Abstract
Efficient oxynitride phosphors CaSi2O2N2:Eu2+, Ce3+ for application as down-conversion luminescent materials in wLEDs were prepared from the precursor Ca3 (PO4)2:Eu3+, Ce4+ at the relatively low temperature (1400 °C), as well as a kind of novel phosphor of Ca2AlSi3O2N5: Eu2+/Mn2+ was synthesized with CaCN2 as calcium resource. The structures and photoluminescent properties of oxynitride phosphors doped with rare earth and transition metal ions were systematically researched. The results indicate that the photoluminescence (PL) intensity can be highly improved when Eu2+/Ce3+ ions are doped with appropriate amounts in CaSi2O2N2 matrix. The rare earth or transition metal ions occupy two different lattice sites in the Ca2AlSi3O2N5 host according to the PL spectra.
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