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本文首次较系统地研究了稀土离子Sm~(3+)、Dy~(3+)、Ho~(3+),Er~(3+)、Tm~(3+)在具有不同结构的M_2YSbO_6(M=Ba、Ca)中的发光性能。合理地确定了各种谱项及跃迁。发现稀土离子的发光强烈地依赖于复合氧化物的晶体结构及其掺杂浓度。浓度猝灭是由于稀土激活离子对之间交叉驰豫无辐射跃迁所致。从实验上,确定了某些稀土离子发光的最佳浓度。结果表明Ca_2YSbO_6对Sm~(3+)、Dy~(3+)、Ho~(3+)、Er~(3+)是一个有效的基质并对激活离子具有敏化作用。发现重稀土激活离子Dy~(3+)黄光发射强度和兰光发射强度之比R随Dy~(3+)浓度的增加发生规律性的变化。并解释了其原因。
In this paper, we firstly systematically studied the effects of rare earth ions Sm ~ (3 +), Dy ~ (3 +), Ho ~ (3 +), Er ~ (3 +) and Tm ~ (3+) on the structures of M_2YSbO_6 M = Ba, Ca). All kinds of spectrum items and transitions have been rationally determined. It was found that the luminescence of rare earth ions strongly depends on the crystal structure of the complex oxide and its doping concentration. Concentration quenching is due to the rare-earth activated ion-pair cross-relaxation due to non-radiative transitions. Experimentally, we determined the best luminescence concentration of some rare earth ions. The results show that Ca 2 YSbO 6 is an effective matrix for Sm 3+, Dy 3+, Ho 3+ and Er 3+ and sensitizes activated ions. It is found that the ratio R of the emission intensity of yellow light to the emission intensity of Dy 3+ light intensity changes regularly with the increase of Dy 3+ concentration. And explained the reason.