Luminescence properties of self-activated Ca5 Mg3 Zn(VO4 )6 and Ca5 Mg3 Zn(VO4 )6 :xEu3+ phosphors.

Self-activated Ca5 Mg3 Zn(VO4 )6 and Ca5 Mg3 Zn(VO4 )6 :xEu3+ phosphors were synthesized via a high-temperature solid-state reaction route. The crystalline structure and luminescence properties of the phosphors were analyzed using an X-ray diffractometer and a photoluminescence spectrometer. The explored results indicated that by varying calcination temperature and the raw material ratio of Ca2+ /Mg2+ /Zn2+ , the phosphors could be developed with different phases, crystallinity, and various fluorescence performances. The fluorescence spectrum of Ca5 Mg3 Zn(VO4 )6 showed a broad emission band over the range 400-650 nm under an excitation wavelength of 330 nm, as well as green light emission. Furthermore, after introduction of Eu3+ ions in Eu(VO4 )4 , the luminescence intensity of the Eu3+ ions greatly increased as the Eu3+ ion concentration increased at the 393 nm excitation wavelength, showing green-yellow light emission simultaneously. Therefore, the obtained phosphors could be used as a potential green-yellow-emitting luminescent material in a white light-emitting diode device.