中文摘要：

采用高温固相反应法合成了不同Eu3＋掺杂浓度的Ba3Gd（PO4）3荧光粉。利用X射线衍射对产生的晶体结构进行了分析,证实产物为纯相,Eu3＋的引入没有导致晶体结构的改变。利用Van Uitert模型对5D0能级荧光的浓度猝灭行为进行了研究,发现浓度猝灭是由于Eu3＋间交换相互作用所导致。分析了5D0荧光发射的温度依赖,给出了荧光温度猝灭行为符合横向穿越模型,并通过非线性拟合获得了激活能。利用Eu3＋的发射光谱和荧光衰减数据,计算了5D0→7FJ辐射跃迁速率及荧光分支比,同时得到了光学跃迁强度参数。

英文摘要：

A series of Ba3Gd（PO4）3 phosphors with different Eu3＋ concentrations were synthesized by a high-temperature solid-state method. The crystal structure of the products was examined by means of X-ray diffraction, and it was confirmed that the final products existed in a pure phase and the Eu3＋ introduction did not change the crystal structure. The luminescence spectra and decay curves were analyzed as a function of Eu3＋ concentration and temperature. It was found that the luminescent color of the phosphor can be adjusted from white to red with the increase of Eu3＋ concentration. Concentration quenching for the prepared phosphors was studied based on the Van Uitert model and Dexter theory, which confirmed that the exchange interaction was responsible for energy transfer between Eu3＋ions resulting in the concentration quenching. The temperature dependence of 5D0 fluorescence emissions was analyzed, and it was deduced that the thermal quenching behavior of 5D0 fluorescence followed well the crossover model. The activation energy was obtained from the nonlinear fitting on the temperature quenching of luminescence intensity. Finally, Judd-Ofelt parameters of Eu3＋ in the Ba3Gd（PO4）3 phosphors were calculated by a facile method in the framework of the J-O theory, in which the refractive index of Ba3Gd（PO4）3 was deduced to be about 1.55. Meanwhile, the radiative transition rates, fluorescence branching ratios and the J-O parameters were calculated by using the emission spectra and fluorescence decay.