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Zhao Z.,Wuhan University of Technology | Liu C.,Wuhan University of Technology | Jiang Y.,China Building Material Institute of Solar Energy Application | Zhang J.,Wuhan University of Technology | And 5 more authors.
Journal of Non-Crystalline Solids | Year: 2014

Infrared emission properties of oxyfluoride glasses with nominal compositions of 55SiO2-10Al2O3-(35 - x - y)PbF2-xErF3-yYF3 (in mol%) with x = 0.1, 0.2, 0.3, or 0.5 and y = 0, or 1.0, were investigated. YF3 was doped into the glasses to overcome the concentration quenching and achieve efficient infrared emission from Er3 + doped oxyfluoride glass-ceramics. It was found that introduction of YF3 can efficiently promote the formation of Er3 +-doped fluoride nanocrystals even when the doping concentration of ErF3 was low. With the doping of YF3, infrared emission was significantly enhanced and strong infrared emissions at 980 nm and 2730 nm bands were observed. Prolongation of lifetimes of Er 3 +:4I13/2 and 4I11/2 energy levels showed that concentration quenching of the infrared emissions was greatly suppressed. These results indicate that oxyfluoride glass-ceramics co-doped with Y3 + have potentials for efficient infrared applications. © 2014 Elsevier B.V.


Han N.,Wuhan University of Technology | Liu C.,Wuhan University of Technology | Zhang J.,Wuhan University of Technology | Zhao X.,Wuhan University of Technology | And 3 more authors.
Journal of Non-Crystalline Solids | Year: 2014

Formation of PbS QDs in the glasses containing a small amount of lead oxide was examined. Oversaturation of sulfur only was sufficient to promote the formation of PbS QDs in the glasses. Upon thermal treatment, absorption of PbS QDs was tuned from 824 nm to 2213 nm. Infrared photoluminescence, especially, mid-infrared photoluminescence from PbS QDs was observed in the range of 1008 nm to 2182 nm. Ostwald ripening of PbS QDs occurred when the heat-treatment temperature was 530 °C or 540 °C, and led to the decrease in the absorption coefficients and splitting of the photoluminescence bands. © 2014 Elsevier B.V.


Zhang J.,Wuhan University of Technology | Zhang J.,Pohang University of Science and Technology | Zhao Z.,Wuhan University of Technology | Liu C.,Wuhan University of Technology | And 4 more authors.
Materials Characterization | Year: 2014

Nd3+ and Tm3+, doped oxy-fluoride glasses and glass ceramics were prepared by conventional melt-quenching and subsequent heat-treatment, respectively. β-PbF2 nanocrystals with diameter 50-100 nmformed in the glass matrix after heat treatment. The Stark splitting in absorption peaks, enhanced photoluminescence and prolonged lifetimes that β-PbF2 nanocrystal formation increased the luminescence of rare earth ions. Both Nd3+ and Tm3+ ions were incorporated into nanocrystals that were enriched in lead and fluorine, and deficient in oxygen. © 2014 Elsevier Inc. All rights reserved.


Zhao Z.,Wuhan University of Technology | Ai B.,Wuhan University of Technology | Liu C.,Wuhan University of Technology | Yin Q.,Wuhan University of Technology | And 3 more authors.
Journal of the American Ceramic Society | Year: 2015

Er3+ ions-doped germano-gallate oxyfluoride glass-ceramic containing BaF2 nanocrystals was prepared through conventional melt quenching and subsequent thermal treatment method. X-ray diffraction patterns and transmission electron microscope images confirmed the formation of BaF2 nanocrystals in glass-ceramics. Preferential incorporation of Er3+ ions into the BaF2 nanocrystals were confirmed by the absorption spectra and emission spectra, and enhanced upconversion emission and infrared emission were observed. Relatively high transmittance in the mid-infrared region indicated great potential of this germano-gallate oxyfluoride glass-ceramics as host materials for the efficient mid-infrared emission from rare-earth ions. © 2015 The American Ceramic Society.

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