Caracterização óptica de vidros PZABP dopados com Yb3+ e nanocristais de ZnTe

Abstract

The main objective of this work is to investigate the interactions between those systems and their potential to technological applications. The glassy hosts studied here were produced by Prof. Noelio 0. Dantas in the National Labora-tory of New Insulating Materials and Semiconductors (LaboratOrio Nacional de No-vos Materiais Isolantes e Semicondutores) (LNMIS), at Universidade Federal de Uberlandia. Two sets of samples were made with the glass nominal composition of 60P205 + 15ZnO + 5Al203 + 10Ba0 + 10Pb0 + [xYb2)3(mol%)). In one set, the ytterbium doping varies from 0% to 10% adding 1% to each sample. The other set the ytterbium doping varies from 0% to 5% in addition to 1% Te. The powders were first mixed and then fused at 1300°C for 30 min and finally cooled to 350°C. Two groups of different average sizes of ZnTe NCs were obtained during the cooling of the melt from 1300°C to 350°C through the process of diffusion of ions of Zn2+ and Tee-. The spectroscopic evaluation of both sets were made using the photolu-minescence, time solved photoluminescence and absorption techniques focusing in the 980nm ytterbium transition. Theory of Fuchtbauer-Ladenburg were applied fo the data analysis in order to evaluate the transition radiative rate and quantum efficiency. The collected data show energy transfer between the Yb ions and the ZnTe nanocrystals, achieving a 500% enhancement of the luminescence intensity.