Spectral migration of excitation energy among Nd~(3+) ions in fluoroarsenate glasses

摘要

In this work, we have investigated the existence of energy transfer among Nd~(3+) ions in fluoroarsenate glasses of the Na_4As_2O_7, BaF_2, YF_3 system with different Nd~(3+) concentrations (0.5, 2,3,4, and 5 mol%) by using time-resolved fluorescence line narrowing spectroscopy. The spectral features of the time resolved fluorescence line narrowing ~4F(3/2)->~4I_(9/2) emission spectra obtained under resonant excitation reveal the existence of spectral migration of excitation among the Nd~(3+) ions. The analysis of the time evolution of the ~4F_(3/2)->~4I_(9/2) narrowed emission shows that the electronic mechanism responsible for the ion-ion interaction canbe identified as a dipole-dipole energy transfer process.