Synthesis and Tunable Luminescent Properties of Red Phosphor Li 1− m Ag m La 0.99− n Y n Pr 0.01 ( MoO 4 ) 2 with Blue Excitation for White LED s

Preparation of Li 1− m Ag m La 0.99− n Y n Pr 0.01 ( MoO 4 ) 2 phosphors was done by a convenient method of solid‐state reaction technique in the air. The effects of synthesis temperature, substitution of Ag + , Y 3+ on the LiLa ( MoO 4 ) 2 crystal structure, and luminescence properties of Pr 3+ in the molybdate host are investigated systematically. The observed excitation and emission spectra indicate that the phosphor can be excited effectively by the blue light (440–500 nm) and exhibit a satisfactory red emission at 605 and 649 nm, respectively. The substitution of a little Ag + for Li + enhances the Pr 3+ luminescence intensity drastically. The variability of Y 3+ and La 3+ content changes the emission intensity ratio of the 1 D 2  →  3 H 4 and 3 P 0  →  3 F 2 transition, so that the CIE chromaticity coordinates of the as‐prepared Li 1− m Ag m La 0.99− n Y n Pr 0.01 ( MoO 4 ) 2 phosphors are tuned from (0.639, 0.351) to (0.653, 0.337).