Design, synthesis and photoluminescence properties of a new orange-red phosphor K3BiTaP3O13:Sm3+
In this work, a series of K 3 Bi 1- x TaP 3 O 13 : x Sm 3+ ( x = 0.02–0.12) phosphors were synthesized using traditional high-temperature solid state reaction and their photoluminescence properties were studied. With 403 nm light excitation , three main peaks at 560–570 nm, 596–608 nm and 643–651 nm appeared, due to the 4 f →4 f characteristic transition of Sm 3+ . The best concentration of Sm 3+ ions doping is x = 0.06, and further increasing Sm 3+ will decrease the emission intensity because of concentration quenching effect. The decay curves of K 3 Bi 1- x TaP 3 O 13 : x Sm 3+ were recorded, showing decreasing luminescent lifetimes with increasing Sm 3+ concentrations. The CIE coordinates of K 3 Bi 0.94 TaP 3 O 13 :0.06Sm 3+ were (0.5515, 0.4455) corresponding to orange-red color. Furthermore, the phosphor had good thermal stability , retaining 86.9 % intensity at 200 ℃ of that at 25 °C. These results indicate that K 3 Bi 1- x P 3 O 13 : x Sm 3+ is a good orange-red phosphor for LED applications.
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