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Journal of the American Ceramic Society

Synthesis and Tunable Luminescent Properties of Red Phosphor Li1−mAgmLa0.99−nYnPr0.01(MoO4)2 with Blue Excitation for White LEDs

Authors


  • This work was financially supported by Innovation Program of Shanghai Municipal Education Commission (10YZ70, 09ZZ136), Science Foundation of Shanghai Normal University (SK201002), Shanghai Science and Technology Development Fund (no. 09520500500, 11ZR1426500) and the Key Laboratory of Resource Chemistry of Ministry of Education of China.

Author to whom correspondence should be addressed. e-mail: xibinyu@shnu.edu.cn

Abstract

Preparation of Li1−mAgmLa0.99−nYnPr0.01(MoO4)2 phosphors was done by a convenient method of solid-state reaction technique in the air. The effects of synthesis temperature, substitution of Ag+, Y3+ on the LiLa(MoO4)2 crystal structure, and luminescence properties of Pr3+ 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 Pr3+ luminescence intensity drastically. The variability of Y3+ and La3+ content changes the emission intensity ratio of the 1D2 → 3H4 and 3P0 → 3F2 transition, so that the CIE chromaticity coordinates of the as-prepared Li1−mAgmLa0.99−nYnPr0.01(MoO4)2 phosphors are tuned from (0.639, 0.351) to (0.653, 0.337).

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