Synthesis and photoluminescence properties of Sm3+ and Dy3+ ions activated double perovskite Sr2MgTeO6 phosphors

A series of double perovskite Sr₂MgTeO₆:Sm³⁺/Dy³⁺ phosphors for solid-state lighting application were successfully synthesized by the solid-state reaction process. The phase structure, photoluminescence, thermal quenching, and decay behavior of the prepared phosphors were investigated. The photoluminescence of Sr₂MgTeO₆:Sm³⁺ exhibits red emission (640 nm) due to the transition from the ⁴G_5/2 → ⁶H_7/2 under 404 nm excitation. Sr₂MgTeO₆:Dy³⁺ exhibits two emission bands under 390 nm excitation. They are due to ⁴F_9/2 → ⁶H_15/2 (blue) and ⁴F_9/2 → ⁶H_13/2 (yellow) transitions of Dy³⁺, respectively. Sr₂MgTeO₆:0.10Sm³⁺ phosphor shows excellent thermal stability. Therefore, Sr₂MgTeO₆:Sm³⁺/Dy³⁺ phosphors are a promising candidate for UV chip-based WLED and solid-state lighting.