Up-conversion luminescence of Er3+/Yb3+ co-doped LiYF4 nanocrystals in sol–gel derived oxyfluoride glass-ceramics

Secu, M.; Secu, C.E.

doi:10.1016/j.jnoncrysol.2015.07.010

Cited by 26 publications

(13 citation statements)

References 34 publications

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“…Secu et al [82,84] prepared (100 − x)SiO 2 -xLiYF 4 GC powders doped with Eu 3+ and Er 3+ -Yb 3+ and compared the results for LiYF 4 :Eu 3+ and LiYF 4 :Er 3+ -Yb 3+ crystal pellets. As compared to an untreated xerogel, Eu 3+ -doped GC samples showed 7–8-fold stronger emission, a much longer lifetime of the 5 D 0 - 7 F 2 red emission (613 nm), and better resolved bands due to the Stark splitting and reduced inhomogeneous broadening typical of amorphous environments.…”

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…So it is extremely important to search suitable MIR emission NCs for NGC preparation. As an ideal host, fluorides with low phonon frequency and intense crystalline field, have been widely studied141516. Among these RE fluorides, NaYF 4 with low vibration energy (<400 cm −1 )17, controllable morphology and particle size18 have attracted widespread attention to study the visible up-conversion and near-infrared emission of RE ions in NaYF 4 NCs1718192021.…”

mentioning

confidence: 99%

Controllable Phase Transformation and Mid-infrared Emission from Er3+-Doped Hexagonal-/Cubic-NaYF4 Nanocrystals

Yang

Chen

et al. 2016

Sci Rep

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The morphology of hexagonal phase NaYF4:Er3+ nanorods synthesized by hydrothermal method changed greatly after a continuing calcination, along with a phase transformation to cubic phase. Photoluminescence (PL) spectra indicated that mid-infrared (MIR) emission was obtained in both hexagonal and cubic phase NaYF4:Er3+ nanocrystals for the first time. And the MIR emission of NaYF4:Er3+ nanocrystals enhanced remarkably at higher calcination temperature. To prevent uncontrollable morphology from phase transformation, the cubic phase NaYF4:Er3+ nanospheres with an average size of ~100 nm were prepared via a co-precipitation method directly. In contrast, the results showed better morphology and size of cubic phase NaYF4:Er3+ nanocrystals have realized when calcined at different temperatures. And PL spectra demonstrated a more intense MIR emission in the cubic phase NaYF4:Er3+ nanocrystals with an increasing temperature. Besides, the MIR emission peak of Er3+ ions had an obvious splitting in cubic phase NaYF4. Therefore, cubic phase NaYF4:Er3+ nanospheres with more excellent MIR luminescent properties seems to provide a new material for nanocrystal-glass composites, which is expected to open a broad new field for the realization of MIR lasers gain medium.

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“…Additionally, white light was also observed in Eu 2+ -Eu 3+ codoped LaF 3 based nGCs under UV excitation by S.H. Lee et al [9], and in nGCs comprising Yb 3+ -Er 3+ co-doped LiYF 4 NCs and Yb 3+ -Ho 3+ -Tm 3+ -Ce 3+ co-doped YF 3 NCs, under IR excitation, by M. Secu et al [23] and D. Chen et al [24] respectively.…”

Section: Introductionmentioning

confidence: 93%

“…silica), which is very important for their practical applications. In this regard, RE doped-oxifluoride nGCs containing Y and La based (with similar ionic radii and valence) NCs have been widely investigated [2,9,[17][18][19][20][21][22][23][24] due to the easy and homogeneous incorporation of RE ions into the fluoride nanocrystalline phase, which enhances the photoluminescence efficiency. In particular, in nGCs containing Tm 3+ -Yb 3+ co-doped YF 3 NCs [2] and Er 3+ -Tb 3+ -Yb 3+ co-doped Ba 2 LaF 7 NCs [17], up-conversion emissions were studied by D. Chen et al and H. K. Dan et al, respectively.…”

Section: Introductionmentioning

confidence: 99%

Bright luminescence of Gd3+ sensitized RE3+-doped SiO2-BaGdF5 glass-ceramics for UV-LEDs colour conversion

Yanes

del-Castillo

2017

Journal of Alloys and Compounds

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RE-doped (Eu 3+ , Sm 3+ , Dy 3+ or Tb 3+) nano-glass-ceramics containing BaGdF 5 nanocrystals, have been successfully obtained under thermal treatment of precursor sol-gel glasses. X-ray diffraction, high-resolution transmission electron microscope images and energy dispersive X-ray spectroscopy measurements confirmed the precipitation and distribution of cubic BaGdF 5 nanocrystals (around 10 nm in size) in the glass matrix. The luminescent properties, via excitation and emission spectra along with decay curves, were studied. In order to complete the structural analysis, the luminescent features of Eu 3+ and Sm 3+ ions were also used as sensitive probes, confirming the distribution of a significant fraction of dopant ions into the fluoride nanocrystalline environment. Intense visible emissions were obtained through efficient energy transfer from Gd 3+ to RE ions, which leads to consider these materials as potential emitting phosphors for colour converted UV LEDs.

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Up-conversion luminescence of Er3+/Yb3+ co-doped LiYF4 nanocrystals in sol–gel derived oxyfluoride glass-ceramics

Cited by 26 publications

References 34 publications

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

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

Controllable Phase Transformation and Mid-infrared Emission from Er3+-Doped Hexagonal-/Cubic-NaYF4 Nanocrystals

Bright luminescence of Gd3+ sensitized RE3+-doped SiO2-BaGdF5 glass-ceramics for UV-LEDs colour conversion

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