Optimization of LaPO4:Bi3+ Single-Phased White-Emitting Phosphor Luminescence Properties by Li+Na+ Doping

الملخص EN

LaPO4:Bi3+ single-phased white-emitting phosphors doped with both Li+/Na+ ions were successfully prepared by a conventional solid-state reaction technique.

Microstructures were analyzed by both X-ray diffraction and high-resolution scanning electron microscopy experiments.

Under the excitation of 335 nm, the L a 0.97 P O 4 : B i 3 + 0.03 phosphor showed four emission bands with maxima at 460 nm, 487 nm (blue), 530 nm (yellow), and 637 nm (red); these can be successfully combined to form pure white light in a single host lattice only by simple activator Bi3+ ion.

It was found that changing the concentration of dopant (Li+, Na+ ions) did not produce a change in shape or location of the emission peaks, but the value of the emission intensity increased; this was particularly evident in the red emission, which could optimize the white light emitting performance of the phosphors.

When the Na+ doping concentration was 0.02, the CIE chromaticity coordinate of phosphor L a 0.95 P O 4 : B i 3 + 0.03 , N a + 0.02 was (0.3008, 0.3203), close to that of the standard white light.