Eu3+ doped Ca3LiSbO6 and Eu3+, Li+ co-doped Ca3LiSbO6 phosphors for white light-emitting diodes.

Novel antimonate Ca 3 LiSbO 6 : x Eu3+ red phosphor was synthesised using a high-temperature solid-phase reaction. The effect of Eu3+ doping concentration on its crystal structure and luminescence performance was investigated. It was found that Eu3+ was at the inversion symmetry site in the lattice of Ca 3 LiSbO 6. To improve the luminescence performance of Ca 3 LiSbO 6 : 0.05Eu3+ red phosphor, Ca 3 LiSbO 6 : 0.05Eu3+, x Li + red phosphor was synthesised. The doping of Li + can correct the charge difference generated by the substitution of Ca2+ by Eu3+, reduce the generation of defects, enhance the local symmetry of the luminescence centre of Eu3+, improve the structural rigidity, and thus enhance the luminous intensity of the phosphor. At 423 K, the luminous intensity of this phosphor was 68 % of the initial temperature, which was higher than that of the phosphor without the charge compensator Li+ (60 %), indicating that Li+ improved the thermal stability of the phosphor. Changes in luminescence properties of Ca 3 LiSbO 6 doped Eu3+ and co-doped Eu3+ and Li+ and applications in white light-emitting diodes. [Display omitted] • Ca 3 LiSbO 6 :Eu3+ and Ca 3 LiSbO 6 :Eu3+,Li+ phosphors have high color purity. • Co-doping with Li+ improves color purity and thermal stability of the phosphor. • W-LED made of Ca 3 LiSbO 6 :Eu3+,Li+ have better color rendering indices than commercially W-LED. [ABSTRACT FROM AUTHOR]