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-α-SiAlON:Eu 2+ plate phosphor (CaxSi 12-(m+n) Al m+n O n N 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 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.
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