Photostable and Small YVO4:Yb,Er Upconversion Nanoparticles in Water

Alkahtani, Masfer; Alfahd, Anfal; Alsofyani, Najla; Almuqhim, Anas A.; Qassem, Hussam; Alshehri, Abdullah A.; Almughem, Fahad A.; Hemmer, Philip

doi:10.3390/nano11061535

Cited by 12 publications

(8 citation statements)

References 28 publications

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“…SEM and TEM images (Figure b,c) show that the nanoparticles are elongated ellipsoidal crystallites with the lengths of 30 nm, and their formed clusters are at the lengths of 300 nm . This size of aggregation is not a problem for our application, but the solutions could be considered to limit it. − The HRTEM image (Figure d) shows a well-defined crystal structure with a lattice fringe distance of 0.27 and 0.47 nm which corresponds to the (112) and (101) interplanar spacing of GdVO 4 , respectively (JCPDS 17-0260). A porous cell-like nanostructure can also be observed, and these voids are the result of high temperature atomic diffusion …”

Section: Results and Discussionmentioning

confidence: 96%

Laser-Induced Heating in GdVO₄: Yb³⁺/Er³⁺ Nanocrystals for Thermometry

Zhou

Ledoux

Philippon

et al. 2022

ACS Appl. Nano Mater.

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Photoluminescent temperature sensors based on gadolinium orthovanadate (GdVO4) doped with 10% ytterbium and 2% erbium are developed and dispersed in different media (lubricant fluid, sol–gel glass, and PDMS) to evaluate the best conditions for temperature measurement. Two excitation modes are considered: (i) visible excitation by a downshifting (DS) process or (ii) NIR excitation by energy transfer upconversion (UC) between Yb and Er. The luminescence intensity ratio (LIR) of the thermally coupled Er3+ emission peaks varies linearly with temperature in the range of 25–300 °C, and this variation is reversible. The impact of the laser power density on thermometry via the UC process that has been verified with GdVO4: Yb3+/Er3+ powders and with its different dilutions (low and high concentration) shows that the LIR is highly dependent on the laser source intensity, the environmental temperature, and the dispersed medium. When GdVO4: Yb3+/Er3+ powders are dispersed at high concentration, high laser power density leads to significant laser-induced thermal heating. However, at low concentration, this laser thermal effect is no longer influenced by the laser intensity. In this paper, we propose a method to directly measure the laser-induced heating temperature and to correct the error caused by this effect on temperature measurement. According to these results, GdVO4: Yb3+/Er3+ upconversion nanoparticles can be applied for temperature sensing even if the laser-induced thermal effect occurs in the system.

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Section: Results and Discussionmentioning

confidence: 96%

Laser-Induced Heating in GdVO₄: Yb³⁺/Er³⁺ Nanocrystals for Thermometry

Zhou

Ledoux

Philippon

et al. 2022

ACS Appl. Nano Mater.

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“…The in vitro cytotoxicity assessment of liposomal formulations was performed using an MTS assay, according to [ 38 ]. The experiment was conducted against the A549 cell line to evaluate the cellular metabolic activity of the cells following the application of the investigated formulations.…”

Section: Methodsmentioning

confidence: 99%

Liposome-Encapsulated Tobramycin and IDR-1018 Peptide Mediated Biofilm Disruption and Enhanced Antimicrobial Activity against Pseudomonas aeruginosa

