Dopant ion concentration-dependent upconversion luminescence of cubic SrF2:Yb3+,Er3+ nanocrystals prepared by a fluorolytic sol–gel method

Monks, Melissa-Jane; Würth, Christian; Kemnitz, Erhard; Resch‐Genger, Ute

doi:10.1039/d2nr02337g

Cited by 10 publications

(4 citation statements)

References 56 publications

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“…Comparison with previously published studies of the up-conversion luminescence quantum yield of the SrF 2 :Yb:Er solid solutions in the form of both particles and single crystals 1,32,33,38 (Table 3) confirms the observed dependence of the up-conversion luminescence quantum yield on the particle size. The observed differences can be explained by different measurement techniques of the up-conversion luminescence quantum yield.…”

Section: Resultssupporting

confidence: 87%

“…Monks et al 32 reported a quantum yield of 1.1% under an excitation intensity of 30 W cm À2 for the SrF 2 :Yb(13.5 mol%): Er(1.3 mol%) nanoparticles with an average size of about 15 nm. Kuznetsov et al 33 demonstrated the quantum yield of 2.8% in the SrF 2 :Yb(2.0 mol%):Er(2.0 mol%) powders with an average particle size of 120 nm at an excitation intensity of 10 W cm À2 .…”

Section: Introductionmentioning

confidence: 99%

“…Monks et al . 32 reported a quantum yield of 1.1% under an excitation intensity of 30 W cm −2 for the SrF 2 :Yb(13.5 mol%):Er(1.3 mol%) nanoparticles with an average size of about 15 nm. Kuznetsov et al .…”

Section: Introductionmentioning

confidence: 99%

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Effect of the fluorinating agent type (NH₄F, NaF, KF) on the particle size and emission properties of SrF₂:Yb:Er luminophores

Ermakova,

Madirov,

Fedorov

et al. 2024

J. Mater. Chem. C

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Effect of the fluorinating agent type (NH₄F, NaF, KF) on the particle size and emission properties of SrF₂:Yb:Er luminophores

Ermakova,

Madirov,

Fedorov

et al. 2024

J. Mater. Chem. C

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“…Various methods are used for the synthesis of strontium fluoride powders [33,34], including precipitation from aqueous solutions [13-15, 35, 36], hydro-and solvothermal synthesis [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51], synthesis from solutions in a melt (flux technique) [52][53][54], sol-gel [55][56][57][58][59], combustion synthesis [60,61], synthesis using ionic liquids [52], thermal decomposition of precursors [62], high-energy ball milling [63], chemical reaction at the solution/vapor interface [64], etc. In the synthesis by precipitation from aqueous solutions by chemical reactions, various fluorinating agents were used -solutions of hydrofluoric acid [35], sodium fluoride [36,65], potassium fluoride [13-15, 36, 65], and ammonium fluoride [12,22,36].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of strontium fluoride nanoparticles in a microreactor with intensely swirling flows

Abiev,

Zdravkov,

Kudryashova

et al. 2024

Nanosystems: Phys. Chem. Math.

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The technique of micromixing was used for synthesis of SrF 2 nanopowders in a microreactor with intensely swirling flows. The chemical reaction between aqueous solutions of strontium nitrate (C(Sr(NO 3 ) 2 ) = 0.15 -0.45 M) and potassium fluoride (C(KF) = 0.3 -0.9 M) was realized in a microreactor with intensely swirling flows with reagent consumption 1.5 -3.5 L/min. Colloidal solutions were obtained, during the settling of which SrF 2 powders were isolated without crystallographic faceting. An increase in the rate of reagent flow has negligible effect on the size of coherent scattering regions D, while an increase in the concentration of solutions leads to an increase in D from ∼ 20 to ∼ 30 nm. KEYWORDS strontium fluoride, precipitation, chemical reaction, micromixing ACKNOWLEDGEMENTS This work was done as a part of State assignment of the Institute of Silicate Chemistry (Project No.

