Characterization of Ca 2 SiO 4 :Eu 2+ Phosphors Synthesized by Polymeric Precursor Process

The green emitting Ca 2 SiO 4 :Eu 2+ (C 2 S:Eu) phosphors were synthesized by the polymeric precursor process (Pechini‐type), and the effects of calcination temperature and europium (Eu) doping concentration on the luminescent properties were investigated. The crystalline β‐C 2 S was obtained in the calcination temperature of 1100°–1400°C, and Eu was reduced into Eu 2+ by annealing in 5% H 2 /N 2 atmosphere. The obtained C 2 S:Eu 2+ phosphors exhibited a strong emission at 504 nm under the excitation of λ exc =350 nm. The highest photoluminescence (PL) intensity was observed in the C 2 S:Eu 2+ phosphors either calcined at 1300°C or doped with 3 mol% Eu. The obtained PL properties were discussed in terms of crystal structure, particle size and shape, surface roughness, and effect of concentration quenching.