &Technology (KICET))
Kim, Jin-Ho (Korea Institute of Ceramic Engineering &Technology (KICET))
Lee, MiJai (Korea Institute of Ceramic Engineering &Technology (KICET))
Yoo, Jong-Sung (Particlogy Co., Limited)
Park, Tae-Ho (Particlogy Co., Limited)
Moon, Jooho (Department of Materials Science and Engineering, Yonsei University)
Publication Information
Korean Journal of Materials Research / v.22, no.12, 2012 , pp. 669-674 More about this Journal
Abstract
Yellow phosphor dispersed color conversion glasses are promising phosphor materials for white LED applications because of their good thermal durability, chemical stability, and anti-ultraviolet property. Six color conversion glasses were prepared with high Tg and low Tg specimens of glass. Luminous efficacy, luminance, CIE (Commission Internationale de l'Eclairage) chromaticity, CCT (Correlated Color Temperature), and CRI (Color Rendering Index) of the color conversion glasses were analyzed according to the PL spectrum. Color conversion glasses with high Tg glass frit, sintered at higher temperature, showed better luminous properties than did color conversion glasses with low Tg glass frit. The characteristics of the color conversion glass depended on the glass composition rather than on the sintering temperature. The XRD peaks of the YAG phosphor disappeared in the color conversion glass with major components of $B_2O_3$-ZnO-$SiO_2$-CaO and, in the XRD results, new crystalline peaks of $BaSi_2O_5$ appeared in the color conversion glass with major components of $Bi_2O_3$-ZnO-$B_2O_3$-MgO. The characteristics of CIE chromaticity, CCT, and the CRI of low Tg color conversion glasses showed worse color properties than those of high Tg color conversion glasses. However, these color characteristics of low Tg glasses were improved by thickness variation. So color conversion glasses with good characteristics of both luminous and color properties were attained.
Keywords
color conversion glass; white LED; glass frit; YAG phosphor;
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