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http://dx.doi.org/10.4191/kcers.2013.50.4.280

The Densification and Photoluminescence Characteristics of Ca-α-SiAlON:Eu2+ Plate Phosphor  

Park, Young-Jo (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Lee, Jae-Wook (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Kim, Jin-Myung (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Golla, Brahma Raju (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Yoon, Chang-Bun (Electro Materials and Device Center, Samsung LED)
Yoon, Chulsoo (Electro Materials and Device Center, Samsung LED)
Publication Information
Journal of the Korean Ceramic Society / v.50, no.4, 2013 , pp. 280-287 More about this Journal
Abstract
Plate-type phosphor is a promising substitute in overcoming the issues related to the powder phosphor paste mixed with resin. In this research, $Ca-{\alpha}-SiAlON:Eu^{2+}$ plate phosphor ($Ca_xSi_{12-(m+n)}Al_{m+n}O_nN_{16-n}:Eu_y$) was investigated for the varied compositions (m,n) of the host crystal with the fixed Eu content (y). Densification was promoted for the compositions with increasing 'm' values for the m=2n relationship. Dictated by the Eu concentration inside the phosphor crystal, photoluminescence intensity was stronger in ${\alpha}2$ specimen (m = 3.0, n = 1.5) containing the second phases when compared to ${\alpha}1$ specimen (m = 1.5, n = 0.75) comprising a single-phase ${\alpha}$-SiAlON. The concentration of Eu in the non-emitting amorphous interfacial glass phase was 2~4 times of the designed Eu concentration inside the ${\alpha}$-SiAlON crystal.
Keywords
Phosphor; SiAlON; Plate; Sintering; Crystal; Amorphous;
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