Hydrothermal Synthesis and Properties of Yb3+/Tm3+ Doped Sr2LaF7 Upconversion Nanoparticles

Milićević, Bojana; Periša, Jovana; Ristić, Zoran; Milenkovic, Katarina; Antić, Željka; Smits, Krisjanis; Ķemere, Meldra; Vı̄tols, Kaspars; Šarakovskis, Anatolijs; Dramićanin, Miroslav

doi:10.3390/nano13010030

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…EDTA was firstly employed in the synthesis of UCNPs by Yi and coworkers [52]. It is employed as a stabilizing and chelating agent able to minimize UCNPs aggregation [53]. EDTA has been described as an efficient complexing agent for trivalent lanthanide ions because it improves the dispersibility of crystals.…”

Section: Synthesis Of Ucnps By Co-precipitation and Sol-gel Methodsmentioning

confidence: 99%

Synthesis of Highly Luminescent Silica-Coated Upconversion Nanoparticles from Lanthanide Oxides or Nitrates Using Co-Precipitation and Sol–Gel Methods

Iglesias-Mejuto,

Lamy-Mendes,

Pina

et al. 2023

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Upconversion nanoparticles (UCNPs) are under consideration for their use as bioimaging probes with enhanced optical performance for real time follow-up under non-invasive conditions. Photostable and core-shell NaYF4:Yb3+, Er3+-SiO2 UCNPs obtained by a novel and simple co-precipitation method from lanthanide nitrates or oxides were herein synthesized for the first time. The sol–gel Stöber method followed by oven or supercritical gel drying was used to confer biocompatible surface properties to UCNPs by the formation of an ultrathin silica coating. Upconversion (UC) spectra were studied to evaluate the fluorescence of UCNPs upon red/near infrared (NIR) irradiation. ζ-potential measurements, TEM analyses, XRD patterns and long-term physicochemical stability were also assessed and confirmed that the UCNPs co-precipitation synthesis is a shape- and phase-controlling approach. The bio- and hemocompatibility of the UCNPs formulation with the highest fluorescence intensity was evaluated with murine fibroblasts and human blood, respectively, and provided excellent results that endorse the efficacy of the silica gel coating. The herein synthesized UCNPs can be regarded as efficient fluorescent probes for bioimaging purposes with the high luminescence, physicochemical stability and biocompatibility required for biomedical applications.

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Section: Synthesis Of Ucnps By Co-precipitation and Sol-gel Methodsmentioning

confidence: 99%

Synthesis of Highly Luminescent Silica-Coated Upconversion Nanoparticles from Lanthanide Oxides or Nitrates Using Co-Precipitation and Sol–Gel Methods

Iglesias-Mejuto,

Lamy-Mendes,

Pina

et al. 2023

Gels

View full text Add to dashboard Cite

show abstract

“…The research emphasizes the significance of alkalinity in the synthesis process, detailing the impact on crystal grain size, distribution, and the potential applications of the resulting nanoparticles in electronic materials, showcasing a novel route for doping and tailoring the properties of nanoceramics. The hydrothermal synthesis of nanoparticles is represented by the work of Milićević et al [ 17 ] that focuses on the hydrothermal synthesis of upconversion nanoparticles doped with ytterbium (Yb 3+ ) and thulium (Tm 3+ ), aiming to optimize their luminescent properties for applications in bioimaging and security. The study systematically analyzes the effect of dopant concentrations on emission properties, providing insights into the structural and photoluminescent characteristics of these nanoparticles, and suggesting optimal doping levels for enhanced near-infrared emission.…”

mentioning

confidence: 99%