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采用溶胶-凝胶法(sol-gel method)于不同气氛条件下成功合成了Zn1.92-xMgxSiO4:0.08Mn2+(0≤x≤0.12)系列粉末样品.利用X射线衍射(XRD)、光致发光(PL)谱等分析手段对Zn1.92-xMgxSiO4:0.08Mn2+系列荧光粉的结构、晶胞参数、发光性能进行了表征.结果表明:Zn1.92-xMgxSiO4:0.08Mn2+样品中掺杂的Mg2+取代了Zn2+离子格位并形成MgO4四面体,由于MgO4基团约在154nm处有吸收,掺杂适量Mg2+提高了样品的发光强度,Mg最佳掺杂浓度约为0.06mol;热处理气氛显著影响荧光粉的发光强度,前驱体在N2保护气氛下于1100℃保温4h,缓冷至900℃于N2(95%)+H2(5%)的还原气氛下进行热处理,得到的系列荧光粉发光强度最强;经低温还原热处理所得最佳样品Zn1.86Mg0.06SiO4:0.08Mn2+的发光强度是商用粉的105%,衰减时间(3.89ms)较商用粉缩短了1.33ms.
A series of Zn1.92-xMgxSiO4: 0.08Mn2 + (0≤x≤0.12) powder samples were successfully synthesized by sol-gel method under different atmospheres.Using X-ray diffraction (XRD), photoluminescence (PL) spectra were used to characterize the structure, unit cell parameters and luminescent properties of the Zn1.92-xMgxSiO4: 0.08Mn2 + phosphors. The results show that the substitution of Mg2 + doped Zn1.92-xMgxSiO4: 0.08Mn2 + Zn2 + ion lattice sites and the formation of MgO4 tetrahedron, MgO4 group due to about 154nm at the absorption, doping appropriate amount of Mg2 + increased the luminous intensity of the sample, Mg optimum doping concentration of about 0.06mol; heat treatment atmosphere significantly affect the phosphor The precursor was heat-treated at 1100 ℃ for 4h under N2 atmosphere and then slowly cooled to 900 ℃. The precursor was heat-treated in a reducing atmosphere of N2 (95%) + H2 (5%). The obtained phosphor had the strongest luminescence intensity The luminescence intensity of Zn1.86Mg0.06SiO4: 0.08Mn2 + obtained by low temperature reduction heat treatment is 105% of the commercial powder, the decay time (3.89ms) is 1.33ms shorter than the commercial powder.