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Synthesis and characterization of LaNbO4:Eu3+, Bi3+ doped matrix obtained by spray pyrolysis process

Grant number: 11/15757-4
Support type:Regular Research Grants
Duration: January 01, 2012 - December 31, 2013
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Lucas Alonso Rocha
Grantee:Lucas Alonso Rocha
Home Institution: Pró-Reitoria Adjunta de Pesquisa e Pós-Graduação. Universidade de Franca (UNIFRAN). Franca , SP, Brazil


White light-emitting diode (LED) is considered as the next generation soli-sate light sources for substituting the widely used incandescent lamps and fluorescent lamps, due to its advantages such as long lifetime, low energy consumption and environmental protection. The commercial red-emitting phosphor is Y2O2S:Eu3+, however it has lower efficiency compared with that of blue and green phosphors, shorter working lifetime under UV irradiation, and instability due to releasing of sulfide gas. For these reasons, the development of new process and the search for new materials is indispensible to obtain phosphors that are more efficiently in absorption UV radiation and adequate stability. 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.This project, LaNbO4:Eu3+, Bi3+ matrix will be prepared by spray pyrolysis in order to obtain a new phosphors red-emitting. 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)
DE CAMPOS, BEATRIZ M.; FREIRIA, GABRIELA S.; CIUFFI, KATIA J.; DE FARIA, EMERSON H.; ROCHA, LUCAS A.; NASSAR, EDUARDO J.; DE LIMA, MILTON S. F. ITO Obtained by Spray Pyrolysis and Coating on Glass Substrate. Journal of the Brazilian Chemical Society, v. 28, n. 12, p. 2412-2420, DEC 2017. Web of Science Citations: 2.
MATIAS, CARLOS R.; NASSAR, EDUARDO J.; VERELST, MARC; ROCHA, LUCAS A. Synthesis and Characterization of Nb2O5:La3+,Eu3+ Phosphors Obtained by the Non-Hydrolytic Sol-Gel Process. Journal of the Brazilian Chemical Society, v. 26, n. 12, p. 2558-2570, DEC 2015. Web of Science Citations: 9.
MIURA, BARBARA A.; FERREIRA, NATALIA H.; OLIVEIRA, POLLYANNA F.; DE FARIA, EMERSON H.; TAVARES, DENISE C.; ROCHA, LUCAS A.; CIUFFI, KATIA J.; NASSAR, EDUARDO J. Functionalization of luminescent YVO4:Eu3+ nanoparticles by sol-gel. Journal of Luminescence, v. 159, p. 93-99, MAR 2015. Web of Science Citations: 12.

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