Effect of co-doped La3+ and excessive concentration Sr2+ on the luminescence properties of Sr1.96Eu0.04SiO4

Abstract

Abstract: Sr_1.96－xEu_0.04SiO₄∶xLa³⁺(x = 0,0.01,0.02,0.03,0.04,0.05) and Sr_1.94+yEu_0.04La_0.02SiO₄∶ySr²⁺(y=0,0.05,0.10,0.20,0.30) were synthesized by high-temperature solid-state method. The structure and luminescence properties of the phosphors were characterized by X-ray powder diffractometer and fluorescence spectrophotometer. The results showed that the XRD of the phosphors are consistent with the Sr₂SiO₄ standard card PDF 39-1256, and no impurity phase is produced. The luminescence intensity of phosphors Sr_1.96Eu_0.0₄SiO₄ is enhanced by doped La³⁺, and the position of emission peak remain unchanged. The phosphors show the strongest luminescence intensity when the doped concentration of La³⁺ is 2% (molar fraction). The luminescence intensity of Sr_1.94Eu_0.04La_0.02SiO₄ can be further enhanced by doped series of excessive concentrations of Sr²⁺ without changed the position and shape of the emission peak. When Sr²⁺ is excessive 10%, the luminescence intensity of the phosphors is the strongest. The broadband emission spectrum of the phosphors can be fitted as two independent emission peaks, which correspond to Eu²⁺ 4f⁶5d¹→4f⁷ transition. The intensity of two emission peaks changes regularly with increasing ventilation volume, which give rise to the luminescence color of phosphors changes from green to yellow.

Key words: phosphors, high-temperature solid-state method, rare earth ions, strontium silicate

CLC Number:

TB34
Q061

WANG Wei, ZHU Hong-bo, WU Mei. Effect of co-doped La³⁺ and excessive concentration Sr²⁺ on the luminescence properties of Sr_1.96Eu_0.04SiO₄[J]. Journal of Lanzhou University of Technology, 2024, 50(4): 12-16.

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Effect of co-doped La³⁺ and excessive concentration Sr²⁺ on the luminescence properties of Sr_1.96Eu_0.04SiO₄

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