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The Densification and Photoluminescence Characteristics of Ca-α-SiAlON:Eu2+ Plate Phosphor
박영조,이재욱,김진명,Brahma Raju Golla,윤창번,윤철수 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.4
Plate-type phosphor is a promising substitute in overcoming the issues related to the powder phosphor paste mixed with resin. In this research, Ca-α-SiAlON:Eu2+ plate phosphor (CaxSi12-(m+n)Alm+nOnN16-n:Euy) 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 α2 specimen (m = 3.0, n = 1.5) containing the second phases when compared to α1 specimen (m = 1.5, n = 0.75) comprising a single-phase α-SiAlON. The concentration of Eu in the non-emitting amorphous interfacial glass phase was 2~4 times of the designed Eu concentration inside the α-SiAlON crystal.
Park, Young-Jo,Lee, Jae-Wook,Kim, Jin-Myung,Golla, Brahma Raju,Yoon, Chang-Bun,Yoon, Chulsoo The Korean Ceramic Society 2013 한국세라믹학회지 Vol.50 No.4
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.