Charge compensating effect of cation doping on the enhanced luminescent and stability of La2LiTaO6:Mn4+red phosphor

The La2LiTaO6:xMn4+ red phosphors with double perovskite structure were prepared by traditional solid-state method. The broad absorption band of the La2LiTaO6:0.003Mn4+ phosphor is located at ultraviolet and blue light in the range of 200-600 nm, and the emission band of deep red light is located at 711 nm under excitation of near-ultraviolet light. The phosphor has a high color purity of 95.5% and an excellent thermal stability of 85.7%. To further enhance the performance of the phosphor, a cation doping method was adopted in this paper to synthesize La2LiTaO6:0.003Mn4+, 0.005 R (R = Zn2+, Mg2+, Ca2+, Na+, K+) phosphors. The luminescence in-tensity of the samples was enhanced after doping with different cations, and the related mechanism was dis-cussed. The optimized La2LiTaO6:0.003Mn4+, 0.01Zn2+ phosphor has good luminescence performance and thermal stability of 91.5%. The emission spectrum of the sample matches with phytochrome PFR and is suitable for indoor plant lighting. The prepared WLED exhibits relatively low color temperature (3928 K), high color rendering index (84.5) and produces good photostability under different driving currents. Therefore, the La2LiTaO6:0.003Mn4+, 0.01Zn2+ phosphor has the potential to be applied as a deep red component in LED.