Steady-state luminescence measurement for qualitative identification of rare earth ions in minerals

Czaja, M.; Bodył-Gajowska, S.; Mazurak, Z.

doi:10.2465/jmps.111229

Cited by 8 publications

(19 citation statements)

References 13 publications

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“…In the spectral range of 550-700 nm, the emission lines of these two ions are located close to each other and are: at 562 nm and 569 nm as 4 G5/2 → 6 H5/2 transition of Sm 3+ ; at 601 nm and 607 nm of both Sm 3+ 4 G5/2 → 6 H7/2 and Pr 3+ 1 D2 → 3 H4 + 3 P0 → 3 H6 transitions; and at 648 nm mainly for Pr 3+ transition 3 P0 → 3 F2. As it was found earlier [9], the most convenient excitation for Sm 3+ is the 399-402 nm line, while for Pr 3+ it is 480 nm (Figure 10). The photoluminescence spectra of Dy 3+ , Sm 3+ , and Pr 3+ and Ce 3+ .…”

Section: Energy Transfer Ce 3+ -Sm 3+ Pr 3+ and Eu 3+supporting

confidence: 72%

“…However, the emission bands of Er 3+ corresponding to the 2 H11/2 → 4 I15/2, 4 S3/2 → 4 I15/2 and 4 F9/2 → 4 I15/2 transitions and usually measured at a 500-600 nm range were not clearly visible for steady-state luminescence measurements using a xenon lamp excitation, contrary to time-resolved measurements [8]. It has previously been verified [9] that for steady-time measurements using a xenon lamp, the most convenient excitation for Er 3+ is λ = 377 nm. However, for the studied agrellite specimen, only a weak emission band at 543 nm was measured ( Figure 4).…”

Section: Nd 3+ Yb 3+ and Er 3+ Luminescencementioning

confidence: 90%

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Luminescence of Agrellite Specimen from the Kipawa River Locality

Czaja

Lisiecki

2019

Minerals

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Using steady-state luminescence measurements, the luminescence spectra of Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Dy3+, Er3+ and Yb3+ for the agrellite sample from the Kipawa River region have been measured. The emission spectra of Eu3+ and Dy3+ next to those of Sm3+ and Pr3+ have been measured for characteristic excitation conditions. The most efficient luminescence activator in the studied sample was Ce3+. This ion was also a sensitizer of Pr3+, Sm3+, Eu3+, and Dy3+ luminescence.

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Section: Energy Transfer Ce 3+ -Sm 3+ Pr 3+ and Eu 3+supporting

confidence: 72%

Section: Nd 3+ Yb 3+ and Er 3+ Luminescencementioning

confidence: 90%

Luminescence of Agrellite Specimen from the Kipawa River Locality

Czaja

Lisiecki

2019

Minerals

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“…The primary excitation wavelength for Ce 3+ was λ exc =290 nm, according to our earlier studies (Czaja et al 2013). We subsequently verified that the recorded spectrum was correct, i.e., that we did not measure reflections from xenon lamp nor Raman shift.…”

Section: Methodsmentioning

confidence: 52%

Photoluminescence of Ce3+ and Eu2+ in low-P ternesite from the Negev Desert, Israel

2017

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For the first time, the photoluminescence of ions of Ce 3+ and Eu 2+ in natural low-P ternesite has been measured. The emission bands of Ce 3+ ions at 405, 426, and 440 nm and the corresponding excitation wavelengths suggest the presence of Ce 3+ ions in three different cationic sites. In the photoluminescence spectra of Eu 2+ , emission bands at 530 and 620 nm can be seen that originate from two different cationic sites. In addition, it is demonstrated that an energy transfer occurs between Ce 3+ and Eu 2+ ions situated in those cationic sites where the force of the crystallic field is weakest. The photoluminescence spectra were obtained for a thin section sample with low contents of these two elements (41.2 ppm Ce, 2.11 ppm Eu).

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“…Conventional fluorescence has previously been shown as a good qualitative measure of rare earth ion presence in fluorite, though as discussed previously emission can be quenched by energy transfer to other absorbing centres. 67 Another complication that has been noted is the spectral overlay of erbium and holmium emissions, both having visible peaks between 520 and 560 nm. 34 Our experiments have confirmed that conventional fluorescence with monochromatic laser light is suitable for exciting holmium and erbium emissions one at a time, though broader-band excitation sources may not enable distinguishing between the two.…”

Section: Erbium and Holmium Upconversion Fluorescence In Fluoritementioning

confidence: 99%

Upconversion Fluorescence in Naturally Occurring Calcium Fluoride

et al. 2021

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Fluorine can negatively interfere with leach and smelting processes during mineral processing1,2. 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 excitation wavelengths used for fluorescence studies in minerals frequently provide signals that are not clearly host-specific, and hence of limited utility for mineral identification. We show that upconversion fluorescence (UF), a process in which two or more photons are absorbed and one higher-energy photon is emitted, provides a more host-specific fluorescence output, minimising spurious signals in complex environments and therefore greatly improving detection thresholds. Natural samples of fluorite (CaF2), a major fluorine host at many mine sites, have been analysed by near-infrared excitation and have revealed UF from rare earth inclusions. UF was detected in samples with rare earth concentrations as low as 1 part per million, and is therefore considered a potential new sensing modality for real-time fluorite monitoring.

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Steady-state luminescence measurement for qualitative identification of rare earth ions in minerals

Cited by 8 publications

References 13 publications

Luminescence of Agrellite Specimen from the Kipawa River Locality

Luminescence of Agrellite Specimen from the Kipawa River Locality

Photoluminescence of Ce3+ and Eu2+ in low-P ternesite from the Negev Desert, Israel

Upconversion Fluorescence in Naturally Occurring Calcium Fluoride

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