Phosphors-RGB obtained by the spray pyrolysis process

• Grant number: 14/24658-8
• Support Opportunities: Scholarships in Brazil - Master
• Start date: March 01, 2015
• End date: February 28, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Lucas Alonso Rocha
• Grantee: Gabriela Simões Freiria
• Host Institution: Pró-Reitoria Adjunta de Pesquisa e Pós-Graduação. Universidade de Franca (UNIFRAN). Franca , SP, Brazil

Abstract

White Light-Emitting Diode (LED) is considered as the next generation soli-sate light sources, for generating white light from red, green and blue (RGB) phosphors to replace the widely used incandescent lamps and fluorescent lamps, due to its advantages such as long lifetime, low energy consumption and environmental protection. The development of new processes and the search for new materials is essential for obtaining phosphors that absorb radiation efficiently in the ultraviolet region and having adequate stability and emission in the visible region. Among different ways for the preparation of phosphors materials, one of the most promising is the Evaporation Induced Self Assembly (EISA) process that involves progressive concentration of non-volatile species. Spray pyrolysis is a method of producing particles, in which a vaporized stream of precursor solution is dried, precipitated, and decomposed in a tubular furnace reactor. During the process the reaction and aggregation volume are confined within a micrometric droplet, which contains precursors of the same stoichiometry as desired in the product. Furthermore, the solvent evaporation is complete within a few seconds which is the contrary to currently available methods that require several hours or up to several days to complete the process.In this project, spherical nanoparticles of LaNbO4 doped ions Eu3 +, Dy3 + will be prepared by the SP process for obtaining RGB phosphors that emit in the visible region. In addition, the study of the structural properties/morphology and luminescent properties is very important to the development of new luminescent materials. (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)

FREIRIA, GABRIELA S.; RIBEIRO, AMANDA L.; VERELST, MARC; NASSAR, EDUARDO J.; ROCHA, LUCAS A.. Effect of Dy3+ Amount on the Structural and Luminescence Properties of LaNbO4:Dy3+ Phosphor Obtained by One-Step Spray Pyrolysis Process. Journal of the Brazilian Chemical Society, v. 29, n. 3, p. 594-601, MAR 2018. (15/20298-0, 14/24658-8)

FREIRIA, GABRIELA S.; RIBEIRO, AMANDA L.; VERELST, MARC; NASSAR, EDUARDO J.; ROCHA, LUCAS A.. Effect of Dy3+ Amount on the Structural and Luminescence Properties of LaNbO4:Dy3+ Phosphor Obtained by One-Step Spray Pyrolysis Process. Journal of the Brazilian Chemical Society, v. 29, n. 3, p. 8-pg., 2018-03-01. (14/24658-8, 15/20298-0)