Synthesis and photoluminescent study of lead-free A2BIBIIIX6-type double perovskite embedded in boron-germanate glasses

• Grant number: 24/01502-4
• Support Opportunities: Scholarships in Brazil - Master
• Start date: July 01, 2024
• End date: June 30, 2026
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Danilo Manzani
• Grantee: Vinicius Leonardo Souza
• Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 21/08111-2 - Development of rare earth based light converters: luminescent markers, optical sensors, and amplifiers, AP.TEM

Abstract

Lead-Free double perovskites (DPs) represent some of the most promising materials for photonic applications and an important alternative compared to monovalent lead perovskites. However, their incorporation into glasses is still underexplored. In this context, the proposal focuses on the study, synthesis, and characterization of lead-free double perovskite embedded in boron-germanate glasses. The project will be taken into two main stages. First, boron-germanate glass matrix in the system GeO2 - B2O3 - ZnO - Al2O3 containing Cs2NaEuCl6 DP precursors will be obtained by the classical method of fusion followed by annealing. In the second stage, the in-situ growth of DP particles will be conducted through two approaches: (I) controlled thermal treatment above the glass transition temperature (Tg) for the growth of the crystalline phase of perovskites; (II) femtoseconds laser irradiation microfabrication for nucleation of the crystalline phase of DPs followed by thermal treatment for crystal growth. The obtained materials will be characterized in terms of their structural, thermal, and optical properties using different techniques. In this context, the proposal has a pioneering nature, contributing to a research field in the area of glassy materials that is still minimally explored in the state of São Paulo and in Brazil, and its results may contribute to the development of new luminescence-emitting materials for photonic applications.