“…As mentioned previously, the XRD measurements (Figure 1) show that at low Ca contents ( i.e ., Y = 0.25 and 0.75), the phases of Ca-α-SiAlON (including Ca-α-SiAlON:Eu 2+ and Ca-α-SiAlON), AlN (including AlN:Eu 2+ and AlN), CaO, Eu 3 N 2 , Ca 2 Al 2 SiO 7 and residual Eu 2 O 3 were detected in addition to the phase of CaAlSiN 3 [21]. Among these, CaAlSiN 3 , Ca-α-SiAlON and AlN have been reported to be possible host lattices forming phosphors activated by Eu 2+ [10,11,12,13,14,15,16,17,18,19,20].…”