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

Autor(es)

Costa, Andre L. ^{[1, 2]} ; Bispo-Jr, Airton G. ; Lima, Sergio A. M. ^[3] ; Pires, Ana M. ^{[4, 5, 3]}

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

• 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
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto