SYNTHESIS AND CHARACTERIZATION OF THE GdVO4 MATRIX DOPATED WITH LANTHANIDES IONS USING THE NON-HYDROLYTIC SOL-GEL METHODOLOGY

• Grant number: 24/03630-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: July 01, 2024
• End date: December 31, 2024
• Field of knowledge: Engineering - Chemical Engineering - Chemical Technology
• Principal Investigator: Eduardo José Nassar
• Grantee: Arielly Oliveira Faria
• Host Institution: Pró-Reitoria Adjunta de Pesquisa e Pós-Graduação. Universidade de Franca (UNIFRAN). Franca , SP, Brazil

Abstract

Systems that can be used as temperature sensors and detect minimal temperature variationsare important in several areas, including medical, and identify biological anomalies. In thiscontext, devices based on lanthanide ions, which present thermally excited levels, can be tomeasure these variations. The non-hydrolytic sol-gel methodology has been presented as analternative to prepare of the mixed oxides doped with lanthanide ions resulting in systemsthat intensify the spectroscopic properties of these ions. The present work aims to synthesizegadolinium vanadate doped with neodymium III (Nd3+) and erbium III (Er3+) ions, and tostudy the upconversion. Initially, the molar ratios between the precursors gadolinium III andvanadate ions will be studied. In a second stage, studies will be on the molar ratios betweenthe sensitizing ion Nd3+ and the emitting ion Er3+. The properties of these ions are essentialin several technologies, such as electronics to medicine. The Nd3+ Er3+ ions are widely usedas dopant in lasers and nanothermometers due to their ability to emit light at specificwavelengths, generally in the visible and infrared. The GdVO4:Nd3+:Er3+ matrix will beobtained by studying of the molar ratio and heat treatment time. The characterizations willbe through thermal analysis, scanning electron microscopy, X-ray diffraction, vibrationalspectroscopy, zeta potential and photoluminescence with an emphasis on upconversion.