The influence of the nanocrystals size and surface on the Yb/Er doped LaF3 luminescence properties

Secu, C.E.; Matei, Elena; Negrilǎ, C.; Secu, M.

doi:10.1016/j.jallcom.2019.03.267

Cited by 36 publications

(21 citation statements)

References 45 publications

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“…The NCs described in the present work are bigger than 20 nm, and the Pr 3+ concentration is low (0.1%). These features can minimize the surface effects mainly due to the small number of Pr 3+ ions located at the surface and the adsorption of molecules from the environment [ 50 , 51 ]. In this line, we have additionally studied the dependence of the emission lifetime on Pr 3+ concentration for NCs obtained through solvothermal, precipitation, and sol–gel Pechini methods ( Figure 13 ).…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study on Luminescence Properties of Y2O3: Pr3+ Nanocrystals Prepared by Different Synthesis Methods

et al. 2020

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Pr3+-doped Y2O3 nanocrystals (NCs) have been obtained via five wet-chemistry synthesis methods which were optimized in order to achieve superior optical properties. To this end, a systematic study on the influence of different reaction parameters was performed for each procedure. Specifically, precursor concentration, reaction temperature, calcination temperature, and time, among others, were analyzed. The synthesized Y2O3: Pr3+ NCs were characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), and reflectance and Raman spectroscopy. In addition, the optical properties of such NCs were investigated by excitation, emission, and luminescence decay measurements. Concretely, emission from the 1D2 level was detected in all samples, while emission from 3PJ was absent. Finally, the effect of the synthesis methods and the reaction conditions on the luminescence decay has been discussed, and a comparative study of the different methods using the fluorescence lifetime of so-obtained Y2O3: Pr3+ NCs as a figure of merit has been carried out.

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Section: Resultsmentioning

confidence: 99%

A Comparative Study on Luminescence Properties of Y2O3: Pr3+ Nanocrystals Prepared by Different Synthesis Methods

et al. 2020

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“…The glass-ceramic with LaF 3 nanocrystals was reported for the first time by Dejneka as non-toxic glass-ceramic [114]. Next, researchers studied systemically the preparation of the rare-earth-doped glass-ceramic containing lanthanide trifluoride nanocrystals [115,116,117,118,119,120,121,122,123,124].…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic Properties of Erbium-Doped Oxyfluoride Phospho-Tellurite Glass and Transparent Glass-Ceramic Containing BaF2 Nanocrystals

et al. 2019

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The ErF3-doped oxyfluoride phospho-tellurite glasses in the (40-x) TeO2-10P2O5-45 (BaF2-ZnF2) -5Na2O-xErF3 system (where x = 0.25, 0.50, 0.75, 1.00, and 1.25 mol%) have been prepared by the conventional melt-quenching method. The effect of erbium trifluoride addition on thermal, structure, and spectroscopic properties of oxyfluoride phospho-tellurite precursor glass was studied by differential scanning calorimetry (DSC), Fourier-transform infrared (FTIR), and Raman spectroscopy as well as emission measurements, respectively. The DSC curves were used to investigate characteristic temperatures and thermal stability of the precursor glass doped with varying content of ErF3. FTIR and Raman spectra were introduced to characterize the evolution of structure and phonon energy of the glasses. It was found that the addition of ErF3 up to 1.25 mol% into the chemical composition of phospho-tellurite precursor glass enhanced 2.7 µm emission and upconversion. By controlled heat-treatment process of the host glass doped with the highest content of erbium trifluoride (1.25 mol%), transparent erbium-doped phospho-tellurite glass-ceramic (GC) was obtained. X-ray diffraction analysis confirmed the presence of BaF2 nanocrystals with the average 16 nm diameter in a glass matrix. Moreover, MIR, NIR, and UC emissions of the glass-ceramic were discussed in detail and compared to the spectroscopic properties of the glass doped with 1.25 mol% of ErF3 (the base glass).

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“…The 529.07 eV peak was assigned to the oxidized metal, whereas the 531.99 eV peak was assigned to the adsorbed species and carbon bonds; low signal of the oxygen indicates low oxygen concentration. The oxidized metal species were observed in LaF 3 nanoparticles within a nanometric layer at their surfaces [ 18 ] and are related to the calcination process. Regarding the Tb 3+ -ion dopant, its characteristic spectrum in the 4d region between 140 and 160 eV showed a complex multiplet splitting (not presented), which is difficult to analyze.…”

Section: Resultsmentioning

confidence: 99%

“…For the preparation of Tb (8 mol%)-doped CeF 3 nanocrystalline powders, we used the chemical precipitation technique at room temperature mediated by the ethylene glycol solvent, similar to [ 18 ]. The raw materials Ce(NO 3 ) 3 · 6H 2 O (99.5%), Tb(NO 3 ) 3 · xH 2 O (99.9%), NH 4 F (99.99%), and anhydrous ethylene glycol (99.8%) were used for the synthesis.…”

Section: Methodsmentioning

confidence: 99%

Towards a Correlation between Structural, Magnetic, and Luminescence Properties of CeF3:Tb3+ Nanocrystals

et al. 2020

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In this study, we report on the structural, magnetic, and optical properties of Tb3+-doped CeF3 nanocrystals prepared via a polyol-assisted route, followed by calcination. X-ray diffraction analysis and electron microscopy investigations have shown the formation of a dominant Ce0.75F3 nanocrystalline phase (of about 99%), with a relatively uniform distribution of nanocrystals about 15 nm in size. Magnetization curves showed typical paramagnetic properties related to the presence of Ce3+ and Tb3+ ions. The magnetic susceptibility showed a weak inflexion at about 150 K, assigned to the cerium ions’ crystal field splitting. Under UV light excitation of the Ce3+ ions, we observed Tb3+ green luminescence with a quantum yield of about 20%.

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The influence of the nanocrystals size and surface on the Yb/Er doped LaF3 luminescence properties

Cited by 36 publications

References 45 publications

A Comparative Study on Luminescence Properties of Y2O3: Pr3+ Nanocrystals Prepared by Different Synthesis Methods

A Comparative Study on Luminescence Properties of Y2O3: Pr3+ Nanocrystals Prepared by Different Synthesis Methods

Spectroscopic Properties of Erbium-Doped Oxyfluoride Phospho-Tellurite Glass and Transparent Glass-Ceramic Containing BaF2 Nanocrystals

Towards a Correlation between Structural, Magnetic, and Luminescence Properties of CeF3:Tb3+ Nanocrystals

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