Long-wave IR spectra of rare-earth metal oxysulfides

Golovin, Yu. M.; Petrov, K. I.; Grizik, A.A.

doi:10.1007/bf00939108

Cited by 6 publications

(3 citation statements)

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“…[9] In the phonon calculations of R 2 O 2 S/R 2 O 3 , Raman-active modes are well reproduced, while IR-active modes are not, at the first glance. Unfortunately, only a few IR experimental works performed in 1970s are available [26,27]. We suspect the accuracy of the experimental data, as discussed in Ref.…”

Section: Resultsmentioning

confidence: 96%

Electronic structure of rare-earth sesquioxides and oxysulfides

Mikami

Nakamura

2006

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 96%

Electronic structure of rare-earth sesquioxides and oxysulfides

Mikami

Nakamura

2006

Journal of Alloys and Compounds

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“…It indicates that the amorphous phase of the precursor is converted to hexagonal Gd 2 O 2 S.The IR spectrum of the sulfurized sample (Fig.12a) displays essentially a peak at 447 cm À1 . The wavelength IR spectra of several rare earth oxysulfides have been investigated by Golovin et al,14 all the vibrational modes are below 500 cm À1 . The only band observed within the range of our apparatus is assigned to the Gd-O vibrations (E u type) and is actually composed of a main peak at 430 cm À1 and a shoulder at 475 cm À1 .…”

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confidence: 99%

New nanoplatform based on Gd2O2S:Eu3+ core: synthesis, characterization and use for in vitro bio-labelling

et al. 2011

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The synthesis of Gd 2 O 2 S:Eu 3+ nanoparticles (NPs), from hydroxycarbonate precursor precipitation followed by sulfuration in a H 2 S/Ar atmosphere at 750 C; is reported. It is the first time that the size of Gd 2 O 2 S:Eu 3+ NPs can be finely tuned from 60 nm to more than 200 nm by controlling the precipitation medium, the maturation time and the sulfuration route. The oxysulfide Gd 2 O 2 S:Eu 3+ NPs emit strong red luminescence at 624 nm when excited by near UV (363 nm) or by X-rays. They may thus be considered as nano-phosphors and nano-scintillators. Then, the surface of oxysulfide NPs has been modified by an amino-silica or by a mesoporous silica shell (thickness 10-15 nm). The luminescence intensity of europium in gadolinium oxysulfide NPs has been maintained in the amino-silica coated particles Gd 2 O 2 S:Eu 3+ @SiO 2 -APTMS, whereas it has been significantly enhanced in the mesoporous silica coated Gd 2 O 2 S:Eu 3+ @mSiO 2 . This versatile new nanoplatform can be easily internalized in living NIH3T3 mouse cells. It is not cytotoxic up to 1 mg mL À1 and can be easily imaged by epifluorescence microscopy with excitation in the NUV. Consequently this spherical monodispersed Gd 2 O 2 S:Eu 3+ nanophosphor could be considered as a very promising new fluorescent probe for bio-labelling, better than the corresponding oxide or fluoride nanoparticles.

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“…These emissions are known to occur via classical energy transfer from Yb 3+ ions (sensitizers) to Tm 3+ ions (activators) and are quite specific of 3 H 4 → 3 H 6 , 3 F 3 → 3 H 6 , 1 G 4 → 3 F 4 and 1 G 4 → 3 H 6 transitions respectively. [16,25,26] The emission intensities are quite dependent on the proportion of doping elements. Consequently, we evaluated the impact of different proportions of Yb 3+ /Tm 3+ on the main emission peaks to primarily boost the NIR emission (802 nm) which is the most interesting for tissue penetration and bioimaging.…”

Section: Nps Characterizationmentioning

confidence: 99%

Custom NIR Imaging of New Up‐Conversion Multimodal Gadolinium Oxysulfide Nanoparticles

Santelli

Lepoix

Lechevallier³

et al. 2021

Part & Part Syst Charact

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Up‐conversion (UC) nanoparticles (NPs) appear as promising probes for easy, cost‐effective, and efficient in vivo imaging. In this paper, a new kind of UCNPs is proposed: Gd2O2S:Yb3+/Tm3+ for multimodal bioimaging, exhibiting a strong fluorescent emission in the near‐infrared range (802 nm) when excited at 980 nm. The in vivo fluorescence detection of such NPs is made possible by the development of a dedicated custom‐made imaging system. However, the high sensitivity of the techniques is counterbalanced with a limited resolution which highlights the necessity of combining different approaches to gather as much vital information as possible. The presence of a large amount of gadolinium also confers interesting contrasting properties both in magnetic resonance imaging (MRI) and computed tomography (CT) that could be advantageously exploited in the context of multimodal in vivo imaging. In this study, the UC emission properties and energy transfer processes of this new nanoprobe are reported. The detectability of the UCNPs is exhibited using the custom‐made imaging system in different tissues (skin, muscle, kidney, liver, brain), depths (different anatomical localization), and species (rat and mouse), punctually and chronically. Last, promising multimodal bioimaging results are presented in UC, MRI, and CT, showing a relatively low detection threshold.

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Long-wave IR spectra of rare-earth metal oxysulfides

Cited by 6 publications

References 1 publication

Electronic structure of rare-earth sesquioxides and oxysulfides

Electronic structure of rare-earth sesquioxides and oxysulfides

New nanoplatform based on Gd2O2S:Eu3+ core: synthesis, characterization and use for in vitro bio-labelling

Custom NIR Imaging of New Up‐Conversion Multimodal Gadolinium Oxysulfide Nanoparticles

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