et al. 2022

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The inadequate eradication of pulmonary infections and chronic inflammation are significant complications in cystic fibrosis (CF) patients, who usually suffer from persistent and frequent lung infections caused by several pathogens, particularly Pseudomonas aeruginosa (P. aeruginosa). The ability of pathogenic microbes to protect themselves from biofilms leads to the development of an innate immune response and antibiotic resistance. In the present work, a reference bacterial strain of P. aeruginosa (PA01) and a multidrug-resistant isolate (MDR 7067) were used to explore the microbial susceptibility to three antibiotics (ceftazidime, imipenem, and tobramycin) and an anti-biofilm peptide (IDR-1018 peptide) using the minimum inhibition concentration (MIC). The most effective antibiotic was then encapsulated into liposomal nanoparticles and the IDR-1018 peptide with antibacterial activity, and the ability to disrupt the produced biofilm against PA01 and MDR 7067 was assessed. The MIC evaluation of the tobramycin antibacterial activity showed an insignificant effect on the liposomes loaded with tobramycin and liposomes encapsulating tobramycin and IDR-1018 against both P. aeruginosa strains to free tobramycin. Nevertheless, the biofilm formation was significantly reduced (p < 0.05) at concentrations of ≥4 μg/mL and ≤32 μg/mL for PA01 and ≤32 μg/mL for MDR 7067 when loading tobramycin into liposomes, with or without the anti-biofilm peptide compared to the free antibiotic, empty liposomes, and IDR-1018-loaded liposomes. A tobramycin concentration of ≤256 µg/mL was safe when exposed to a lung carcinoma cell line upon its encapsulation into the liposomal formulation. Tobramycin-loaded liposomes could be a potential candidate for treating lung-infected animal models owing to the high therapeutic efficacy and safety profile of this system compared to the free administration of the antibiotic.

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“…However, so far the photovoltaic performance of PSCs, fabricated with a Yb-Er-Li tri-doped TiO 2 hybrid system, have shown a relatively low PCE of 16% [29] in comparison to PSCs fabricated with fluoride-based UCNPs [13] and lithium-doped TiO 2 as reported in [10]. This low performance could be attributed to low quantum efficiency of UCNPs, doped in oxide crystals, due to their relatively high phonon energy [38,39]. In contrast, fluoride crystals have a lower phonon energy, and give relatively higher quantum efficiency because the low phonon energy slows the decay of the intermediate state by requiring multiphonon relaxations [40,41].…”

Section: Introductionmentioning

confidence: 98%

Lithium-Based Upconversion Nanoparticles for High Performance Perovskite Solar Cells

et al. 2021

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In this work, we report an easy, efficient method to synthesize high quality lithium-based upconversion nanoparticles (UCNPs) which combine two promising materials (UCNPs and lithium ions) known to enhance the photovoltaic performance of perovskite solar cells (PSCs). Incorporating the synthesized YLiF4:Yb,Er nanoparticles into the mesoporous layer of the PSCs cells, at a certain doping level, demonstrated a higher power conversion efficiency (PCE) of 19%, additional photocurrent, and a better fill factor (FF) of 82% in comparison to undoped PSCs (PCE = ~16.5%; FF = 71%). The reported results open a new avenue toward efficient PSCs for renewable energy applications.

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Photostable and Small YVO4:Yb,Er Upconversion Nanoparticles in Water

Cited by 12 publications

References 28 publications

Laser-Induced Heating in GdVO₄: Yb³⁺/Er³⁺ Nanocrystals for Thermometry

Laser-Induced Heating in GdVO₄: Yb³⁺/Er³⁺ Nanocrystals for Thermometry

Liposome-Encapsulated Tobramycin and IDR-1018 Peptide Mediated Biofilm Disruption and Enhanced Antimicrobial Activity against Pseudomonas aeruginosa

Lithium-Based Upconversion Nanoparticles for High Performance Perovskite Solar Cells

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Photostable and Small YVO4:Yb,Er Upconversion Nanoparticles in Water

Cited by 12 publications

References 28 publications

Laser-Induced Heating in GdVO4: Yb3+/Er3+ Nanocrystals for Thermometry

Laser-Induced Heating in GdVO4: Yb3+/Er3+ Nanocrystals for Thermometry

Liposome-Encapsulated Tobramycin and IDR-1018 Peptide Mediated Biofilm Disruption and Enhanced Antimicrobial Activity against Pseudomonas aeruginosa

Lithium-Based Upconversion Nanoparticles for High Performance Perovskite Solar Cells

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Product

Resources

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Laser-Induced Heating in GdVO₄: Yb³⁺/Er³⁺ Nanocrystals for Thermometry

Laser-Induced Heating in GdVO₄: Yb³⁺/Er³⁺ Nanocrystals for Thermometry