Photoluminescence properties and thermal stability of samarium-doped barium phosphate phosphors

In this paper, Sm³⁺-doped Ca₆BaP₄O₁₇ phosphors were synthesized via a conventional solid-state reaction method. Orange-red emission was observed from these phosphors under near-ultraviolet (UV) excitation at 405 nm. The luminescence properties of the obtained phosphors were characterized. The Ca₆BaP₄O₁₇:Sm³⁺ phosphor can be efficiently excited by near-UV and blue light, and their emission spectrum consists of three emission peaks, at 567, 602, and 650 nm, respectively. The thermal stability of Ca₆BaP₄O₁₇:Sm³⁺ phosphors was investigated systematically and corresponding mechanisms were proposed. Based on the results, the as-prepared Ca₆BaP₄O₁₇:Sm³⁺ phosphors are promising orange-red-emitting phosphors for near-UV-based white light-emitting diodes.