Synthesis and Characterization of Eu^{2 +}/Ce^{3 +} Doped Ca₃Si₂O₄N₂ Phosphors

Eu²⁺/Ce³⁺ doped Ca₃Si₂O₄N₂ phosphors have been successfully synthesized at 1450 °C via a solid-state reaction method under a nitrogen atmosphere. Their photoluminescence (PL) properties exhibit the main emission peaks at 506 nm and 420 nm for Eu²⁺/Ce³⁺ doped Ca₃Si₂O₄N₂ respectively, which can be excited in the range from 280 nm to 380 nm, indicating them the attractive candidate phosphors as near ultraviolet (UV) phosphor-converted light-emitting diodes (pc-LEDs). Moreover, it is found that the luminescence property is doping-concentration dependent, and the energy transfer results in a red-shift with increasing Eu²⁺/Ce³⁺ concentration. The quenching concentrations of Eu²⁺ and Ce³⁺ are approximately 7 at.% and 5 at.%, respectively.