Abstract
Tm<sup>3+ </sup>doped NaCa<sub>3</sub>Bi(PO<sub>4</sub>)<sub>3</sub>F blue-emitting phosphors have been synthesized following a conventional high-temperature solid-state reaction. Their phase purity, optical characteristics were systematically studied. The results show that the optimal doping concentration of Tm<sup>3+</sup>was 0.05. Electric multipole interaction was proposed as the mechanism for concentration quenching in NaCa<sub>3</sub>Bi(PO<sub>4</sub>)<sub>3</sub>F materials. Furthermore, the NaCa<sub>3</sub>Bi(PO<sub>4</sub>)<sub>3</sub>F:0.05Tm<sup>3+</sup> fluoresces blue with color coordinates (0.1592, 0.0346). The results indicated that NaCa<sub>3</sub>Bi(PO<sub>4</sub>)<sub>3</sub>F:Tm<sup>3+</sup> phosphors could participate in fabricating the w-LEDs as the blue component.
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