Intense UV and visible up-conversion emissions from RE-doped SiO2–BaGdF5 nano-glass-ceramics

2018 ◽  
Vol 20 (32) ◽  
pp. 20910-20918 ◽  
Author(s):  
J. del-Castillo ◽  
A. C. Yanes
Keyword(s):  
Thermal Treatment ◽  
Sol Gel ◽  
Glass Ceramics ◽  
High Efficient ◽  
Gel Glasses

High-efficient UV and VIS up-conversion RE-doped nano-glass-ceramics comprising BaGdF5 nanocrystals, have been developed under thermal treatment of precursor sol–gel glasses.

Structural and Spectroscopic Assessment of Er3+-Activated SiO2-HfO2 Glass Ceramics Planar Waveguides

2008 ◽  
Vol 55 ◽  
pp. 56-61
Author(s):  
L. Minati ◽  
Giorgio Speranza ◽  
Yoann Jestin ◽  
Cristina Armellini ◽  
Andrea Chiappini ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Spinodal Decomposition ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Emission Spectra ◽  
Planar Waveguides ◽  
Material Structure ◽  
Crystalline Environment ◽  
Concentration Threshold

Two series of xHfO2 - (100-x) SiO2 (x=10, 20, 30 mol%) glass-ceramics planar waveguides doped with 0.3 mol% Er3+ ions were prepared by the sol-gel route. A thermal treatment at 1000°C was applied to the second series of samples to nucleate HfO2 crystals. The waveguides were analyzed by X-ray photoelectron spectroscopy to study the effect of the Hf concentration and of the annealing on the material structure. XPS shows that in the first series of samples a Hf concentration threshold exists. Above this threshold the material undergoes a spinodal decomposition with formation of HfO2 rich domains. In the second series of samples the presence of thermal treatment lowers the concentration threshold so that the phase separation occurs also at a Hf concentration of 10%mol. In the waveguides where spinodal decomposition in present, the emission spectra from the Er3+ ions reveal a sensible narrowing of the 4I13/2 → 4I15/2 line. This demonstrates the presence of a crystalline environment for the Er3+ ions since the inhomogeneous broadening due to the disordered glassy network is suppressed. These results may have important implications for the fabrication of photonic devices with increased efficiency.

FTIR and optical assessment of zinc doped calcium phospho-borosilicate sol-gel glasses/glass-ceramics

2015 ◽  
Author(s):  
V. Kumar ◽  
N. Arora ◽  
O. P. Pandey ◽  
G. Kaur
Keyword(s):  
Sol Gel ◽  
Glass Ceramics ◽  
Gel Glasses

scholarly journals Fe-Doped Sol-Gel Glasses and Glass-Ceramics for Magnetic Hyperthermia

Materials ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 173 ◽  
Author(s):  
◽  
◽  
◽  
◽  
◽  
...  
Keyword(s):  
Sol Gel ◽  
Glass Ceramics ◽  
Magnetic Hyperthermia ◽  
Gel Glasses

Red luminescence in MgO-GeO2 gel glasses and glass ceramics doped with Mn ions prepared by sol-gel method

2007 ◽  
Vol 41 (3) ◽  
pp. 237-243 ◽  
Author(s):  
Tomoe Sanada ◽  
Kazuhiro Yamamoto ◽  
Kazuo Kojima ◽  
Noriyuki Wada
Keyword(s):  
Sol Gel ◽  
Glass Ceramics ◽  
Gel Method ◽  
Sol Gel Method ◽  
Red Luminescence ◽  
Gel Glasses

Natural rubber composites containing fillers of sol–gel glasses and glass–ceramics in the CaO–SiO2–P2O5 system

2020 ◽  
Vol 29 (9) ◽  
pp. 799-810
Author(s):  
Abdullah G. Al-Sehemi ◽  
Ahmed A. Al-Ghamdi ◽  
Nikolay T. Dishovsky ◽  
Lachezar Radev ◽  
Irena Mihailova ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Rubber Composites ◽  
Natural Rubber Composites ◽  
Gel Glasses ◽  
P2o5 System

Novel Sol-Gel Nano-Glass-Ceramics Comprising Ln3+-Doped YF3 Nanocrystals: Structure and High Efficient UV Up-Conversion

2011 ◽  
Vol 21 (16) ◽  
pp. 3136-3142 ◽  
Author(s):  
A. Carlos Yanes ◽  
Alejandro Santana-Alonso ◽  
Jorge Méndez-Ramos ◽  
Javier del-Castillo ◽  
Vicente D. Rodríguez
Keyword(s):  
Sol Gel ◽  
Glass Ceramics ◽  
High Efficient

Luminescence of Nanostructured SnO2-SiO2 Glass-Ceramics Prepared Sol–Gel Method

2008 ◽  
Vol 8 (4) ◽  
pp. 2143-2146 ◽  
Author(s):  
J. del-Castillo ◽  
A. C. Yanes ◽  
J. Méndez-Ramos ◽  
V. D. Rodríguez
Keyword(s):  
Band Gap ◽  
Quantum Confinement Effect ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Wide Band ◽  
Mass Model ◽  
Conduction Band Electron ◽  
Gel Glasses ◽  
Average Size ◽  
Nanostructured Silica

Nanostructured silica based glass-ceramics samples of composition (100 – x)SiO2-xSnO2, with x from 1 to 10, have been synthesized by thermal treatment of precursor sol–gel glasses. The average size of the obtained SnO2 nanocrystals, calculated by using the X-ray diffraction, can be predetermined by using well-controlled concentration of tin precursor. The mean radius ranging from 1.6 to 5.5 nm, is comparable to the exciton Bohr radius, corresponding to wide band-gap semiconductor quantum-dots in an insulator SiO2 glass. A spectroscopy study in terms of optical absorption and photoluminescence spectra has been carried out as a function of SnO2 concentration. Size-dependent red-shifts of excitation and emission bands, with increasing of tin precursor concentration, point to the quantum confinement effect. The nanocrystal sizes have been obtained and compared by using the Brus and Scherrer equations. The band gap increase is in agreement with results, based on the effective mass model. The recombination of conduction band electron with oxygen vacancies is proposed to explain the luminescence red-shift.

Sol−Gel Glasses as Precursors of Bioactive Glass Ceramics

2003 ◽  
Vol 15 (3) ◽  
pp. 798-806 ◽  
Author(s):  
J. Román ◽  
S. Padilla ◽  
M. Vallet-Regí
Keyword(s):  
Bioactive Glass ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Gel Glasses
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