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Impact of Tb3+ ion concentration on the morphology, structure and photoluminescence of Gd2 O2 SO4 :Tb3+ phosphor obtained using thermal decomposition of sulfate hydrate.
Rodrigues, R V; Marciniak, L; Khan, L U; Muri, E J B; Cruz, P C M; Matos, J R; Strȩk, W; Marins, A A L.
Afiliação
  • Rodrigues RV; São Paulo University, São Paulo, Brazil.
  • Marciniak L; Department of Chemistry, Federal University of Espirito Santo, Vitória, Brazil.
  • Khan LU; Institute of Low Temperature and Structure Research, Wroclaw, Poland.
  • Muri EJB; Brazilian Nanotechnology National Laboratory (LNNano), Campinas, Brazil.
  • Cruz PCM; Department of Chemistry, Federal University of Espirito Santo, Vitória, Brazil.
  • Matos JR; Department of Physic, Federal University of Espirito Santo, Vitória, Brazil.
  • StrÈ©k W; São Paulo University, São Paulo, Brazil.
  • Marins AAL; Institute of Low Temperature and Structure Research, Wroclaw, Poland.
Luminescence ; 35(8): 1254-1263, 2020 Dec.
Article em En | MEDLINE | ID: mdl-32500616
Gadolinium oxysulfate doped with terbium (Gd2 O2 SO4 :Tb3+ ; 0.1, 1.0, and 10.0 mol%) materials were obtained using thermal decomposition from sulfate hydrate under a dynamic air atmosphere and between 1320-1400 K. The materials were characterized using Fourier transform infrared spectroscopy, thermogravimetric/derivative thermogravimetric investigations and X-ray powder diffraction patterns. The Tb2 O2 SO4 compound was obtained at 1300 K and was used to compare thermal stability and photoluminescence behaviour with that of Gd2 O2 SO4 :Tb3+ (0.1, 1.0, and 10.0 mol%). Magnetic susceptibility measurements indicated the presence of 15% Tb4+ phases within Tb2 O2 SO4 . The materials were excited at 377 nm and displayed green narrow lines with the strongest emission peak at 545.5 nm due to the 5 D4 →7 F5 transition of Tb3+ ions. Brightness of terbium-activated gadolinium oxysulfate phosphors was enhanced with increase in the concentration of Tb3+ . Detailed analysis of spectroscopic properties of materials under investigations revealed efficient Gd2 O2 SO4 to Tb3+ and Tb3+ to Tb3+ energy transfers. Increase in dopant concentration led to the enhancement of 5 D4 →7 FJ emission intensity and reduction of 5 D3 →7 FJ emission intensity via cross-relaxation mechanisms. Distribution of particle size was increased by controlling dopant concentration in the host lattice. Obtained results confirmed that these materials could be applied potentially in field emission display devices and light-emitting diodes.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Substâncias Luminescentes / Luminescência Idioma: En Revista: Luminescence Assunto da revista: BIOFISICA / BIOQUIMICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Substâncias Luminescentes / Luminescência Idioma: En Revista: Luminescence Assunto da revista: BIOFISICA / BIOQUIMICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido