【摘要】 研究了在不同激发波长下三价钐离子掺杂硫氧化钇的发光强度对浓度的依赖关系。研究发现磷光体的发光强度不仅跟激活离子的浓度有关,而且跟激发时所采用的不同激发波长有关。磷光体发光强度与激活剂掺杂量的变化曲线表明,在不同激发路径下磷光体具有不同的发光性质。采用Sm3+离子直接跃迁的413nm对样品进行激发时,发生猝灭的浓度低至约02mol%;当采用263nm高能紫外线激发时,浓度猝灭发生在较高浓度处(～2mol%),后者是前者的10倍。对Sm3+离子发射强度与浓度关系曲线进行了拟合计算,结果表明Sm3+在Y2O2S中浓度猝灭的原因主要是相邻中心的偶极四极相互作用引起的交叉弛豫。更多还原

【Abstract】 The concentration dependence of luminescence under different excitations in Y 2O 2S:Sm 3+ phosphor has been studied. The optimum activator concentration was found to be a function of the number of excited activator ions as well as the excitation wavelength. The concentration dependence curve of Y 2O 2S:Sm 3+ phosphor under 413 nm excitation was different from the curve obtained with 263 nm excitation. For excitation radiation having longer wavelength (413 nm), the concentration quenching of Y 2O 2S:Sm 3+ phosphor occurred at about 2%, which is ten times as the result with shorter wavelength (263 nm) excitation (-0 2%). Fitting the concentration dependence curve and the result shows that the cross relaxation caused by the dipole quadrupole interaction of neighboring Sm 3+ ions results in the concentration quenching.更多还原