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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Multicolor-emitting luminescent Y2O3:RE3+@SiO2-[RE3+(beta-diketone)(3)] core@shell hybrids featuring dual RE3+ activator centers

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Autor(es):
Costa, Andre L. [1, 2] ; Bispo-Jr, Airton G. ; Lima, Sergio A. M. [3] ; Pires, Ana M. [4, 5, 3]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ Unesp, Inst Biosci Humanities & Exact Sci, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[2] Sao Paulo State Univ Unesp, Sch Sci & Technol, R Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil
[3] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ Unesp, Sch Sci & Technol, R Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil
[4] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ Unesp, Inst Biosci Humanities & Exact Sci, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[5] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ Unesp, Inst Chem, BR-14800900 Araraquara, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Journal of Alloys and Compounds; v. 843, NOV 30 2020.
Citações Web of Science: 0
Resumo

Luminescent inorganic-organic hybrids find several applications such as in multifunctional devices or in bioimaging. In this regard, through a step-by-step process, inorganic-organic core@shell-like hybrids based on spherically-shaped Y2O3:Eu3+@SiO2-{[}Tb(acac)(3)(Salen)] or Y2O3:Tb3+@SiO2-{[}Eu(dbm)(3)(Salen)] particles with diameter of 170 nm were fabricated from Y2O3:RE3+ (RE3+ = Eu3+ or Tb3+) coated with a layer of SiO2 (2.7 nm), that was amino-functionalized, followed by imino-functionalization to get Salen ligands to which were finally bonded to {[}RE(beta-diketonate)(3)] complexes (beta-diketonate = acetylacetonate, acac, or dibenzoylmethanate, dbm). The core@shell architecture of the hybrids was confirmed by X-ray diffraction, FTIR and TEM. By changing the excitation pathways, the overall emitted color of both hybrids is tuned from green (Tb3+ emission) to red spectral region (Eu3+ emission), crossing the white color emission region due to the combination of the Eu3+, Tb3+ and Salen emissions. As an additional and interesting find, no energy transfer from the RE3+ in the core to the other RE3+ on the particle surface takes place, avoiding the quenching of both RE3+ luminescence. Therefore, the high D-5(0) state quantum efficiency of Eu3+ (68%) and the multicolor emission qualify the hybrids for future photonic applications in multifunctional devices or in bioimaging. (C) 2020 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 16/20421-9 - Dispositivos tricromáticos a base de Ba2SiO4:Eu3+ e/ou Tb3+: síntese sol-gel e deposição eletroforética visando aplicação em LEDs brancos
Beneficiário:Airton Germano Bispo Júnior
Linha de fomento: Bolsas no Brasil - Doutorado Direto