BaLaB9O16中Ce3+敏化Dy3+发光的机理

在紫外光激发下,研究了BaLaB₉O₁₆中Dy³⁺、Ce³⁺的发光光谱、激发光谱、发光强度及荧光寿命随着组成变化的规律性.结果表明;De³⁺对Dy³⁺的发光有相当强的敏化作用,Ce³⁺→Dy³⁺的能量传递效率可高达93%,能量传递的机理为电偶极-偶极相互作用的共振传递.根据349nm激发下Dy³⁺发光强度与浓度的关系,证明了Dy³⁺发光的自身浓度猝灭机理也为电偶极-偶极相互作用.

MECHANISM OF LUMINESCENT SENSITIVITY OF Ce3+TO Dy3+IN BaLaB9O16

The photoluminescent emission spectra, excitation spectra,and dcpendence of luminescent intensity and decay time of Dy³⁺and Ce³⁺on the compositions of compounds are stlldied systematically.The experiments show that the Ce³⁺can strongly enhance the luminescence of Dy³⁺,and the efficiency of energy transfer from Ce³⁺to Dy³⁺is as high as 93%.The results indicate that the mechanism of energy transfer is the resonance transfer by electric dipole-dipole interaction. According to the concentration dependence of Dy³⁺on emission intensity, it is proved that the concentration quenching of Dy³⁺itself is also caused by the electric dipole-dipole interaction.