Efeitos da atmosfera de síntese e de fluoretos nos parâmetros espectroscópicos de Er3+ em vidros fosfatos

• Ano de defesa: 2020
• Autor(a) principal: Caetano, Marlon
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Física
• Palavras-chave em Português: Vidros fosfatos; Érbio; Teoria de Judd-Ofelt; Dopagem com fluoretos; Atmosfera controlada; Física; Phosphate glasses; Erbium; Judd-Ofelt theory; Doping with fluorides and controlled atmosphere; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DA MATERIA CONDENSADA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/28911; http://doi.org/10.14393/ufu.te.2020.88

In this work, we study the effect of the synthesis atmosphere and / or the addition of LiF or CaF2 on the spectroscopic parameters of Er3+ ions inserted in PAN and PANK Glass Matrices with nominal compositions 60P205 . 10Al2O3 . 30Na2O (mol%) e 40P2O5 . 20Al2O3 . 35Na2O . 5K2O (mol%), respectively, doped with xEr2O3 (x = 0,0 e 1,0 wt%) and/or yLiF (y = 0,0 e 5,0 wt%) and/or zCaF2 (z = 0,0 e 5,0 wt%), synthesized by the fusion method. This study was based mainly on Optical Absorption (AO) spectra in conjunction with Judd-Ofelt Theory (JO), Differential Thermal Analysis (DTA), Raman Spectroscopy (ER), Photoluminescence (PL) and Photoluminescence of Time Resolution (PLRT), as well as the determination of the Refractive Index (n), the density (ρA in g / cm³) and the concentrations of Er3+ ions (N). Synthesis of controlled atmosphere (AC) samples as well as the addition of these fluorides significantly reduced hydroxyl (OH) density and consequently an increase in the 4I13/2 state lifetime and the quantum efficiency of the transition was observed 4I13/2 → 4I15/2 of the Er3+ ions. This compared to samples synthesized under normal atmosphere (AN) or without the addition of LiF or CaF2 in the samples. Based on these results, we conclude that the hydroxyl density (OH) is determinant regarding the Er3+ spectroscopic parameters inserted in the PAN and PANK glass matrices, which can be reduced both in controlled atmosphere (AC) and by adding LiF or CaF2.