Development of MI2MIISn3O8 and MI1.6MII1.6Sn2.8O8 stannate materials doped with rare earth ions with persistent luminescence emission

• Grant number: 20/10228-2
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Effective date (Start): November 01, 2020
• Effective date (End): October 31, 2024
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Hermi Felinto de Brito
• Grantee: Matheus Salgado de Nichile Saula
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The rare earth ions (TR3+) have intrinsic optical and chemical properties, mainly due to their intraconfigurational electronic transitions 4f-4f that lead to thin bands of absorption and emission. These spectroscopic characteristics result in their application in lasers, bioimaging for medical diagnostics, LEDs, security systems, luminescent inks, anti-counterfeiting labels, thermometric sensors, etc. Materials doped with TR3+ ions that exhibit the phenomenon of persistent luminescence are capable of emitting light for up to more than 24 hours after the excitation ceases. In particular, materials with persistent luminescence in the Near Infrared (NIR) region have been attracting attention for applications in the areas of biological mapping, photodynamic therapies and medical diagnoses, since this emission corresponds to the spectral region with the highest transmittance in biological tissues. However, most of the materials that present the phenomenon of persistent luminescence in the NIR use matrices of gallium and germanium with high production cost. In this sense, materials containing stannate matrices (MI2MIISn3O8 and MI1,6MII1,6Sn2,8O8) doped with TR3+ ions are economically more attractive and also have a high application potential. Thus, this research proposal aims to synthesize and characterize MI2MIISn3O8: TR3 + and MI1.6MII1.6Sn2.8O8 stannate-based materials: TR3+ (MI: Li, Na and K; MII: Mg, Ca, Sr, Ba, Zn and Cd; TR3 +: from Ce to Yb) to investigate their photoluminescent properties. Therefore, the project seeks to develop the mechanisms of persistent luminescence of these materials aiming at possible applications as photonic devices (for example, in the NIR region). (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE CARVALHO, JOSE MIRANDA; SANTOS PEDROSO, CASSIO CARDOSO; DE NICHILE SAULA, MATHEUS SALGADO; FRANCA CUNHA FELINTO, MARIA CLAUDIA; DE BRITO, HERMI FELINTO. Microwave-Assisted Preparation of Luminescent Inorganic Materials: A Fast Route to Light Conversion and Storage Phosphors. Molecules, v. 26, n. 10, MAY 2021. (20/10228-2, 17/05195-5)