Sr₂CaW_xMo_1−xO₆:Eu³⁺, Li⁺: An emission tunable phosphor through site symmetry and excitation wavelength

The emission of Eu³⁺ doped Sr₂CaW_xMo_1−xO₆ phosphors could be tunable by the site symmetry of the activators and the excitation wavelengths. - Highlights: • The emission of Eu³⁺ depends on site symmetry and excitation wavelengths. • The color of the samples was tunable by structure and excitation wavelength. • The effect of W and Eu content on the properties of the samples was investigated. - Abstract: A series of Eu³⁺ substituted double-perovskite Sr₂CaW_xMo_1−xO₆ phosphors were prepared by solid state reactions. The phase, photoluminescence and energy transfer of the phosphors were investigated by X-ray diffraction (XRD), photoluminescence (PL) and luminescence decay respectively. It is found that the emission of the Eu³⁺ substituted double perovskites depends on both the site symmetry of the activators and the excitation wavelengths. Based on the decay analysis of Sr₂CaW_xMo_1−xO₆ matrix and Eu³⁺ doped samples, the energy transfer efficiencies between the host and activators Eu³⁺ were investigated. The results of the emission tunable phosphors indicate their potential applications in LEDs