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Tricolor devices based on Ba2SiO4:Eu3+ e/ou Tb3+: sol-gel synthesis and eletrophoretic deposition for W-LEDs application

Grant number: 16/20421-9
Support type:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): February 01, 2017
Effective date (End): August 31, 2019
Field of knowledge:Physical Sciences and Mathematics - 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 scholarship(s):17/21995-1 - Tricolor devices based on Ba2SiO4:Eu3+and/or Tb3+: sol-gel synthesis and eletrophoretic deposition for W-LEDs application, BE.EP.DD

Abstract

White light sources as Light Emitting Diodes (LEDs) are regarded as the next generation of lighting due to the high emission efficiency, longer life time, higher reproducibility of the emitted light, reduction of UV radiation emission and relatively lower temperatures operation compared to fluorescent and incandescent lamps. In LEDs, white light can be obtained by combining red, green and blue phosphors which when excited by a UV or blue light emitting chip generate to the observer a sensation of white light. Phosphors doped with rare earth ions (group of lanthanides included scandium and yttrium), such as Ba2SiO4:Eu3+, Ba2SiO4:Eu2+, Ba2SiO4:Tb3 + and Ba2SiO4:Eu3+, Tb3+ have potential to be applied as components of the emitting layer of white LEDs due to high thermal, electrical and chemical stability. The application of rare earth ions in luminescent materials is usually associated with the ability to replace cations network framing with similar properties in inorganic matrices such as silicates. The synthesis of the phosphors based on silicates, central purpose of this study can be carried out by the sol-gel route, quite a process applied for the production of optically active materials at relatively low temperatures. The sol-gel process is highly versatile, since it allows obtaining a variety of materials such as ceramics, fibers, thin films and glasses. Phosphors prepared from sol-gel route, in turn, can be used in the manufacture of light-emitting films via electrophoretic deposition technique, applicable in the construction of the white LEDs emitting layers, or even screens of televisions or computers. The electrophoretic deposition method is already a standard in literature for the production of white LEDs emitting layer due to the simplicity in obtaining films and enable the deposition of insoluble materials due to the interaction of charges on the surface of an external electric field. Thus the aim of this project is to investigate the structural, morphological and spectroscopic properties of silicates doped with Eu3 +, Eu2+ or Tb3 + and codopaded with Eu3 + and Tb3 + in different percentages, synthesized via sol-gel from barium acetate and TEOS (tetraethoxysilane). After synthesis and modulation of systems properties, it is also desired the production of luminescent films using electrophoretic deposition technique applicable in emitting layer of white LEDs or so in mobile displays, computers or television sets. (AU)

Scientific publications (8)
(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: 1.
BISPO-JR, AIRTON G.; LIMA, SERGIO A. M.; CARLOS, LUIS D.; FERREIRA, RUTE A. S.; PIRES, ANA M. Red-Emitting Coatings forMultifunctional UV/Red Emitting LEDs Applied in Plant Circadian Rhythm Control. ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY, v. 9, n. 1 SEP 20 2019. Web of Science Citations: 0.
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, JULY 2019. Web of Science Citations: 0.
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: 10.
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: 11.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
JÚNIOR, Airton Germano Bispo. Light-emitting diodes based on Eu3+, Eu2+ or Tb3+-doped silicates for lighting and Circadian rhythm regulation. 2019. Doctoral Thesis - Universidade Estadual Paulista "Júlio de Mesquita Filho" Instituto de Biociências, Letras e Ciências Exatas..

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