Sol–gel Eu3+/Tm3+ doped transparent glass–ceramic waveguides

Ribeiro, Sidney J. L.; Araújo, Carla C. de; Bueno, Luciano A.; Gonçalves, Rogéria Rocha; Messaddeq, Younès

doi:10.1016/j.jnoncrysol.2004.08.164

Cited by 21 publications

(14 citation statements)

References 9 publications

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“…In the last years, different authors have reported the development of SiO 2 ‐LaF 3 /LaOF oxyfluoride glass ceramics by sol‐gel, highlighting the works of Fujihara et al and Ribeiro et al Fujihara et al described the preparation of 90SiO 2 ‐10LaF 3 /LaOF thin films doped with Eu 3+ and reported that the luminescence associated to Eu 3+ ions increased when the RE ions are introduced in a oxyfluoride GCs matrix compared to silica glass matrix. Anyway, at high temperature (600‐900°C) LaOF crystals instead of LaF 3 are identified.…”

Section: Introductionmentioning

confidence: 97%

“…Moreover, phase separation is commonly produced during the quenching, thus limiting the possibility to obtain homogenous materials with high optical quality. Therefore, many efforts were concentrated to prepare oxyfluoride materials by sol‐gel method . This process allows obtaining purer materials, and compositions impossible or extremely difficult to obtain by MQ method using much lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

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80SiO₂‐20LaF₃ oxyfluoride glass ceramic coatings doped with Nd³⁺ for optical applications

Gorni

Balda

Fernández

et al. 2017

Int J of Appl Glass Sci

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Transparent glass ceramic (GC) films and self-supported layers of composition 80SiO 2 -20LaF 3 doped with Nd 3+ were prepared by sol-gel method for the first for up-conversion. 19,20 But MQ method presents some limitations such as the high temperature of processing that causes fluorine loss by evaporation. Moreover, phase separation is commonly produced during the quenching, thus limiting the possibility to obtain homogenous materials with high optical quality. Therefore, many efforts were concentrated to prepare oxyfluoride materials by sol-gel method. [21][22][23][24][25][26][27][28][29][30][31] This process allows obtaining purer materials, and compositions impossible or extremely difficult to --

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

80SiO₂‐20LaF₃ oxyfluoride glass ceramic coatings doped with Nd³⁺ for optical applications

Gorni

Balda

Fernández

et al. 2017

Int J of Appl Glass Sci

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“…Results showed important differences depending on the sintering temperature and, therefore, on the crystals phase. On the other hand, Ribeiro et al [48] prepared films with the same composition, finding that for heat treatment between 600 and 900 °C both LaF 3 and LaOF phases appeared. Eu 3+ ions emissions mainly from the 5 D 0 excited state reflected the change in the environment of these ions.…”

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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“…A large variety of silica based glass and glass ceramics has been obtained by sol-gel process from the hydrolysis of tetraethoxysilane (TEOS) [1,2]. The overall process involves hydrolysis and polycondensation reactions up to the formation of a gel.…”

Section: Introductionmentioning

confidence: 99%

“…For sake of clarity, the curves were shifted vertically by different factors. The small circles are plots of the fitting of the sum of Eqs (2). and(4)to the experimental data.…”

mentioning

confidence: 99%

Effects of poly(vinyl alcohol) additions on the structure of silica xerogels

Awano

Donatti

Ruiz

et al. 2009

Journal of Non-Crystalline Solids

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a b s t r a c tPoly(vinyl alcohol)/silica hybrid xerogels were prepared from sonohydrolysis of tetraethoxysilane (TEOS) and additions of water-solution of poly(vinyl alcohol) (PVA). The samples were studied by small-angle X-ray scattering (SAXS), nitrogen adsorption, and differential scanning calorimetry (DSC). On drying at room temperature the resulting xerogels exhibit a fairly bimodal porous structure composed by small mesopores and micropores. The pore size distribution of the mesopores was found to follow approximately a power-law with the pore size. The micropore structure was associated to an evolution at a high resolution level of the mass fractal structure of the original wet gels. The role of the PVA addition on the pore structure of the xerogels is to diminish the specific surface area and the pore volume without to change substantially the pore mean size.

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Sol–gel Eu3+/Tm3+ doped transparent glass–ceramic waveguides

Cited by 21 publications

References 9 publications

80SiO₂‐20LaF₃ oxyfluoride glass ceramic coatings doped with Nd³⁺ for optical applications

80SiO₂‐20LaF₃ oxyfluoride glass ceramic coatings doped with Nd³⁺ for optical applications

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

Effects of poly(vinyl alcohol) additions on the structure of silica xerogels

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Sol–gel Eu3+/Tm3+ doped transparent glass–ceramic waveguides

Cited by 21 publications

References 9 publications

80SiO2‐20LaF3 oxyfluoride glass ceramic coatings doped with Nd3+ for optical applications

80SiO2‐20LaF3 oxyfluoride glass ceramic coatings doped with Nd3+ for optical applications

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

Effects of poly(vinyl alcohol) additions on the structure of silica xerogels

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80SiO₂‐20LaF₃ oxyfluoride glass ceramic coatings doped with Nd³⁺ for optical applications

80SiO₂‐20LaF₃ oxyfluoride glass ceramic coatings doped with Nd³⁺ for optical applications