Preparation And Luminescence Properties Of Sm³⁺,Eu³⁺ Doped Na₂O-La₂O₃-MoO₃-SiO₂ Glass Ceramics

Na₂O-La₂O₃-MoO₃-SiO₂（NLMS）glass ceramics were used as the matrix material.Under the precondition of adding Sm³⁺,Eu³⁺and Sm³⁺-Eu³⁺co-doped,orange-red light,red-orange light and red light luminescent materials were prepared by melting and crystallization method,respectively.The raw materials for NLMS glass ceramics were determined by referring to the literature,and the formula was designed according to the control variable method to carry out the experiment,so as to optimize the raw material ratio of the precursor glass and determine the best composition.The precursor glass samples were prepared by high temperature melting annealing technique.Through differential scanning calorimetry,X-ray diffraction,scanning electron microscope and transmittance curve,the optimum heat treatment conditions of Sm³⁺doped,Eu³⁺doped and Sm³⁺-Eu³⁺co-doped precursor glass samples were discussed and analyzed,and the final results were as follows:the nucleation condition of Sm³⁺doped was 521℃/0.5 h and its crystallization condition was 630℃/2 h,the nucleation condition of Eu³⁺doped was 525℃/0.5 h and its crystallization condition was 620℃/2 h,the nucleation condition of Sm³⁺-Eu³⁺co-doped was 511℃/0.5 h and its crystallization condition was 630℃/2 h,respectively.The optimum excitation wavelengths of Sm³⁺,Eu³⁺and Sm³⁺-Eu³⁺co-doped glass ceramics were determined by excitation spectra,and under certain excitation wavelength,the optimum doping concentration of Sm³⁺,Eu³⁺and Sm³⁺-Eu³⁺were determined in glass ceramic samples according to the change trend of emission peak intensity as following:0.7%Eu₂O₃、0.5%Sm₂O₃ and 0.5%Sm₂O₃-0.7%Eu₂O₃,and the causes of concentration quenching were discussed.The fluorescence lifetime of Sm³⁺,Eu³⁺and Sm³⁺-Eu³⁺co-doped glass ceramics with different concentration were calculated.According to the emission spectra of Sm³⁺-Eu³⁺doped glass ceramics and fluorescence lifetime testified the existence of energy transfer from the Sm³⁺to the Eu³⁺,and the energy transfer efficiency also was calculated.By adjusting the co-doping concentrations of Sm³⁺-Eu³⁺and calculating the corresponding chromaticity coordinates respectively,which can be achieved from orange to red light region,thus improve the color purity of red,indicating that Sm³⁺-Eu³⁺co-doped NLMS glass ceramic has considerable application prospect in red emission materials.