Study of stability of luminescence intensity of b-NaGdF4:Yb:Er nanoparticle colloids in aqueous solution

Kormshchikov, I.D.; Voronov, V. V.; Burikov, Sergey; Dolenko, Tatiana A.; Kuznetsov, S. V.

doi:10.17586/2220-8054-2021-12-2-218-223

Cited by 6 publications

(8 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As it follows from the obtained results, the sizes of most objects do not exceed 50 nm, which indicates that there is no significant aggregation of nanoparticles in suspensions. This is also evidenced by the observation of the colloidal stability of suspensions -for several months there was no precipitation of particles, and the luminescence intensity of complexes in suspensions did not decrease with time, which corresponds to the data we previously obtained [18]. A continuous diode laser with a wavelength of 980 nm (line width of 2 nm) and a pumping intensity of 205 W/cm 2 was used for excitation of the luminescence.…”

Section: Synthesis and Characterization Of The Samplessupporting

confidence: 87%

“…Currently, the most effective up-conversion nanoluminophores have been developed on the basis of substances with gagarinite type crystal structure -NaYF 4 [9,16,17] or NaGdF 4 [5,12,18], which are doped with two types of ions. One (sensitizer ion) has a large absorption cross-section, and the other (activator ion) has high luminescence efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…The sensitizer ion absorbs the excitation energy and non-radiatively transfers it to the activator ion, which then emits up-conversion luminescence. Ytterbium ions often act as sensitizer while erbium, thulium, and holmium ions are used as activators [5,8,9,12,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact of sensitizer Yb and activator Tm on luminescence intensity of beta-NaYF4:Yb/Tm nanoluminophores

Kuznetsov¹,

Burikov²,

Fedyanina³

et al. 2022

Nanosystems: Phys. Chem. Math.

Self Cite

View full text Add to dashboard Cite

In this study, the impact of sensitizer and activator ions concentration on the intensity of upconversion luminescence of nanoluminophores β-NaYF 4 :Yb 3+ /Tm 3+ in dimethyl sulfoxide (DMSO) was investigated. Analysis of all luminescence spectral bands allows one to establish that the ratio of concentrations of ytterbium and thulium ions strongly effects on the luminescent properties of nanoluminophores. Increase of sensitizer concentration at constant activator concentration leads to an increase of the luminescence integral intensity. Optimal concentration of activators at fixed sensitizer concentration was determined: 2 mol.% for thulium and 18 mol.% for ytterbium. The sensitivity of each luminescence spectrum band to changes in the concentration of activators and sensitizers was explained by cross-relaxation processes in activator ions. KEYWORDS up-conversion luminescence, nanoluminophores, rare earth elements, sensitizer, activator ACKNOWLEDGEMENTS This research was performed according to the Development Program of the Interdisciplinary Scientific and Educational School of Lomonosov Moscow State University "Photonic and Quantum technologies. Digital medicine". The study of the structure was carried out on the equipment of the Center Collective Use "Materials Science and Metallurgy" with the financial support of the Russian Federation represented by the Ministry of Education and Science (No. 075-15-2021-696).

show abstract

Section: Synthesis and Characterization Of The Samplessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of sensitizer Yb and activator Tm on luminescence intensity of beta-NaYF4:Yb/Tm nanoluminophores

Kuznetsov¹,

Burikov²,

Fedyanina³

et al. 2022

Nanosystems: Phys. Chem. Math.

Self Cite

View full text Add to dashboard Cite

show abstract

“…PVP is commonly used as a coating for silver NPs and as a drug carrier [25,28,29]. However, several authors have also used PVP as a coating for UCNPs [25,[30][31][32][33][34].…”

Section: Polyvinylpyrrolidonementioning

confidence: 99%

Nanotoxicological Assessments of Upconversion Nanoparticles

Chávez-García,

Juarez-Moreno

2024

Toxicity of Nanoparticles - Recent Advances and New Perspectives

View full text Add to dashboard Cite

Upconversion nanoparticles (UCNPs) are highly efficient luminescent nanomaterials with emission in the visible spectra while being excited by near-infrared region light (NIR). With their unique properties such as high luminescence intensity, sharp emission peaks with narrow bandwidth, large anti-Stokes’ shift, and sizes smaller than 100 nm, UCNPs have emerged as promising candidates for diverse biomedical applications such as cancer detection and therapy, fluorescence imaging, magnetic resonance imaging (MRI), and drug delivery. The UCNPs are composed of a crystalline matrix doped with lanthanide ions that can absorb NIR light (~980 nm) and upconvert it to visible light. However, to achieve successful biomedical applications, proper functionalization, target-specific cell interaction, and biocompatibility are critical factors that must be considered. Additionally, a comprehensive nanotoxicological assessment is necessary to ensure that UCNPs are not cytotoxic or genotoxic. This assessment is particularly important for long-term studies of nanoparticles’ tracking in vivo. Therefore, this chapter aims to provide an in-depth evaluation of the nanotoxicological issues related to nanoparticles (NPs) and UCNPs in biomedical applications, and ensure their safety and efficacy as bioimaging and chemotherapeutic delivery tools.

show abstract

“…The role of sensitizers is often played by ions of ytterbium, while ions of thulium, erbium or holmium are used as activators [3,5,6,11,15,16]. The role of inert matrices is often played by substances with crystalline structure of gagarinite type: NaYF 4 [15,16] or NaGdF 4 [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of the intensity of exciting radiation on the luminescent properties of nanopowders NaYF-=SUB=-4-=/SUB=- : Yb/Tm

S.A.

E.A.

A.A.

et al. 2022

Optics and Spectroscopy

View full text Add to dashboard Cite

Intensity of the bands of upconversion luminescence of β-NaYF4 : Yb3+/Tm3+ nanopowders in DMSO suspensions vs intensity of exciting radiation were analyzed. Ranges of changes in the intensity of excitation have been established, in which either the processes of energy transfer from the sensitizer ion to the activator ion or the decay of intermediate levels of activator ions dominate. Keywords: rare earth ions, upconversion luminescence, nanoparticle suspensions, sensitizer, activator.

show abstract

Study of stability of luminescence intensity of b-NaGdF4:Yb:Er nanoparticle colloids in aqueous solution

Cited by 6 publications

References 24 publications

Impact of sensitizer Yb and activator Tm on luminescence intensity of beta-NaYF4:Yb/Tm nanoluminophores

Impact of sensitizer Yb and activator Tm on luminescence intensity of beta-NaYF4:Yb/Tm nanoluminophores

Nanotoxicological Assessments of Upconversion Nanoparticles

Influence of the intensity of exciting radiation on the luminescent properties of nanopowders NaYF-=SUB=-4-=/SUB=- : Yb/Tm

Contact Info

Product

Resources

About