Síntese e caracterização óptica e estrutural de vidros fosfato co-dopados com nanopartículas de prata e neodímio

Abstract

Phosphate glasses stand out for their high optical transmittance, low melting temperature, high capacity for dopant incorporation, and excellent chemical stability. The possibility of structural modification through additives and co-doping with neodymium ions (Nd³⁺) and silver nanoparticles (AgNPs) enables the development of materials with enhanced photonic properties, such as higher emission efficiency and broader absorption spectral range. These characteristics make these glasses promising for applications in solid-state lasers, optical sensors, photonic converters, biomedical devices, solar concentrators, and protective coatings, highlighting their strategic potential for the advancement of emerging technologies. In this study, the melt-quenching technique was used to synthesize phosphate glass, with a focus on analyzing its optical properties. The glass composition was varied under three conditions: (55 - x - y) NH4H2PO5 + 30Na2O + 10Al2O3 + 5ZnO + xAgNO3 + yNd2O3 with x and y values varying, respectively, as follows: (x: 0,00%; 0,25%; 0,50%; 0,75%; 1,00%; 2,00%. e y: 0,00%; 0,50%). After preparing the glasses, characterizations were performed using mid-infrared (MIR) spectroscopy, near-infrared (NIR) spectroscopy, UV-Vis spectroscopy, luminescence measurements, and Raman spectroscopy. These analyses were conducted to determine the absorption coefficient, the material band gap energy, and to investigate energy transfer between silver nanoparticles and rare-earth ions. The results obtained from these characterizations form the basis of this work, aiming to identify possible applications of these glasses in light-emitting devices.