Fluorescent glass has advantages of homogeneous light emission, excellent thermal stability, and stable product quality as compared with traditional phosphors. Therefore, fluorescent glass in the field of LED has become a research hot spot in recent years. In this paper, Eu 3+ doped borate glasses were synthesized via the conventional melt-quenching technique. The luminescence properties and thermal stability of the fluorescent glass samples were characterized by fluorescence spectra. The doping concentration of RE 3+ ions is an important factor influencing the samples' luminescent performance. Based on the Van Uitert model, concentration quenching behavior for the prepared glass samples was studied. It is found that the fluorescence quenching of the samples is attributed to the nonradiative energy transfer through cross-relaxation mechanism between energy levels of Eu 3+ .As is known to all, the temperature dependence of fluorescence glass' luminescence is also important to the practical applications. The temperature quenching mechanism for the prepared glass samples was analyzed by Arrhenius model, and it was found that the temperature quenching could be ascribed to the crossover model. The activation energy for the prepared glass samples is obtained from fitting processes which is found to be (0.350.04) eV. The interaction between Eu 3+ ion and glass host was also analyzed. The result shows that the interaction between Eu 3+ ions and the glass host is weak coupling.

A series of Ba 3 Gd(PO 4) 3 phosphors with different Eu 3+ 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 Eu 3+ introduction did not change the crystal structure. The luminescence spectra and decay curves were analyzed as a function of Eu 3+ concentration and temperature. It was found that the luminescent color of the phosphor can be adjusted from white to red with the increase of Eu 3+ 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 Eu 3+ ions resulting in the concentration quenching. The temperature dependence of 5 D 0 fluorescence emissions was analyzed, and it was deduced that the thermal quenching behavior of 5 D 0 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 Eu 3+ in the Ba 3 Gd(PO 4) 3 phosphors were calculated by a facile method in the framework of the J-O theory, in which the refractive index of Ba 3 Gd(PO 4) 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.