Effect of single and composite fluxes on the morphology and luminescence properties of layered perovskite Sr_1.95TiO₄:0.05Sm³⁺ phosphor

Sr_1.95TiO₄:0.05Sm³⁺ phosphors with various fluxes were synthesized. The influence of these fluxes on the crystallization behavior, morphology, and luminescence properties of Sr_1.95TiO₄:0.05Sm³⁺ phosphor was systematically investigated. The results showed that the luminescence properties and morphology of the phosphor were improved by adding fluxes. The emission intensity of the phosphor was enhanced about 39–94% with the addition of single fluxes, while, it was enhanced about 200% when H₃BO₃+NH₄HF₂ was used as composite flux. The synthesis temperature of the Sr_1.95TiO₄:0.05Sm³⁺ phosphor was decreased but the emission intensity was increased when H₃BO₃+NH₄HF₂ was used as composite flux. The luminescence spectrum mainly showed three intense emission bands at 568, 603 and 649 nm. Its luminescence lifetime was 716.77 μs. All these indicated that the addition of H₃BO₃+NH₄HF₂ was greatly useful to lower the sintering temperature, improve the crystallization and morphology, and enhance the luminescence properties of layered perovskite Sr_1.95TiO₄:0.05Sm³⁺ phosphor.