Thermally activated conversion of a silicate gel to an oxyfluoride glass ceramic: Optical study using Eu3+ probe ion

Secu, C.E.; Bartha, Cristina; Poloşan, Silviu; Secu, M.

doi:10.1016/j.jlumin.2013.10.013

Cited by 21 publications

(33 citation statements)

References 34 publications

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“…Site-selective spectroscopy can excite single sites, but it is difficult to get an overall picture of the glass structure. Eu 3+ can be used to monitor the partial crystallization of glasses and the formation of glass ceramics [639][640][641][642][643][644][645]. [646].…”

Section: Magnetic Circular Dichroism (Mcd)mentioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,364

108

1,912

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Section: Magnetic Circular Dichroism (Mcd)mentioning

confidence: 99%

Interpretation of europium(III) spectra

Binnemans

2015

Coordination Chemistry Reviews

2,364

108

1,912

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“…Photoluminescence (PL) emission was detected only for samples treated at 800 °C and green and red UC emissions were observed upon 980 nm excitation. The same composition and synthesis were used by Secu et al when doping materials with Pr 3+ , Sm 3+ , Eu 3+ , Dy 3+ , and Ho 3+ [35,36]. Small BaF 2 crystals (∼7 nm) were precipitated upon heat treatment at 800 °C for 1 h. No Ln 3+ emission was observed for xerogels except for Eu 3+ , while for all the GCs typical 4f-4f transitions were observed showing the Stark splitting of the bands (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Transparent Glass-Ceramics Produced by Sol-Gel: A Suitable Alternative for Photonic Materials

et al. 2018

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Transparent glass-ceramics have shown interesting optical properties for several photonic applications. In particular, compositions based on oxide glass matrices with fluoride crystals embedded inside, known as oxyfluoride glass-ceramics, have gained increasing interest in the last few decades. Melt-quenching is still the most used method to prepare these materials but sol-gel has been indicated as a suitable alternative. Many papers have been published since the end of the 1990s, when these materials were prepared by sol-gel for the first time, thus a review of the achievements obtained so far is necessary. In the first part of this paper, a review of transparent sol-gel glass-ceramics is made focusing mainly on oxyfluoride compositions. Many interesting optical results have been obtained but very little innovation of synthesis and processing is found with respect to pioneering papers published 20 years ago. In the second part we describe the improvements in synthesis and processing obtained by the authors during the last five years. The main achievements are the preparation of oxyfluoride glass-ceramics with a much higher fluoride crystal fraction, at least double that reported up to now, and the first synthesis of NaGdF4 glass-ceramics. Moreover, a new SiO2 precursor was introduced in the synthesis, allowing for a reduction in the treatment temperature and favoring hydroxyl group removal. Interesting optical properties demonstrated the incorporation of dopant ions in the fluoride crystals, thus obtaining crystal-like spectra along with higher efficiencies with respect to xerogels, and hence demonstrating that these materials are a suitable alternative for photonic applications.

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“…Wei 6 and Wu 12 have successfully observed efficient 2.7 μm emissions in Er 3+ -doped NaYF 4 and CaF 2 nanocrystals embedded oxyfluoride GCs prepared by melt-quenching method, respectively. As is well known, some disadvantages of melt-quenching method, such as high preparation temperature and energy consumption, uncontrollable crystal formation, and long and complex heat treatment, severely hinder the GCs-based applications 14 15 16 . On the other hand, the optical properties in these GCs are achieved only through a careful partial crystallization of the nanometer scale grains.…”

mentioning

confidence: 99%

Er3+-doped transparent glass ceramics containing micron-sized SrF2 crystals for 2.7 μm emissions

Jiang

Fan

Jiang

et al. 2016

Sci Rep

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Er3+-doped transparent glass ceramics containing micron-sized SrF2 crystals were obtained by direct liquid-phase sintering of a mixture of SrF2 powders and precursor glass powders at 820 °C for 15 min. The appearance and microstructural evolution of the SrF2 crystals in the resulting glass ceramics were investigated using X-ray diffraction, field-emission scanning electron microscopy and transmission microscopy. The SrF2 crystals are ~15 μm in size and are uniformly distributed throughout the fluorophosphate glass matrix. The glass ceramics achieve an average transmittance of 75% in the visible region and more than 85% in the near-IR region. The high transmittance of the glass ceramics results from matching the refractive index of the SrF2 with that of the precursor glass. Energy dispersive spectroscopy, photoluminescence spectra, and photoluminescence lifetimes verified the incorporation of Er3+ into the micron-sized SrF2 crystals. Intense 2.7 μm emissions due to the 4I11/2 → 4I13/2 transition were observed upon excitation at 980 nm using a laser diode. The maximum value of the emission cross section of Er3+ around 2.7 μm is more than 1.2 × 10−20 cm2, which indicates the potential of using transparent glass ceramics containing micron-sized SrF2 crystals for efficient 2.7 μm lasers and amplifiers.

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Thermally activated conversion of a silicate gel to an oxyfluoride glass ceramic: Optical study using Eu3+ probe ion

Cited by 21 publications

References 34 publications

Interpretation of europium(III) spectra

Interpretation of europium(III) spectra

Transparent Glass-Ceramics Produced by Sol-Gel: A Suitable Alternative for Photonic Materials

Er3+-doped transparent glass ceramics containing micron-sized SrF2 crystals for 2.7 μm emissions

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