Synthesis and luminescence enhancement of Eu3+, Sm3+ co-doped Li1.11Ta0.89Ti0.11O3 phosphor

Abstract Phosphors based on the Li 1+ x Ta 1− x Ti x O 3 solid solutions (0.05 ≤  x  ≤ 0.25) as host materials were investigated. The optimal composition of the host for red-light emitting phosphor was found to be Li 1.11 Ta 0.89 Ti 0.11 O 3 ( x  = 0.11) when activated with Eu 3+ . In this work, in order to further enhance the emission intensity, a series of Eu 3+ - and Sm 3+ -doped Li 1.11 Ta 0.89 Ti 0.11 O 3 phosphors was synthesized by solid-state reaction. The phosphor doped with 2.5 wt% Eu 2 O 3 and 0.1 wt% Sm 2 O 3 showed the highly efficient red-light emission upon excitation at 399 nm, with the internal quantum efficiency being 98%. Its PL intensity was ca . 1.4 times higher than that of the 2.5 wt% Eu 3+ -doped Li 1.11 Ta 0.89 Ti 0.11 O 3 phosphor, indicating that the small amount of Sm 3+ acted as an effective sensitizer.