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Qi J.,Ningbo University | Xu T.,Ningbo University | Wu Y.,92724 Troops of Peoples Liberation Army | Shen X.,Ningbo University | And 2 more authors.
Optical Materials | Year: 2013

Vitreous materials containing rare-earth (RE) ions and metallic nanoparticles (NPs) attract considerable interest because the presence of the NPs may lead to an intensification of luminescence. In this work, the characteristics of 1.54 μm luminescence for the Er3+ ions doped bismuthate glasses containing Ag NPs were studied under 980 nm excitation. The surface plasmon resonance (SPR) band of Ag NPs appears from 500 to 1500 nm. Transmission electron microscopic (TEM) image reveals that the Ag NPs are dispersed homogeneously with the size from 2 to 7 nm. The strength parameters Ωt(t = 2, 4, 6), spontaneous emission probability (A), radiative lifetime (τ) and stimulated emission section (σ em) of Er3+ ions were calculated by the Judd-Ofelt theory. When the glass contains 0.2 wt% AgCl, the 1.54 μm fluorescence intensity of Er3+ reaches a maximum value, which is 7.2 times higher than that of glass without Ag NPs. The Ag NPs embedded glasses show significantly fluorescence enhancement of Er3+ ions by local field enhancement from SPR. © 2013 Elsevier B.V. All rights reserved. Source


Zhang H.-F.,92724 Troops of Peoples Liberation Army | Wu Y.,92724 Troops of Peoples Liberation Army | Feng C.,92724 Troops of Peoples Liberation Army
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2013

Er3+-doped tellurite glasses with composition in mol percent of 75TeO2-10Nb2O5 -10ZnO-5Na2O-0.5Er2O3 -xCe2O3 (x=0.00, 0.25, 0.50, 0.75, 1.00) were prepared by conventional melt-quenching method. The absorption spectra, up-conversion luminescence spectra, Raman spectra and the fluorescence spectra of the glasses were measured. The intensity parameters Ωt (t=2, 4, 6), spontaneous radiative transition probability A, fluorescence branching ratio β and radiative lifetime τrad were calculated by Judd-Ofelt theory, and the Er3+ stimulated emission cross-section was calculated by McCumber theory. The bandwidth quality factor (σe peak × FWHM) and gain quality factor (σe peak × τm) of Er3+ ions were compared between the glasses, and the energy transfer (ET) mechanism between Er3+ /Ce3+ ions and the suppression effect of Ce3+ ions on up-conversion luminescence were also analyzed. The studies indicate that the addition of appropriate amount of Ce3+ ions can improve the spectral properties of Er3+-doped tellurium-niobium-zinc-sodium glasses. Source


Wu Y.,92724 Troops of Peoples Liberation Army | Zhang H.-F.,92724 Troops of Peoples Liberation Army | Feng J.-G.,92724 Troops of Peoples Liberation Army | Wang N.,92724 Troops of Peoples Liberation Army | And 4 more authors.
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2014

A series of Er3+/Tm3+/Yb3+: Ag-bismuth germanate glass nanocomposites were prepared by the conventional melting-quenching method. The absorption bands show that the surface plasmon resonance (SPR) peak of Ag nanoparticles (NPs) appears around 545 nm. Transmission electron microscopic image clearly reveals homogeneously dispersed Ag NPs with the size from 6 nm to 18 nm. The effect of nano-silver addition on the upconversion (UC) properties in Er3+/Tm3+/Yb3+ codoped bismuth germanate glasses is investigated. With the precipitation of the Ag NPs, more intense blue (472 nm), green (525 nm, 543 nm) and red (661 nm) UC emission bands are observed up to 3.2, 3.8, 5.4, 2.3 folds in the glass containing 1 wt% AgCl, respectively. Source

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