Molten salt synthesis and photoluminescence properties of novel red emitting phosphors Ba_5(VO_4)_3Cl:Eu~(3+),K~(1+)

摘要

A series of Ba_5(VO_4)_3Cl:Eu~(3+),K~+ phosphors have been synthesized by the molten salt synthesis method. The crystalline structure, morphology, photoluminescence properties and lifetimes were characterized using X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and photoluminescence spectros-copy, respectively. XRD indicates that the Ba_5(VO_4)_3Cl:Eu~(3+),K~+ phosphors are synthesized successfully via molten salt method. SEM image demonstrates that the obtained phosphors have hexagonal polyhedron morphology. The photoluminescence spectra reveal that the as-prepared phosphors exhibit a bright red emission under the excitation of blue or near ultraviolet light. The concentration quenching was also investigated, and the dipole-dipole interaction is responsible for the concentration quenching of fluorescence emission of Eu~(3+) ions in Ba_5(VO_4)_3Cl phosphor. The present work suggests that the Ba_5(VO_4)_3Cl:Eu~(3+),K~+ phosphors would be a potential candidate for light emitting devices.