Photoluminescence and Energy Transfer Between Sm &amp;lt;sup&amp;gt;3+&amp;lt;/sup&amp;gt; Ions in LaF&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; Nanocrystals Prepared by Hydrothermal Method

Ha, Hoang Manh

doi:10.11648/j.ijmsa.20160506.18

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…in line with observations fromGaft et al (2005), Friis et al (2010,Czaja et al (2012),Shalapska et al (2014), andGuan et al (2016). The pattern of four emission lines with the second line as most efficient emission resembles well observations by, for example,Ha et al (2016),Wantana et al (2017), and Yashodha et al (…”

supporting

confidence: 91%

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

Fuchs

Beyer

Lorenz

et al. 2021

Earth Syst. Sci. Data

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Abstract. With the recurring interest in rare earth elements (REEs), 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 minerals and rocks could complement the spectroscopy-based toolkit for innovative, non-invasive exploration technologies. However, the diagnostic assignment of detected emission lines to individual REEs 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 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, 442, 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, broad-band defect emissions. Here, lower-energy laser excitation is shown to be 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 the most efficient excitation was achieved with 532 nm. Our results emphasise 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 the transparent and reproducible evaluation of REE-bearing rocks. The LiF spectral library is available at zenodo.org and the registered DOI https://doi.org/10.5281/zenodo.4054606 (Fuchs et al., 2020). Primarily addressing the raw material exploration sector, it aids particularly the development of advanced data processing routines for LiF analysis but can also support further research on the REE luminescence in natural rocks or artificial compounds. It gives access to traceable data for the 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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supporting

confidence: 91%

“…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 et al, 2019) (NAA mass fraction: 0.2 ± 0.2 × 10 −3 ), Tb (e.g. Gandhi et al, 2014) (NAA mass fraction: 0.2 ± 0.3 × 10 −3 ) and Ce (e.g.…”

Section: Suitable Ree Excitation Wavelengthmentioning

confidence: 99%

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

Fuchs

Beyer

Lorenz

et al. 2021

Earth Syst. Sci. Data

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show abstract

“…3) in line with observations ofGaft et al (2005),Friis et al (2010),Czaja et al (2012),Shalapska et al (2014) andGuan et al (2016). The pattern of four emission lines with the second line as most efficient emission resembles well observations by (e.g Ha et al, 2016),Wantana et al (2017). orYashodha et al (2019), who…”

supporting

confidence: 88%

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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Synthesis and optical properties of efficient orange emitting GdB5O9:Sm3+ phosphors

Grigorjevaite

Janulevicius

Kruopyte

et al. 2019

J Sol-Gel Sci Technol

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Photoluminescence and Energy Transfer Between Sm <sup>3+</sup> Ions in LaF<sub>3</sub> Nanocrystals Prepared by Hydrothermal Method

Cited by 4 publications

References 18 publications

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

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

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

Synthesis and optical properties of efficient orange emitting GdB5O9:Sm3+ phosphors

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