Red phosphor based on Eu3+-doped Y-2(MoO4)(3) incorporated with Au NPs synthesized via Pechini's method

Autor(es)

Bispo-, Jr., Airton Germano ^{[1, 2]} ; Marques Shinohara, Gabriel Mamoru ^[1] ; Pires, Ana Maria ^{[1, 2]} ; Cardoso, Celso Xavier ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Sch Technol & Sci, UNESP, R Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil

^[2] Sao Paulo State Univ, Inst Biosci Humanities & Exact Sci, UNESP, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Optical Materials; v. 84, p. 137-145, OCT 2018.
• Citações Web of Science: 2

Resumo

Structural, morphological and spectroscopic characterization of the Eu3+-doped Y-2(MoO4)(3) red phosphor incorporated with Au nanoparticles (Au NPs) synthesized via Pechini's method is reported in the present study. In order to evaluate the Au NPs and Eu3+ ions influence on the molybdate structure, the Y-2(MoO4)(3), Y-2(MoO4)(3):Eu3+, Y-2(MoO4)(3)/Au and Y-2(MoO4)(3):Eu3+/Au samples were produced and fully investigated. All samples obtained at relatively low temperature, i.e., 650 degrees C, show molybdate as the unique phase with high crystallinity assisted by both Eu3+ ions and Au NPs. Water molecules detected in the molybdate structure probably are distorting MoO4, YO6 and EuO6 polyhedra similarly to the Au NPs incorporated in the same lattice. These Au NPs are spherical-shaped with a diameter near to 46 nm and they are located on the molybdate particle surface. The Eu3+-doped phosphors, with or without the presence of Au NPs, exhibit intense red luminescence characteristic of the Eu3+ ion inserted in low-symmetry sites. However, the Au NPs increase the radiative emission rate and absolute quantum yield of the Eu3+ D-s(o) emitter state due to the excitation field enhancement caused by the local surface plasmon resonance absorption effect of gold nanoparticles, which was confirmed by diffuse reflectance measurements. Finally, the Eu3+ quantum efficiency enhancement to 92% played by the gold nanoparticles and the high red color purity qualify the obtained phosphor for photonic applications. (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
• Processo FAPESP: 15/10394-1 - Filmes LBL luminescentes de Ba2SiO4 dopado com terras raras obtido via sol-gel para aplicação em LEDs brancos
• Beneficiário: Airton Germano Bispo Júnior
• Linha de fomento: Bolsas no Brasil - Mestrado
• Processo FAPESP: 12/13876-9 - Efeitos ópticos e estruturais da variação da concentração do íon dopante Eu(III) na matriz Ba2SiO4 sintetizada via sol-gel
• Beneficiário: Airton Germano Bispo Júnior
• Linha de fomento: Bolsas no Brasil - Iniciação Científica