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Tuning Near‐Infrared‐to‐Ultraviolet Upconversion in Lanthanide‐Doped Nanoparticles for Biomedical Applications

Wei

Zheng

Zhang

et al. 2022

Advanced Optical Materials

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converting NIR light to UV and vis light owing to several merits such as low toxicity, [11] high stability, [12] and minimal photo bleaching. [13] Ln-doped UCNPs can be readily prepared by several complementary methods such as co-precipitation, [14] thermal decomposition, [15] and thermal injection. [16] The as-synthesized nanoparticles can also be readily modified by silica, [17] mesoporous silica, [18] and hydrophilic molecules [19] with good biocompatibility. Importantly, UCNPs can easily convert multiwavelength NIR light to tunable UV light by doping different lanthanide ions [20] such as Yb 3+ , Nd 3+ , Er 3+ , Tm 3+ , and Gd 3+ . [21] Compared with visible emissions, the high-energy UV photons enable effective simulation of various photoactivatable systems, thus, making these UCNPs attractive nanoplatforms for light-controlled diagnosis and therapy in biomedicine. [22] This review focuses on the recent developments of NIR-to-UV UCNPs and the relevant applications in biomedicine. In Section 2, we survey the strategies for tuning UV emissions in Ln-doped UCNPs by excitations of NIR lasers at different wavelengths. In Section 3, we highlight the emerging applications of NIR-to-UV UCNPs in biomedical diagnosis and therapy. Strategies for NIR-to-UV UpconversionTo realize NIR-to-UV upconversion emission, a sensitizer with a sufficient absorption cross-section in the NIR region is essential. The selection of appropriate sensitizer co-doped along with the activator through an efficient energy transfer process could realize strong UV upconversion emissions under different excitation wavelengths (Figure 1). For example, Yb 3+ is an ideal sensitizer for 980 nm excitation because of its larger absorption cross-section at around 980 nm than other lanthanide ions due to the 2 F 7/2 → 2 F 5/2 transition. [23] Additionally, the 2 F 5/2 → 2 F 7/2 transition of Yb 3+ well matches electronic transitions in typical upconverting activators (e.g., Er 3+ , Tm 3+ , and Ho 3+ ) that facilitates energy transfer upconversion (ETU). [24] Nd 3+ is particularly suitable for use as a sensitizer to absorb shorter-wavelength laser due to its multiple NIR excitation bands at 730, 808, and 865 nm, corresponding to transitions from the 4 I 9/2 state to the 4

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Dopant ion concentration-dependent upconversion luminescence of cubic SrF₂:Yb³⁺,Er³⁺ nanocrystals prepared by a fluorolytic sol–gel method

Abstract: P-dependent relative spectral UCL distributions reveal different UCL quenching pathways in cubic phase SrF2:Yb3+,Er3+ and popular β-NaYF4:Yb3+,Er3+.

Cited by 10 publications

References 56 publications

Effect of the fluorinating agent type (NH₄F, NaF, KF) on the particle size and emission properties of SrF₂:Yb:Er luminophores

Effect of the fluorinating agent type (NH₄F, NaF, KF) on the particle size and emission properties of SrF₂:Yb:Er luminophores

Synthesis of strontium fluoride nanoparticles in a microreactor with intensely swirling flows

Tuning Near‐Infrared‐to‐Ultraviolet Upconversion in Lanthanide‐Doped Nanoparticles for Biomedical Applications

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Dopant ion concentration-dependent upconversion luminescence of cubic SrF2:Yb3+,Er3+ nanocrystals prepared by a fluorolytic sol–gel method

Abstract: P-dependent relative spectral UCL distributions reveal different UCL quenching pathways in cubic phase SrF2:Yb3+,Er3+ and popular β-NaYF4:Yb3+,Er3+.

Cited by 10 publications

References 56 publications

Effect of the fluorinating agent type (NH4F, NaF, KF) on the particle size and emission properties of SrF2:Yb:Er luminophores

Effect of the fluorinating agent type (NH4F, NaF, KF) on the particle size and emission properties of SrF2:Yb:Er luminophores

Synthesis of strontium fluoride nanoparticles in a microreactor with intensely swirling flows

Tuning Near‐Infrared‐to‐Ultraviolet Upconversion in Lanthanide‐Doped Nanoparticles for Biomedical Applications

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Dopant ion concentration-dependent upconversion luminescence of cubic SrF₂:Yb³⁺,Er³⁺ nanocrystals prepared by a fluorolytic sol–gel method

Effect of the fluorinating agent type (NH₄F, NaF, KF) on the particle size and emission properties of SrF₂:Yb:Er luminophores

Effect of the fluorinating agent type (NH₄F, NaF, KF) on the particle size and emission properties of SrF₂:Yb:Er luminophores