Charge Compensation Red Enhanced The Emission Of The Phosphors Sr（WO₄）_0.2（MoO₄）_0.8:Eu³⁺/Sm³⁺

There are several ways for white light diode（LED）to realize white light.Among them,the way composed of blue chip and yellow phosphor appears poor color rendering and cold light color due to the lack of red light component.However,the way of the three primary color phosphors excited by ultraviolet light is restricted by the low luminous efficiency of red phosphor.So,it is very meaningful to study the highly efficient red phosphor.In this paper,a series of Eu³⁺single-doped,Sm³⁺single-doped and Eu³⁺,Sm³⁺co-doped red phosphors were prepared by co-precipitation approach.In order to improve the luminescence properties of phosphors,this paper also prepared the charge compensated phosphors,and compared the emission intensity,color purity,thermal stability and other properties of the charge compensated and without charge compensated phosphors.The main research results are as follows:（1）Different concentrations of Sr（WO₄）_0.2（Mo O₄）_0.8:Eu³⁺,Sr（WO₄）_0.2（Mo O₄）_0.8:Sm³⁺and Sr（WO₄）_0.2（Mo O₄）_0.8:Eu³⁺,Sm³⁺phosphors without charge compensation were prepared by co-precipitation approach.The optimum Eu³⁺and Sm³⁺doping concentration of in single doped phosphors were 20%and 3%,respectively.In the co-doped phosphors,the optimal doping concentration of Sm³⁺ion in Sr_0.85（WO₄）_0.2（Mo O₄）_0.8:0.1Eu³⁺was 3%.The color coordinates and color purity of Sr（WO₄）_0.2（Mo O₄）_0.8:Eu³⁺sample were studied,and the color purity of Sr_0.8（WO₄）_0.2（Mo O₄）_0.8:0.2Eu³⁺sample was 87%.（2）In order to enhance the performance of phosphors,charge compensated Sr（WO₄）_0.2（Mo O₄）_0.8:Eu³⁺,Sr（WO₄）_0.2（Mo O₄）_0.8:Sm³⁺and Sr（WO₄）_0.2（Mo O₄）_0.8:Eu³⁺,Sm³⁺were successfully prepared without charge compensator.The structure of the samples can be measured by X-ray diffractometer.By calculated the lattice constants of Eu³⁺single-doped sample and co-doped samples and the peak ratio of（112）to other crystal faces,it was proved that the symmetry of Eu³⁺in the Sr（WO₄）_0.2（Mo O₄）_0.8:Eu3⁺,Sm³⁺was lowered when Sm³⁺was introduced into the Sr（WO₄）_0.2（Mo O₄）_0.8:Eu³⁺,so make the luminescent intensity of Eu³⁺more enhancement.Besides,energy transfer was also found in the co-doped samples,which was confirmed by spectrogram and the decay curves of Sm³⁺ions single doped and co-doped phosphors.（3）The comparison of phosphors with charge compensation and without charge compensation showed that the phosphors with charge compensation were better than the phosphors without charge compensation in emission intensity,color purity and thermal stability.