Sensitized luminescence of Eu³⁺ in Sr₈Si₄O₁₂Cl₈: Eu³⁺,M³⁺(M³⁺=Sm³⁺,Al³⁺)

The alkali earth chlorosilicate of Sr₈Si₄O₁₂Cl₈:Eu³⁺,M³⁺(M³⁺=Sm³⁺,Al³⁺) was synthesized by the high temperature solid state method. The excitation and emission spectra were measured and the luminescent properties of red-photoluminescence were investigated. The effects of Sm³⁺ and Al³⁺ ions on the luminescence of Eu³⁺ ions and the relation of relative luminescence intensity to its composition were analyzed. The results show that M³⁺ (M=Sm³⁺, Al³⁺) ions can sensitize Eu³⁺ ions in Sr₈Si₄O₁₂Cl₈, with the relative luminescence intensity increasing 7.3% and 40.5%, respectively. The luminescence intensity reaches to the maximum when the molar fractions of Eu³⁺ and Sm³⁺ (Al³⁺) are 8% and 5% (18%), respectively.