Concentration quenching, surface and spectral analyses of SrF2:Pr3+ prepared by different synthesis techniques

Yagoub, M.Y.A.; Swart, H.C.; Coetsee, E.

doi:10.1016/j.optmat.2015.01.011

Cited by 24 publications

(7 citation statements)

References 28 publications

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“…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%

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: +mentioning

confidence: 99%

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

et al. 2016

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“…XPS analysis was performed to provide additional information about the valence states of the elements of which the samples consisted. Particular emphasis was placed on the study of the valence states of Eu and Bi ions, as well as the chemical states of Sr that could indicate Sr chemical bonds with both fluorine and oxygen [ 24 , 34 , 35 ]. As research has shown, both Eu and Bi ions are in the 3+ valence state.…”

Section: Resultsmentioning

confidence: 99%

“…All spectra consisted of the Sr 3d spin-orbit doublet, but a detailed analysis of these peaks suggests the presence of more than one chemical state of Sr in all samples. Peaks at 133.5 and 135.5 eV could be assigned to the Sr 3d 5/2 and Sr 3d 3/2 in Sr-O [ 34 , 35 ], whereas peaks with energies equal to 134.0 and 136.0 eV could be attributed to Sr 3d 5/2 and Sr 3d 3/2 in Sr-F [ 34 , 35 ]. The contribution of Sr-O and Sr-F doublets in the glasses was 59% and 41% (BBO+10SrF 2 ) and 67% and 33% (BBO+20SrF 2 ), respectively.…”

Section: Resultsmentioning

confidence: 99%

From Structure to Luminescent Properties of B2O3-Bi2O3-SrF2 Glass and Glass-Ceramics Doped with Eu3+ Ions

et al. 2021

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Glass-ceramics with the composition B2O3-Bi2O3-SrF2 were synthesized by the conventional melt-quenching technique and subsequent crystallization of the parental glasses. The temperature at which the ceramization was carried out was selected based on differential scanning calorimetry (DSC) analysis. The structure of the studied materials and the formation of SrF2 nanocrystals were confirmed by the Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. It was found that the amount of strontium fluoride introduced into the parental borate-bismuth glass has a significant impact on the growth of SrF2 nanocrystals. In particular, the influence of the crystalline SrF2 phase on luminescence intensity and kinetics was studied using Eu2O3-doped samples. An increase in luminescence intensity was observed in the samples in which SrF2 nanocrystals were formed. This is most likely related to the fact that some of the Eu3+ ions were (after annealing of the glass) located in the crystalline structure of strontium fluoride. This was confirmed both by the luminescence lifetime obtained based on the luminescence decay curves and the calculated Judd–Ofelt parameters, Ω2 and Ω4. The results achieved confirm that the glasses and glass-ceramics described in this work could be considered as a new phosphor for light-emitting diodes (LEDs).

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“…4). In the visible spectral range, we have recognized characteristic Pr 3+ ion luminescence in 450 -750 nm range [25][26][27] and intense luminescence within 900 -1100 nm range corresponding to 2 F 5/2 − 2 F 7/2 transitions of Yb 3+ ions. The maximum luminescence intensity was recorded for the composition SrF 2 :Pr (0.1 mol.%):Yb (10.0 mol.%).…”

Section: Fig 1 Xrd Patterns For Sample 3: a -After Drying At 45 • Cmentioning

confidence: 89%

Synthesis and quantum yield investigations of the Sr(1-x-y)Pr(x)Yb(y)F(2+x+y) luminophores for photonics

Kuznetsov¹,

Proydakova²,

Морозов³

et al. 2018

Nanosystems: Phys. Chem. Math.

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Single-phase praseodymium-and ytterbium-doped strontium fluoride solid solutions were prepared by co-precipitation from aqueous nitrate solutions followed by annealing at 600 • C. Based on EDX analysis, the content of rare-earth elements in solid phase is slightly higher rather than in initial aqueous solution. All the characteristic praseodymium and ytterbium luminescent bands were present. The most intense luminescence in 800-1100 nm range was registered in SrF 2 :Pr (0.1 mol.%):Yb (10.0 mol.%) solid solution. Using the integrating sphere, the values of the quantum yield were estimated. The maximum quantum yield was 1.1 % for Sr 0.9495 Pr 0.0005 Yb 0.05 F 2.0505 solid solution.

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Concentration quenching, surface and spectral analyses of SrF2:Pr3+ prepared by different synthesis techniques

Cited by 24 publications

References 28 publications

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

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

From Structure to Luminescent Properties of B2O3-Bi2O3-SrF2 Glass and Glass-Ceramics Doped with Eu3+ Ions

Synthesis and quantum yield investigations of the Sr(1-x-y)Pr(x)Yb(y)F(2+x+y) luminophores for photonics

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