Highly thermally stable single-phased white-light-emitting luminescence achieved by Dy3+ or Tb3+ Co-doped LiLa(MoO4)2:Sm3+ red-orange phosphors

A tunable white light phosphor, LiLa(MoO4)2: Sm3+, Sm3+/Dy3+, Sm3+/Tb3+, was synthesized using a hightemperature solid-state reaction method. Its luminescence properties were investigated through various analyses, including excitation and emission spectra, as well as Commission Internationale de l ' Eclairage (CIE) coordinates. The results showed that Sm3+-doped LLMO exhibited a characteristic red emission at 602 nm when excited at 276 nm and retained 95.96% of its initial intensity, indicating strong thermal stability. Furthermore, by varying the co-doping concentration, the white light emission of LLMO: Sm3+/Dy3+, Sm3+/Tb3+ can be tuned, allowing for modulation of the emission color along the X and Y axes with excellent thermal stability at high temperatures, namely a high-intensity retention of 78.2% and 94.8% at 425 K, respectively. Overall, the findings suggest that the proposed phosphors hold great potential for applications in both white and colored LED lighting.