Improvement of Luminescence Properties of Eulytite Single-Phase White Emitting Ca(3)Bi (PO(4))(3): Ce(3+)/Dy(3+) Phosphor

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(3)Bi (PO(4))(3) (CBPO): Ce(3+)/Dy(3+) phosphors were investigated. XRD characterization showed that all CBPO samples were eulytite structures. Furthermore, the energy transfer process from Ce(3+) to Dy(3+) 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(3+)-Dy(3+) mainly through quadrupole-quadrupole interactions in the CBPO host, and doping with different Dy(3+) concentrations tunes the emission color from blue to white. The thermal stability of the CBPO: 0.04Ce(3+), 0.08Dy(3+) 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(3+) and Dy(3+).