Abstract
Color tunable yellow-emitting phosphors of Sr 5−5 x Eu 5 x (PO 4) 2SiO 4 ( x = 0.05–0.15) were prepared by conventional solid-state reaction method. The X-ray powder diffraction patterns, the photoluminescence excitation and emission spectra were measured. The main excitation bands of the phosphors locate at a broad band extending from 300 to 500 nm, which can match the emission of ultraviolet- and blue-emitting diode chips. The tunable luminescence color was realized by the changing Eu 2+ doping in Sr 5(PO 4) 2SiO 4. The structure and luminescence properties were investigated. Sr 5−5 x (PO 4) 2SiO 4:Eu 5 x displays two typical luminescence centers, which originate from two different Sr 2+ (Eu 2+) sites in the host. The site-occupation, the luminescence intensity and energy transfer between the Eu 2+ ions occupying two different crystallographic Sr 2+ sites were discussed on the base of the luminescence spectra and crystal structure. This is helpful to improve this phosphor for a potential application as a white light emitting diode phosphor.
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