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.

Automated summary

A tunable white light phosphor was synthesized and its luminescence properties were investigated. The results showed that the phosphor exhibited strong thermal stability and the emission color could be modulated by varying the co-doping concentration.