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LbL luminescent thin films of rare earth doped Ba2SiO4 obtained via sol-gel for White LED application

Grant number: 15/10394-1
Support type:Scholarships in Brazil - Master
Effective date (Start): August 01, 2015
Effective date (End): January 31, 2017
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

Abstract

White light sources as light emitting diodes (LEDs) are regarded as next-generation lighting because of 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 is obtained by combining red, green, and yellow phosphors in addition to a blue emitting layer and when simultaneously emit light the observer has the perception of white light. Phosphors doped with rare earth ions (group that includes lanthanides plus scandium and yttrium), such as Ba2SiO4: Eu3 +, Ba2SiO4: Tb3 + and Ba2SiO4: Eu3 +, Tb3 + have potential to be applied as components of the emitter layer of white LEDs, and displays screens, cell imaging, solid state lasers, or chemical sensors. The application of rare earth ions in luminescent materials is generally associated with the ability to replace cations with similar properties in inorganic matrices as silicates. Silicates are groups of the basic inorganic compounds of silicon and oxygen that may be classified according to how the SiO44- tetrahedra are bound together, forming a lattice that can be deformed due to the presence of a dopant ion such as Eu3 + or Tb3 +. The simplest silicates, orthosilicates, are built by isolated tetrahedral units SiO44- and electrical neutrality is provided by cations regularly spaced along the chain. The synthesis of a silicate-based phosphor, such as the materials proposed in this work, can be carried out by the sol-gel route, a process well applied for the synthesis of materials with optical properties at relatively low temperatures. The sol-gel process is quite important in several research areas, as it allows obtaining a series of materials such as ceramics, fibers, thin films and glasses. The proposed materials obtained by sol-gel pathway can be used in the manufacture of thin film technique via layer-by-layer, creating a system which can be applied in the layer emitting white LEDs, as well as screens for televisions or computers. Thus, the purpose of this work is to investigate the structural, morphological and spectroscopic doped silicate with Eu3 + or Tb3 + and co-doped with Eu3 + and Tb3 + in different percentages, synthesized via sol-gel from barium acetate and TEOS (tetraethoxysilane). After synthesis and modulation of system properties is also intended the luminescent manufacturing of nanostructured thin films using the layer-by-layer technique and the cationic polymer PAH (polyallylamine Hydrochloride) aiming emitting layer application such as white LEDs or else in displays mobile phones, computers or television sets.

Scientific publications (9)
(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.
RAYMUNDO-PEREIRA, PAULO A.; CECCATO, DIEGO A.; JUNIOR, AIRTON G. B.; TEIXEIRA, MARCOS F. S.; LIMA, SERGIO A. M.; PIRES, ANA. M. Study on the structural and electrocatalytic properties of Ba2+- and Eu3+-doped silica xerogels as sensory platforms. RSC ADVANCES, v. 6, n. 106, p. 104529-104536, 2016. Web of Science Citations: 5.

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