Influence of silicate sol–gel host matrices and catalyst agents on the luminescent properties of Eu<sup>3+</sup>/Gd<sup>3+</sup> under different excitation wavelengths

Szpikowska‐Sroka, Barbara; Pawlik, Natalia; Goryczka, Tomasz; Pisarski, Wojciech A.

doi:10.1039/c5ra15562b

Cited by 26 publications

(12 citation statements)

References 56 publications

(77 reference statements)

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“…The sol-gel (SG) route appears to be a promising alternative to prepare OxGC films and bulk materials for different applications, such as planar waveguides or integrated optics [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36]. Ballato et al [35] proposed to use LaF 3 into planar photonic devices, such as planar confined waveguide and Kumar et al [36] described Er 3+ doped LaF 3 transparent gels for its use in the infrared (IR) waveguide amplifiers at 1.5 μm.…”

Section: Introductionmentioning

confidence: 99%

Transparent Sol-Gel Oxyfluoride Glass-Ceramics with High Crystalline Fraction and Study of RE Incorporation

et al. 2019

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Transparent oxyfluoride glass-ceramic films and self-supported layers with composition 80SiO2-20LaF3 doped with Er3+ have been successfully synthesized by sol-gel process for the first time. Crack-free films and self-supported layer with a maximum thickness up to 1.4 µm were obtained after heat treatment at the low temperature of 550 °C for 1 min, resulting in a LaF3 crystal fraction of 18 wt%, as confirmed by quantitative Rietveld refinement. This is the highest value reported up to now for transparent oxyfluoride glass-ceramics prepared by sol-gel. This work provides a new synthesis strategy and opens the way to a wide range of potential applications of oxyfluoride glass-ceramics. The characterization by a wide range of techniques revealed the homogeneous precipitation of LaF3 nanocrystals into the glass matrix. X-ray absorption spectroscopy and electron paramagnetic resonance confirmed that the Er3+ ions are preferentially embedded in the low phonon-energy LaF3 nanocrystals. Moreover, photoluminescence (PL) measurements confirmed the incorporation of dopants in the LaF3 nanocrystals. The effective concentration of rare-earth ions in the LaF3 nanocrystals is also estimated by X-ray absorption spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Transparent Sol-Gel Oxyfluoride Glass-Ceramics with High Crystalline Fraction and Study of RE Incorporation

et al. 2019

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“…Results confirmed that GdF 3 NCs, 5 nm in size, precipitated during heat treatment at 300 and 400 °C, Figure 5, but GdOF NCs appeared when the temperature was increased to 500 °C. More recently, Szpikowska-Sroka et al studied the optical properties of Eu 3+ -doped SiO 2 -GdF 3 GCs, with a very low composition of active media, around 3–6 mol %, based on Fuhijara’s synthesis [65,66,67]. The PL associated with Eu 3+ ions in GdF 3 phase was more efficient due to the low phonon energy of the crystal phase.…”

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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“…In general, the numerous optical materials are utilizing the luminescence from trivalent rare‐earth elements (RE 3+ ) . Hence, much research attention has been paid to the synthesis of RE 3+ ‐doped AF 3 nanocrystalline fluoride systems: LaF 3 , GdF 3 , and YF 3 .…”

Section: Introductionmentioning

confidence: 99%

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals

et al. 2018

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In this work, silica powders and transparent glass‐ceramic materials containing LaF3:Eu3+ nanocrystals were synthesized using the low‐temperature sol‐gel technique. Prepared samples were characterized by TG/DSC analysis as well as X‐ray diffraction and IR spectroscopy. The transformation from liquid sols toward bulk powders and xerogels was also examined and analyzed. The optical behavior of prepared Eu3+‐doped sol‐gel samples were evaluated based on photoluminescence excitation (PLE: λem = 611 nm) and emission (PL: λexc = 393 nm, λexc = 397 nm) spectra as well as luminescence decay analysis. The series of luminescence lines located within reddish‐orange spectral scope were registered and identified as the intra‐configurational 4f6‐4f6 transitions originated from Eu3+ optically active ions (5D0 → 7FJ, J = 0‐4). Moreover, the R/O‐ratio was also calculated to estimate the symmetry in local framework around Eu3+ ions. The luminescence spectra and double‐exponential character of decay curves recorded for fabricated nanocrystalline sol‐gel samples (τ1(5D0) = 2.07 ms, τ2(5D0) = 8.07 ms and τ1(5D0) = 0.79 ms, τ2(5D0) = 9.76 ms for powders and glass‐ceramics, respectively) indicated the successful migration of optically active Eu3+ ions from amorphous silica framework to low phonon energy LaF3 nanocrystal phase.

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Influence of silicate sol–gel host matrices and catalyst agents on the luminescent properties of Eu³⁺/Gd³⁺ under different excitation wavelengths

Abstract: Sol–gel silicate glasses co-doped with Gd3+ and Eu3+ ions were successfully obtained and the pronounced effect of the matrix composition on the luminescent properties and energy transfer process from Gd3+ to Eu3+ was confirmed.

Cited by 26 publications

References 56 publications

Transparent Sol-Gel Oxyfluoride Glass-Ceramics with High Crystalline Fraction and Study of RE Incorporation

Transparent Sol-Gel Oxyfluoride Glass-Ceramics with High Crystalline Fraction and Study of RE Incorporation

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

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals

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Influence of silicate sol–gel host matrices and catalyst agents on the luminescent properties of Eu3+/Gd3+ under different excitation wavelengths

Abstract: Sol–gel silicate glasses co-doped with Gd3+ and Eu3+ ions were successfully obtained and the pronounced effect of the matrix composition on the luminescent properties and energy transfer process from Gd3+ to Eu3+ was confirmed.

Cited by 26 publications

References 56 publications

Transparent Sol-Gel Oxyfluoride Glass-Ceramics with High Crystalline Fraction and Study of RE Incorporation

Transparent Sol-Gel Oxyfluoride Glass-Ceramics with High Crystalline Fraction and Study of RE Incorporation

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

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF3:Eu3+ nanocrystals

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Influence of silicate sol–gel host matrices and catalyst agents on the luminescent properties of Eu³⁺/Gd³⁺ under different excitation wavelengths

Structural and luminescence properties of silica powders and transparent glass‐ceramics containing LaF₃:Eu³⁺ nanocrystals