中文摘要：

采用高温固相反应合成了Y1-x-yEuxGdyTaO4荧光体,经过XRD证明产物为纯相的M′型YTaO4结构。通过对样品的光谱测试表明,TaO43-将吸收的能量传递给Eu3＋,起着一定的敏化作用。掺入少量Gd3＋对YTaO4∶Eu的发光有一定的增强作用。用147nm的真空紫外光激发样品时,样品具有较强的荧光发射,其主发射峰位于612nm,具有较好的色纯度。

英文摘要：

Rare earth tantalate is a kind of outstanding host material. Since containing elements with high atomic number, owing high density, strong X-ray absorption, high chemical stability and good radiation persistence, yttrium orthotantalate （YTaO4 ） was considered as a promising host for both X-ray and VUV phosphors. YTaO4： Gd, Eu was synthesized by solid state reaction, and the conditions of reaction were studied in detail ： The mixture of appropriate amounts of Y2O3 （99.99%）, Eu2O3 （99.99%）, Gd2O3 （99.99%）, Ta2O5 （99. 999% ） and Li2SO4 （A. R）, the Li2SO4 was added 1% as flux, was thoroughly ground and then move to an aluminate crucible. The furnace was heated to and kept at 1 250 ℃. The crucible was put into the furnace and fired for 4 h. The crucible was taken out directly from furnace at 1 250 ℃. After reground, the mixture was heated again at 1 250 ℃ for another 4 h. The crucible was then taken out from the furnace at 1 250 ℃. The sample of pure M＇-YTaO4 was obtained when the crucible was cooled to room temperature. The XRD result indicated that we got the pure M＇ type of YTaO4： Gd, Eu. The excitation and emissioin spectra of YTaO4 were measured. The excitation band at 230 nm is described to a charge transfer band nature of TaO43- group. The emission band of YTaO4 situated at 365 nm. The main emission peak of YTaQ： Eu3＋ is at 611 nm and the excitation band of YTaO4： Eu3 ＋ is at about 250 nm. The excitation band at 250 nm was attributed to the result of the overlap of two charge transfer bands within Eu-O and Ta-O. This overlap makes the UV absorption of the phosphor enhanced. The quenching concentration of Y1-xEuxTaO4 luminescence is at about x =0.06. For the spectra of Y0.94-yGdyEu0.06TaO4, the doping of Gd3＋ ion into YTaO4： Eu3＋ did not change the energy position of Eu3＋ luminescence, but enhanced the emission intensity of phosphors. The best doping concentration of y is about 0.1. For the emission spectra of Yo 94 Eu0.06 TaO4 and Y0.84 Gd0.10 Eu0.06