| The Densification and Photoluminescence Characteristics of Ca-α-SiAlON:Eu2+ Plate Phosphor |
| Young-Jo Park, Jae-Wook Lee, Jin-Myung Kim, Brahma Raju Golla, Chang-Bun Yoon1, Chulsoo Yoon1 |
Engineering Ceramics Research Group, Korea Institute of Materials Science
1Electro Materials and Device Center, Samsung LED |
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| ABSTRACT |
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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. |
| Key words:
Phosphor, SiAlON, Plate, Sintering, Crystal, Amorphous |
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