Luminescence properties of solid solution Ba₂Gd_2–x Y _x Si₄O₁₃: Eu²⁺ phosphor for UV white light-emitting diodes

Cation substitution is usually utilized to optimize the phosphors luminescence properties for white light-emitting diode. In this paper, a series of silicate phosphors compounds Ba₂Gd_2–x Y _x Si₄O₁₃: Eu²⁺ (x = 0 to 1) have been synthesized by conventional solid-state reaction. The crystal structure of Ba₂Gd_2–x Y _x Si₄O₁₃: Eu²⁺ was confirmed by the Rietveld refinements, demonstrating the sample is Ba₂Gd_2–x Y _x Si₄O₁₃: Eu²⁺ solid solution. With increasing Y³⁺ concentration, the emission peak of Ba₂Gd_2–x Y _x Si₄O₁₃: Eu²⁺ gradually shifts from 505 to 494 nm (blue-shift). The temperature-dependent photoluminescence properties of Ba₂Gd_2–x Y _x Si₄O₁₃: Eu²⁺ phosphors are measured and that of the Ba₂Gd₂Si₄O₁₃: Eu²⁺ is the best in all the samples. This investigation reveals a simple linear correlation of Y³⁺ content and chromaticity coordinate. All the results indicate that Ba₂Gd₂Si₄O₁₃: Eu²⁺ is a more potential application for white light LEDs than other.