Tungsten sodium phosphate glasses doped with trivalent rare earth ions (Eu3+, Tb3+, Nd3+ and Er3+) for visible and near-infrared applications

Autor(es)

Dousti, M. R. ^[1] ; Poirier, G. Y. ^[2] ; de Camargo, A. S. S. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Rural Pernambuco, Acad Unit Cabo de Santo Agostinho, BR-54518430 Cabo De Santo Agostinho, PE - Brazil

^[2] Univ Fed Alfenas, Inst Sci & Technol, BR-37715400 Pocos De Caldas, MG - Brazil

^[3] Univ Sao Paulo, Sao Carlos Phys Inst, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Non-Crystalline Solids; v. 530, FEB 15 2020.
• Citações Web of Science: 0

Resumo

Tungsten-phosphate glasses doped with different rare earth ions (Er3+, Eu3+, Nd3+ and Tb3+) were obtained by the conventional melt-quenching technique. At high amounts of tungsten oxide ( >50 mol%), the tungsten-phosphate glasses are only translucent due to reduced W5+ species. However, the transparency of the glasses is significantly increased by the addition of Sb2O3- as an oxidating agent which promotes the conversion of W5+ into W6+. FTIR spectra allowed identification of absorption bands corresponding to phosphate structural groups and tungsten units in the 500-1300 cm(-1) spectral region. The optical absorption, luminescence excitation and emission spectra were collected and Judd-Ofelt analysis was carried out for selected samples. It is observed that by increasing the amount of WO3, the lifetime of the Er3+ NIR emission increases as well as the branching ratio of Eu3+ emission band at 610 nm, respectively, due to lowering of the average phonon energy of the glassy system and increasing of the site asymmetry around the rare earth ions. Details on the photophysics of these glasses, including upconversion and the analysis of radiative properties via Judd-Ofelt calculations are given and discussed as a function of structural variations and dopant ion concentrations. (AU)

• Processo FAPESP: 13/24064-8 - Estudos estruturais e fotofísicos de vidros fosfato de tungstênio dopados com íons terras raras e nanopartículas metálicas
• Beneficiário: Mohammad Reza Dousti
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs