【摘要】 研究了紫外线激发下,Tb³⁺离子激活的(Y_1-nLa_n)₂O₂S、(Y_1-nGd_n)₂O₂S和(Gd_1-nLan)₂O₂S三个二元体系的发光光谱、发光亮度和发光颜色等性能随着基质组成变化的规律性,并与阴极射线激发下的发光性能进行了对比。更多还原

【Abstract】 Tb³⁺-doped oxysulfides of lanthanum, yttrium and gadolinium are good cathodoluminophors. In order to find still more efficient phosphors, we have investigated the luminescent properties of some Tb-doped solid solutions of rare earth oxysulfides. A series of samples of the systems of (Y_1-nLa_n)₂O₂S:Tb, (Gd_1-nLa_n)₂O₂S:Tb and (Y_1-nGd_n)₂O₂S:Tb have been prepared by high temperature sulfidization of the corresponding rare earth oxides. Their luminescent properties under UV light excitation have been measured and discussed. The emission spectra of these solid solutions consist of multiple sharp lines, which can be assigned to the ⁵D₉→⁷F_J and ⁵D₄→⁷F_J transitions of the Tb³⁺ ion As Y, Gd were substituded by La in (Y_1-nLa_n)₂O₂S:Tb and (Gd_1-nLa_n)₂O₂S:Tb systems, the emission intensity of ⁵D₃→⁷F_J transition of Tb³⁺ decreased obviously In（Y（7-n）Gd_n）₂O₂S:Tb system as the concentration of Gd increased, the emissions of ⁵D₄→⁷F_J transiton began to be the main emission. The composition-dependence of the luminous brightness and chromaticity coordinates of these systems were found. In binary systems of (Y_1-nGd_n)₂O₂S:Tb as Y was successively substituted by Gd, the luminous brightness gradually increased. As Y and Gd were substituded by La successively in the systems of (Y_1-nLan2O₂S:Tb and (Gd_1-nLa_n)₂O₂S:Tb, the luminous brightness went up at first and then changed along a downwards concave curve Some of the above results have been compared with these properties of cathodo-luminescence.更多还原