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Optical and Structural effects of Eu(III) doping ion concentration in the Ba2SiO4 host lattice synthesized via sol-gel method.

Grant number: 12/13876-9
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2012
Effective date (End): February 28, 2015
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
Principal Investigator:Ana Maria Pires
Grantee:Airton Germano Bispo Júnior
Home Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
Associated research grant:07/00880-0 - Rare earth luminescent nano reporters and probes, AP.JP


With the progress of science and technology, the study and application of new materials have become more frequent. An example of application of these new materials is luminescent devices LED (Light Emitting Diodes) and OLED (Organic Light Emitter Diode). Matrices based on inorganic silicates synthesized by sol-gel and activated with rare earth ions (Group of Lanthanides that includes scandium and yttrium), especially Eu (III), have potential application in the preparation of luminescent materials usable for the production of modified electrodes, in the manufacture of lasers or directly as luminescent markers. The rare earth elements are constantly being investigated because of their luminescent properties related to the existence of many metastable levels that lead to radiative transitions from the ultraviolet to the near infrared region. In the trivalent rare earths, such as Eu (III), light emission occurs due to the internal optical transitions between f sublevels. The use of rare earth ions is usually associated with its ability to replace cations with similar properties in inorganic host lattices such as silicates. The silicates are the inorganic groups of compounds based on silicon and oxygen that can be classified according to the shape that SiO44- tetrahedrons bind each other to form a crystal lattice that can be distorted due to the presence of doping ions such as Eu(III). The simplest silicates, the orthosilicates, are built as tetrahedral units of isolated SiO44- and the electrical neutrality is provided by cations regularly spaced along the chain. The synthesis of a phosphor based on silicates, such as Ba2SiO4: Eu (III) can be carried out by the sol-gel methodology, a process that is applied to provide optical materials under low temperatures synthesis. The sol-gel process has great importance in many areas; it allows the preparation of a variety of materials such as fibers, thin films and glass. The objective of present study is to investigate the optical properties of barium silicate doped with Eu(III) in different percentages synthesized by sol-gel from barium acetate and TEOS (tetraethoxysilane) activated with Eu(III) varying the synthesis conditions such as catalyst, temperature, and also to study the effect of the calcination temperature of the xerogel obtained. The aim is to investigate the structural characteristics of the system (sites occupied by Eu(III) in the silicate array) monitoring the possible properties that could arise in the process searching for useful applications for these phosphors with specific features.

Scientific publications (7)
(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)
BISPO-JR, A. G.; LIMA, S. A. M.; LANFREDI, S.; PRAXEDES, F. R.; PIRES, A. M. Tunable blue-green emission and energy transfer properties in Ba2SiO4:Tb3+ obtained from sol-gel method. Journal of Luminescence, v. 214, OCT 2019. Web of Science Citations: 2.
LEITE SILVA, CAMILA M. B.; BISPO-JR, AIRTON G.; CANISARES, FELIPE S. M.; CASTILHO, SHIRLEY A.; LIMA, SERGIO A. M.; PIRES, ANA M. Eu3+-tetrakis beta-diketonate complexes for solid-state lighting application. LUMINESCENCE, v. 34, n. 8 JULY 2019. Web of Science Citations: 1.
BISPO-JR, AIRTON GERMANO; PIRES, ANA MARIA; MARQUES LIMA, SERGIO ANTONIO; CARDOSO, CELSO XAVIER. Evaluation of cryo-treatment in the luminescent properties of PVDF/Eu2O3 composite obtained by using buriti oil as additive. SOLID STATE SCIENCES, v. 92, p. 24-30, JUN 2019. Web of Science Citations: 0.
BISPO-, JR., AIRTON GERMANO; MARQUES SHINOHARA, GABRIEL MAMORU; PIRES, ANA MARIA; CARDOSO, CELSO XAVIER. Red phosphor based on Eu3+-doped Y-2(MoO4)(3) incorporated with Au NPs synthesized via Pechini's method. Optical Materials, v. 84, p. 137-145, OCT 2018. Web of Science Citations: 2.
BISPO-JR, AIRTON GERMANO; OLIVEIRA, NAGYLA ALVES; CARDOSO, CELSO XAVIER; MARQUES LIMA, SERGIO ANTONIO; JOB, ALDO ELOIZO; OSORIO-ROMAN, IGOR ORLANDO; DANNA, CAROLINE SILVA; PIRES, ANA MARIA. Red-light-emitting polymer composite based on PVDF membranes and Europium phosphor using Buriti Oil as plasticizer. Materials Chemistry and Physics, v. 217, p. 160-167, SEP 15 2018. Web of Science Citations: 3.
BISPO-, JR., AIRTON G.; LIMA, SERGIO A. M.; PIRES, ANA. M. Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route. Journal of Luminescence, v. 199, p. 372-378, JUL 2018. Web of Science Citations: 11.
BISPO, JR., AIRTON G.; CECCATO, DIEGO A.; LIMA, SERGIO A. M.; PIRES, ANA. M. Red phosphor based on Eu3+-isoelectronically doped Ba2SiO4 obtained via sol-gel route for solid state lightning. RSC ADVANCES, v. 7, n. 85, p. 53752-53762, 2017. Web of Science Citations: 8.

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