| Summary: | To reduce the issue of tri-primary color reabsorption, a new approach for single-phase phosphors as light-emitting diodes (LEDs) has been recommended. The structures, morphology, photoluminescence, thermal stability, and luminescence mechanism of a variety of Ca<sub>3</sub>Bi (PO<sub>4</sub>)<sub>3</sub> (CBPO): Ce<sup>3+</sup>/Dy<sup>3+</sup> phosphors were investigated. XRD characterization showed that all CBPO samples were eulytite structures. Furthermore, the energy transfer process from Ce<sup>3+</sup> to Dy<sup>3+</sup> in CBPO is systematically investigated in this work, and the color of light can be adjusted by changing the ratio of doped ions. Under UV light, energy is transferred from Ce<sup>3+</sup>-Dy<sup>3+</sup> mainly through quadrupole-quadrupole interactions in the CBPO host, and doping with different Dy<sup>3+</sup> concentrations tunes the emission color from blue to white. The thermal stability of the CBPO: 0.04Ce<sup>3+</sup>, 0.08Dy<sup>3+</sup> samples is outstanding, and the CIE coordinates of the samples after emission have little effect with temperature, while their emission intensity at 423 K is as strong as that at room temperature, reaching 90%. The above results indicate that this CBPO material has great potential as a white light phosphor under near-UV excitation at the optimized concentration of Ce<sup>3+</sup> and Dy<sup>3+</sup>.
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