Effects of Ho3+ and Yb3+ doping concentrations and Li+ co-doping on the luminescence of GdVO4 powders

Gavrilović, Tamara V.; Jovanović, Dragana J.; Trandafilović, Lidija V.; Dramićanin, Miroslav D.

doi:10.1016/j.optmat.2015.03.013

Cited by 39 publications

(21 citation statements)

References 20 publications

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“…Herein, the goal was to thoroughly investigate the size effect on the structure and luminescence of LaPO 4 :Eu 3+ nanophosphors. Materials were prepared by four different methods of synthesis: solid-state, coprecipitation, reverse micelle and colloidal in accordance to the methods used for syntheses of the lanthanide-doped GdVO 4 [30][31][32][33]. The size effect on luminescent emission intensities and decays, structure, and morphology were analyzed by steady-state and time-resolved photoluminescence spectroscopy, X-ray diffraction, scanning and transmission electron spectroscopy, and diffuse reflection spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Particle size effects on the structure and emission of Eu3+:LaPO4 and EuPO4 phosphors

Gavrilović

Periša

Papan

et al. 2018

Journal of Luminescence

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This paper provides the detailed study of (nano)particle's size effect on structural and luminescent properties of LaPO 4 :Eu 3+ synthesized by four different methods: high temperature solid-state, co-precipitation, reverse micelle and colloidal. These methods delivered monoclinic monazite-phase submicron particles (> 100 nm), 4 × 20 nm nanorods and 5 nm spheres (depending on the annealing temperature), 2 × 15 nm nanorods, and ultrasmall spheres (2 nm), respectively. The analysis of emission intensity dependence on Eu 3+ concentration showed that quenching concentration increases with a decrease of the particle size. The critical distance for energy transfer between Eu 3+ ions is found to be 18.2 Å, and the dipole-dipole interaction is the dominant mechanism responsible for the concentration quenching of emission. With the increase in Eu 3+ concentration, the unit-cell parameter slightly increases to accommodate larger Eu 3+ ions at sites of smaller La 3+ ions. Photoluminescent emission spectra presented four characteristic bands in the red spectral region: at 592 nm (5 D 0 → 7 F 1), at 612 nm (5 D 0 → 7 F 2), at 652 nm (5 D 0 → 7 F 3) and at 684 nm (5 D 0 → 7 F 4), while in small colloidal nanoparticles additional emission bands from host defects appear at shorter wavelengths. Intensities of f-f electronic transitions change with particles size due to small changes in symmetry around europium sites, while emission bandwidths increase with the reduction of particle size due to increased structural disorder. Judd-Ofelt analysis showed that internal quantum yield of Eu 3+ emission is strongly influenced by particle's morphology.

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Section: Introductionmentioning

confidence: 99%

Particle size effects on the structure and emission of Eu3+:LaPO4 and EuPO4 phosphors

Gavrilović

Periša

Papan

et al. 2018

Journal of Luminescence

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“…Gaft et al (2005) report Yb 3+ excitation to be strongly dependent on Nd, but NAA results from Donovan et al (2002) do not indicate any Nd contamination. Other potential candidates for energy transfer processes to Yb 3+ are Ho (e.g., Wei et al, 2011;Gavrilović et al, 2015;Kang et al, 2019) (NAA mass fraction: 0.2 ± 0.4 × 10 −3 ), Er (e.g., He et al, 2017;Wang et al, 2018;Kang https://doi.org/10.5194/essd-2020-296 Open Access…”

Section: Ree Reference Spectra At 532 Nm Laser Excitationmentioning

confidence: 99%

A spectral library for laser-induced fluorescence analysis as a tool for rare earth element identification

Fuchs¹,

Beyer²,

Lorenz³

et al. 2020

Preprint

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Abstract. With the recurring interest on rare-earth elements (REE), laser-induced fluorescence (LiF) may provide a powerful tool for their rapid and accurate identification at different stages along their value chain. Applications to natural materials such as rocks could complement the spectroscopy-based toolkit for innovative, non-invasive exploration technologies. However, the diagnostic assignment of detected emission lines to individual REE remains challenging, because of the complex composition of natural rocks in which they can be found. The resulting mixed spectra and the large amount of data generated demand for automated approaches of data evaluation, especially in mapping applications such as drill core scanning. LiF reference data provide the solution for robust REE identification, yet they usually remain in the form of tables of published emission lines. We show that a complete reference spectra library could open manifold options for innovative automated analysis. We present a library of high-resolution LiF reference spectra using the Smithsonian rare-earth phosphate standards for electron microprobe analysis.We employ three standard laser wavelengths (325 nm, 442 nm, 532 nm) to record representative spectra in the UV-visible to near-infrared spectral range (340–1080 nm). Excitation at all three laser wavelengths yielded characteristic spectra with distinct REE-related emission lines for EuPO4, TbPO4, DyPO4 and YbPO4. In the other samples, the high-energy excitation at 325 nm caused unspecific, broadband defect emissions. Here, lower energy laser excitation showed successful for suppressing non-REE-related emission. At 442 nm excitation, REE-reference spectra depict the diagnostic emission lines of PrPO4, SmPO4 and ErPO4. For NdPO4 and HoPO4 most efficient excitation was achieved with 532 nm. Our results emphasise on the possibility of selective REE excitation by changing the excitation wavelength according to the suitable conditions for individual REEs. Our reference spectra provide a database for transparent and reproducible evaluation of REE-bearing rocks. The LiF spectral library is available at https://zenodo.org/ and the registered DOI: http://doi.org/10.5281/zenodo.4054606 (Fuchs et al., 2020). It gives access to traceable data for manifold further studies on comparison of emission line positions, emission line intensity ratios and splitting into emission line sub-levels or can be used as reference or training data for automated approaches of component assignment.

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“…In molten salt synthesis, salts are used in extent to the nal product to facilitate an increase in the reaction rate and a lowering of the reaction temperature. [19][20][21] The combination of these two synthetic routes presented here allows to obtain homogenous uniform nanosized MgTiO 3 :Mn 4+ nanoparticles. [22][23][24][25][26] In this work we propose a multimodal optical approach for temperature determination and we compare the thermometry results.…”

Section: Introductionmentioning

confidence: 99%

MgTiO₃:Mn⁴⁺ a multi-reading temperature nanoprobe

et al. 2018

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Effects of Ho3+ and Yb3+ doping concentrations and Li+ co-doping on the luminescence of GdVO4 powders

Cited by 39 publications

References 20 publications

Particle size effects on the structure and emission of Eu3+:LaPO4 and EuPO4 phosphors

Particle size effects on the structure and emission of Eu3+:LaPO4 and EuPO4 phosphors

A spectral library for laser-induced fluorescence analysis as a tool for rare earth element identification

MgTiO₃:Mn⁴⁺ a multi-reading temperature nanoprobe

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Effects of Ho3+ and Yb3+ doping concentrations and Li+ co-doping on the luminescence of GdVO4 powders

Cited by 39 publications

References 20 publications

Particle size effects on the structure and emission of Eu3+:LaPO4 and EuPO4 phosphors

Particle size effects on the structure and emission of Eu3+:LaPO4 and EuPO4 phosphors

A spectral library for laser-induced fluorescence analysis as a tool for rare earth element identification

MgTiO3:Mn4+ a multi-reading temperature nanoprobe

Contact Info

Product

Resources

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MgTiO₃:Mn⁴⁺ a multi-reading temperature nanoprobe