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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.)

Spectroscopic investigation and Judd-Ofelt analysis of silver nanoparticles embedded Er3+-doped tellurite glass

Texto completo
Autor(es):
Amjad, Raja J. [1, 2] ; Dousti, M. R. [3, 4] ; Sahar, M. R. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Teknol Malaysia, Fac Sci, Adv Opt Mat Res Grp, Skudai 81310, Johor - Malaysia
[2] COMSATS Inst Informat Technol, Dept Phys, Lahore 54000 - Pakistan
[3] Univ Sao Paulo, Inst Fis Sao Carlos, Lab Espect Mat Funcionais LEMAF, Sao Carlos, SP - Brazil
[4] Islamic Azad Univ, Dept Phys, Tehran North Branch, Tehran - Iran
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: CURRENT APPLIED PHYSICS; v. 15, n. 1, p. 1-7, JAN 2015.
Citações Web of Science: 33
Resumo

A series of silver nanoparticles (NPs) embedded zinc-tellurite glass is prepared by melt-quenching technique. The transmission electron microscopic images reveal spherical as well as anisotropic silver NPs having average diameter in the range of 14-48 nm. The Er3+-free glass sample containing AgCl exhibits surface plasmon resonance (SPR) band of Ag NPs centered at similar to 501 nm. From Judd-Ofelt analysis, it is found that by increasing the concentration of NPs, the value of Q(2) is enhanced suggesting increased covalency and decreased symmetry around the Er3+ ions. Integrated emission cross-section (IEC) is enhanced as the concentration of silver NPs is increased up to 0.5 mol% AgCl. Fourier infrared spectra show that the intensity of the vibrational band of the water molecule and fundamental stretching band of OH group are suppressed. Furthermore, under an excitation wavelength of 786 nm, three prominent upconversion emissions are observed at 520 nm, 550 nm and 650 nm which are attributed to H-2(11/2) -> I-4(15/2), S-4(3/2) -> I-4(15/2), and F-4(9/2) -> I-4(15/2) transitions, respectively. The upconversion emissions are enhanced significantly by introduction of silver NPs. The enhancement is mainly attributed to the local field effect of silver NPs. Studied nanocomposites are potential candidates for the development of solid state lasers. (C) 2014 Elsevier B.V. All rights reserved. (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
Linha de fomento: Bolsas no Brasil - Pós-Doutorado