Transfer of optical excitation energy from Dy 3+ → Nd 3+ in calibo glass

Abstract

A study of energy transfer from trivalent dysprosium to trivalent neodymium in calibo glass has been done. The emission intensity of the 4F 9 2 level of Dy 3+ and the time behavior of its decay with varying acceptor (Nd 3+) concentrations have been studied. The study at low acceptor concentrations has been done in some detail. The dipole-dipole coupling constant ( C) and the diffusion constant ( D) have been calculated. The observed mechanism of energy transfer is electric dipole-dipole. A radiative energy transfer from the 4F 9 2 → 6H 13 2 (575 nm) emission transition of Dy 3+ to 4I 9 2 → 4G 5 2 absorption transition of Nd 3+ was also observed. The study was also carried out at high (493°K) and low (80°K) temperatures. The data at room temperature (290°K) were analyzed to obtain transfer efficiencies and transfer probabilities.