Investigação da eficiência quântica de luminescência pela teoria de Judd-Ofelt : aplicação aos vidros aluminosilicato de cálcio dopados com érbio

Abstract

In this work, we have studied the Judd Ofelt theory in order to use it as a tool for spectroscopic characterization for glasses produced by our group. We have analyzed the main aspects of model approximations, which has as purpose to explain the transitions in the 4f layer of the Rare Earth ions under the action of the glassy matrix crystal field, which by the selection rules of quantum mechanics are forbidden. We studied the application of the Judd Ofelt theory in the luminescent properties analysis of the calcium aluminosilicate glasses doped with 0,5wt% of Erbium (Er3+), varying its silica concentration from 7wt% to 55wt%. We have focused on the ion Er3+ transition region at 1535 nm, widely used in the production of laser and optic fiber. This region is called "third window" of optical transmission. Using ions by cubic centimeters measures, index of refraction, absorption spectrum and application of Judd Ofelt theory we achieved 94% for the quantum efficiency of the state 4I13/2 (E ~ 6667cm-1 → λ= 1,5 μm) of this glasses. The result is in agreement with the properties of the dopant, as the stability in ionic form Er3+ not showing other valencia state, and also by the minimal energy lose in its meta state 4I13/2.