Y_2O_2S:Sm^(3+)发光材料在不同激发波长的浓度特征  

Concentration Dependence of Luminescence under Different Excitation Wavelength in Y_2O_2S:Sm^(3+) Phosphor

作　　者：雷炳富[1] 刘应亮[2] 唐功本 叶泽人[1] 石春山[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理重点实验室,吉林长春130022 [2]广州暨南大学化学系,广东广州510632

出　　处：《光谱学与光谱分析》2004年第11期1302-1305,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(50072031;59982003);广东省自然科学基金(013201)资助项目

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。The concentration dependence of luminescence under different excitations in Y2O2S:Sm3+ 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 Y2O2S:Sm3+ 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 Y2O2S:Sm3+ 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 Sm3+ ions results in the concentration quenching.

关 键 词：激发波长 浓度猝灭 四极相互作用 磷光体 离子 发光强度 高能 激活 变化曲线 紫外线 

分 类 号：O657.37[理学—分析化学] O572[理学—化学]