The effects of Eu-concentrations on the luminescent properties of SrF 2 :Eu nanophosphor

Yagoub, M.Y.A.; Swart, H.C.; Noto, L.L.; O'Connel, J.; Lee, M.E.; Coetsee, E.

doi:10.1016/j.jlumin.2014.08.014

Cited by 44 publications

(35 citation statements)

References 35 publications

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“…The Eu 3d peak consists of two peaks that originated from the spin-orbit splitting, 3d 5/2 and 3d 3/2 of the Eu 2+ oxidation state. 10,22 In our previous XPS investigation of as-prepared SrF 2 :Eu phosphors powders the Eu also showed both the two oxidation states, Eu 2+ and Eu…”

Section: Resultsmentioning

confidence: 88%

“…4,8 Eu 2+ could be used as a sensitizer because it shows a fully allowed 4f-5d transition. 9,10 This transition strongly depends on the crystal field of the matrix. The efficient energy transfer between a sensitizer and a donor can only occur when the emission band of the sensitizer overlap with the excitation band of the donor.…”

Section: +mentioning

confidence: 99%

“…We have recently shown that Eu 2+ doped SrF 2 host emits a blue colour centred at 416 nm. 10 Pr 3+ is capable of emitting when excited at blue region, 14 which overlaps the emission wavelength range of Eu…”

Section: +mentioning

confidence: 99%

“…10 In figure 3( Figure 4 shows the excitation and emission spectra of the singly doped Pr 3+ ions whose charge was compensated locally by the F ions. 7,28,29 The excitation spectrum of The excitation and emission spectra of Eu 2+ in SrF 2 crystal are shown in figure 5.…”

Section: +mentioning

confidence: 99%

“…It is well known that such broad excitation and emission bands are mainly originating from the inter-configuration 4f 6 5d 1 − 4f 7 allowed transition of Eu 2+ ion. 9,10 The inset graph in figure 5 shows the emission intensity variation as a function of Eu 2+ concentration. The maximum luminescence intensity occurred for the sample doped with 1.5 mol% and a further increase in concentration resulted in a decrease in Eu 2+ emission intensity.…”

Section: +mentioning

confidence: 99%

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Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

et al. 2016

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Efficient energy transfer was demonstrated in the SrF2 : Eu2+, Pr3+ phosphor synthesized by the co-precipitation method. Results obtained with X-ray diffraction (XRD), scanning electron microscopy (SEM), x-ray spectroscopy (XPS), photoluminescence (PL) and decay curves proposed the UV-Vis energy transfer process. The energy transfer process between the Eu2+ and Pr3+ ions in SrF2 was investigated to evaluate the potential of the Eu2+ ion as a sensitizer for the Pr3+ ion. The results proposed that Eu2+ could be a good sensitizer for absorbing the UV photons and efficiently enhancing the Pr3+ emission intensity. The energy transfer process was effective until concentration quenching for the Pr3+ ions occurred. The concentration quenching was attributed to cross-relaxation between the Pr3+ ions.

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Section: Resultsmentioning

confidence: 88%

Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

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Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

et al. 2016

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Size‐Dependent Blue Emission from Europium‐Doped Strontium Fluoride Nanoscintillators for X‐Ray‐Activated Photodynamic Therapy

Policei Marques,

Isikawa,

Muradova

et al. 2024

Adv Healthcare Materials

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Successful implementation of X‐ray‐activated photodynamic therapy (X‐PDT) is challenging because most photosensitizers (PSs) absorb light in the blue region, but few nanoscintillators produce efficient blue scintillation. Here, we developed efficient blue‐emitting SrF2:Eu scintillating nanoparticles. Our optimized synthesis conditions resulted in cubic nanoparticles with 32 nm diameter and blue emission at 416 nm. Coating them with the porphyrin TMPyP in a core‐shell structure (SrF@TMPyP) resulted in maximum singlet oxygen (1O2) generation upon X‐ray irradiation for nanoparticles with 6 TMPyP depositions (SrF@6TMPyP). The 1O2 generation was directly proportional to the dose, did not vary in the low energy X‐ray range (48‐160 kVp), but was 21% higher when irradiated with low‐energy X‐rays than irradiations with higher energy gamma rays. In the clonogenic assay, cancer cells treated with SrF@6TMPyP and exposed to X‐rays presented a significantly reduced survival fraction compared to the controls. The SrF2:Eu Scintillating nanoparticles (ScNPs) and their conjugates stand out as tunable nanoplatforms for X‐PDT due to the efficient blue emission from the SrF2:Eu cores; the ability to adjust the scintillation emission in terms of color and intensity by controlling the nanoparticle size; the efficient 1O2 production when conjugated to a PS and, the efficacy of killing cancer cells.This article is protected by copyright. All rights reserved

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Simultaneous Measurement of the Emission Quantum Yield and Local Temperature: The Illustrative Example of SrF₂:Yb³⁺/Er³⁺ Single Crystals

et al. 2020

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The emission quantum yield is one of the key figures of merit to evaluate the photoluminescence performance of luminescent materials. The emission quantum yield of upconverting materials is still not widely reported due to technical difficulties and intricate dependence on the excitation power density that is mirrored in a temperature increase. This work describes the simultaneous determination of the emission quantum yield (for both downshifting and upconverting processes) and of the temperature by using the output of a commercial integrating sphere. The temperature is calculated by primary luminescence thermometry through the Boltzmann equation, analyzing the intensity ratio between the 2H11/2, 4S3/2→4I15/2 transitions. The procedure is illustrated using of SrF2: Yb3+/Er3+ single crystals with distinct Yb3+ compositions and the effect of the Yb3+ content on the emission quantum yield and the temperature increase of the sample.

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The effects of Eu-concentrations on the luminescent properties of SrF 2 :Eu nanophosphor

Cited by 44 publications

References 35 publications

Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

Size‐Dependent Blue Emission from Europium‐Doped Strontium Fluoride Nanoscintillators for X‐Ray‐Activated Photodynamic Therapy

Simultaneous Measurement of the Emission Quantum Yield and Local Temperature: The Illustrative Example of SrF₂:Yb³⁺/Er³⁺ Single Crystals

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The effects of Eu-concentrations on the luminescent properties of SrF 2 :Eu nanophosphor

Cited by 44 publications

References 35 publications

Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

Size‐Dependent Blue Emission from Europium‐Doped Strontium Fluoride Nanoscintillators for X‐Ray‐Activated Photodynamic Therapy

Simultaneous Measurement of the Emission Quantum Yield and Local Temperature: The Illustrative Example of SrF2:Yb3+/Er3+ Single Crystals

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Simultaneous Measurement of the Emission Quantum Yield and Local Temperature: The Illustrative Example of SrF₂:Yb³⁺/Er³⁺ Single Crystals