Upconversion Fluorescence in Naturally Occurring Calcium Fluoride

@article{Moffatt2020UpconversionFI,
  title={Upconversion Fluorescence in Naturally Occurring Calcium Fluoride},
  author={Jillian Elizabeth Moffatt and Thomas Bede Payten and Georgios Tsiminis and Thomas J. de Prinse and Lewis da Silva Teixeira and Elizaveta Klantsataya and David J. Ottaway and Barnaby W. Smith and Nigel A. Spooner},
  journal={Applied Spectroscopy},
  year={2020},
  volume={75},
  pages={674 - 689}
}
Fluorine can negatively interfere with leach and smelting processes during mineral processing. Real-time knowledge of the concentration and mineral hosts of fluorine in a mineral processing ore stream is important to protect process line equipment and product. Currently only offline methods of detection are available. Online sensors that determine specific fluorine-bearing mineral concentration in real-time would enable improved efficiency in processing decisions during mine production. Common… 

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References

SHOWING 1-10 OF 82 REFERENCES
Fast 2D Laser-Induced Fluorescence Spectroscopy Mapping of Rare Earth Elements in Rock Samples
TLDR
This study sets the basis for the development of a combined mapping sensor for HSI and 2D LIF measurements, which could be used for drill-core logging in REE exploration, as well as in recovery plants.
The Potential of Reflectance and Laser Induced Luminescence Spectroscopy for Near-Field Rare Earth Element Detection in Mineral Exploration
TLDR
It is demonstrated that the cross-validation of results from both methods increases the robustness and sensitivity, provides the potential for semi-quantification and enables the time- and cost-efficient detection of economically important REE, including Ce, Pr, Nd, Sm, Eu, Dy, Er, Yb and potentially also Ho and Tm.
Color centers, associated rare-earth ions and the origin of coloration in natural fluorites
Natural colored fluorites were studied by means of optical absorption and electron paramagnetic resonance (EPR). Complex centers involving rare-earth ions and/or oxygen give rise to the various
The luminescence properties of rare-earth ions in natural fluorite
For the first time, the luminescence properties of Pr3+, Nd3+ and Tm3+ and Yb3+ ions in fluorite crystal have been obtained by steady-state measurements. In addition, the luminescence spectra of
Spectrum of Trivalent Erbium Ion in the Matrix of Calcium Fluoride
In the following article the absorption and emission spectra of CaF2:Er3+ are presented, discussed, and analyzed phenomenologically. The crystalline states are listed and identified with the free ion
Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems
We show theoretically with the simplest possible model that the intensity of an upconversion luminescence that is excited by the sequential absorption of n photons has a dependence on absorbed pump
A comparative investigation on upconversion luminescence in glass–ceramics containing LaF3 and CaF2 nanocrystals
Greater enhancement in upconversion (UC) luminescence was observed in the glass–ceramics (GCs) containing CaF2:Yb3+, Er3+ nanocrystals (NCs) compared with whose doped with LaF3:Yb3+, Er3+ NCs
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