碱土金属钛酸盐中镨离子的光谱特性

Spectral Characteristics of Pr^(3+) in Titanate

采用高温固相反应法,在空气中合成了Pr3+激活的碱土金属钛酸盐磷光体:MTiO3:Pr3+(M:Ca,Sr,Ba).系统地研究了Pr3+在MTiO3中光谱性质.发现,1D2→3H4跃迁发射(613 nm)强度随Ca2+→Sr2+→Ba2+半径增大而降低.体系中加入Al3+,Pr3+的613 nm发射强度都有不同程度的增强,这种增强除电荷补偿作用外,能量传递可能也是主要因素.这一结果为提高Pr3+红光发射强度提供了实验途径.另外,确定稀土离子Pr3+在CaTiO3基质中的自身浓度猝灭机理为电偶极—偶极相互作用.

The luminescent materials MTiO3 ：Pr^3＋ （M： Ca, Sr, Ba） were synthesized by high temperature solid state reaction in air atmosphere . Spectral properties of Pr^3 ＋ in MTiO3 were studied systematically. It was found that the emission strength（613 nm）of D2→^3H4 transition was reduced with the increase of ionic radius in the order of Ca^2＋ , Sr^2＋ , Ba^2＋ . The emission enhancement（613 nm）of the Pr^3＋ ions by Al addition had been investigated. It was concluded that the function of energy transfer played more important roles in the emission enhancement than that of charge compensation. These results provided an experimental pathway by which a red light emission enhancement of Pr^3 ＋ could be realized. In addition, it was determined that the mechanism of concentration self-quenching of Pr^3＋ in CaTiO3 was dipole-dipole interaction.