Abnormal Low Linewidth Temperature Broadening Observed for YVO4:Eu Nanocrystals

Maksimchuk, Pavel; Masalov, A. A.; Seminko, Vladyslav; Viagin, Oleg; Klochkov, Vladimir K.; Malyukin, Yu. V.

doi:10.15407/ujpe57.2.193

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…Table 1 shows the extracted spectral center positions and linewidth at full-width half maximum (FWHM). Good agree is found between these values and those quoted in previous literature, 16,17,28,29 and we therefore expect our PL lifetime to be similar too.…”

Section: B Optical Propertiessupporting

confidence: 92%

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Photoluminescence spectroscopy of YVO4:Eu3+ nanoparticles with aromatic linker molecules: A precursor to biomedical functionalization

Senty

Yalamanchi

Zhang

et al. 2014

Journal of Applied Physics

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Photoluminescence spectra of YVO 4 :Eu 3+ nanoparticles are presented, with and without the attachment of organic molecules that are proposed for linking to biomolecules. YVO 4 :Eu 3+ nanoparticles with 5% dopant concentration were synthesized via wet chemical synthesis. X-ray diffraction and transmission electron microscopy show the expected wakefieldite structure of tetragonal particles with an average size of 17 nm. Fourier-transform infrared spectroscopy determines that metalcarboxylate coordination is successful in replacing native metal-hydroxyl bonds with three organic linkers, namely benzoic acid, 3-nitro 4-chloro-benzoic acid and 3,4-dihydroxybenzoic acid, in separate treatments. UV-excitation photoluminescence spectra show that the position and intensity of the dominant 5 D 0 -7 F 2 electric-dipole transition at 619 nm is unaffected by the benzoic acid and 3-nitro 4-chloro-benzoic acid treatments. Attachment of 3,4-dihydroxybenzoic acid produces an order-ofmagnitude quenching in the photoluminescence, due to the presence of high-frequency vibrational modes in the linker. Ratios of the dominant electric-and magnetic-dipole transitions confirm infrared measurements, which indicate that the bulk crystal of the nanoparticle is unchanged by all three treatments. I. INTRODUCTIONSome biomedical applications 1 seek to use the luminescence of multifunctional nanostructures for targeted drug delivery, labeling or sensing with magnetic manipulation for separation or capture of cells, proteins and nucleic acids. It is essential that the addition of one function does not hinder another. For example, multifunctional nanoparticles (NP) consisting of magnetic cores and photoluminescent (PL) shells have been demonstrated, using Fe cores coated with rare-earth-doped yttrium vanadate (YVO 4 ) as a luminescent shell. 2The advantage of rare-earth-doped crystals is their low toxicity compared to some colloidal quantum dots for biological applications, 3 strong luminescence properties of common ions such as Eu 3+ , Lu 3+ , and Tm 3+ , and background-free emission due to the necessity of indirect excitation via the host material. 4-10 These latter properties are also one of the reasons why rare-earth, particularly lanthanide, doped crystals are used for laser materials and optoelectronics. [11][12][13] These properties are also promising for use as luminescent nanothermometers. 14,15 YVO 4 :Eu 3+ in particular has been shown to have a temperaturedependent linewidth, 16 which can then be exploited to achieve a thermal sensitivity on the nanometer scale. It has been found

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Section: B Optical Propertiessupporting

confidence: 92%

“…[11][12][13] These properties are also promising for use as luminescent nanothermometers. 14,15 YVO 4 :Eu 3+ in particular has been shown to have a temperaturedependent linewidth, 16 which can then be exploited to achieve a thermal sensitivity on the nanometer scale. It has been found…”

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confidence: 99%

Photoluminescence spectroscopy of YVO4:Eu3+ nanoparticles with aromatic linker molecules: A precursor to biomedical functionalization

Senty

Yalamanchi

Zhang

et al. 2014

Journal of Applied Physics

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Processes of excitation energy transport in EuPO4 and EuP3O9 nanocrystals

Kononets

Seminko

Maksimchuk

et al. 2017

Low Temperature Physics

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Processes of excitation energy transport were investigated for EuPO 4 and EuP 3 O 9 nanocrystals, in which Eu 3+ ions form three-and one-dimensional subsystems, respectively. It was determined that for EuPO 4 nanocrystals 5 D 0 luminescence quenching manifested itself even at low temperatures due to effective phononassisted energy migration. At the same time, for EuP 3 O 9 nanocrystals no influence of energy migration on the luminescence quenching was observed in the whole temperature range from 10 to 293 K that can be ascribed to modification of phonon spectra for EuP 3 O 9 nanocrystals as compared to their bulk counterparts.

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Energy migration processes in phosphate nanocrystals: Size and dimensionality dependence

Kononets

Seminko

Maksimchuk

et al. 2018

Low Temperature Physics

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Peculiarities of electronic excitation energy migration in phosphate nanocrystals with three-dimensional (EuPO 4 ) and one-dimensional (EuP 3 O 9 ) arrangement of regular ions under variation of concentration of both energy traps (Nd 3+ ions) and scattering centres (La 3+ ions) are discussed in the paper. Processes of energy migration in both EuPO 4 and EuP 3 O 9 nanocrystals are phonon-assisted ones due to absence of resonance between energy levels of adjacent Eu 3+ ions. The distance of energy migration for both EuPO 4 and EuP 3 O 9 nanocrystals was found to be equal to tens of nanometres, however, for EuPO 4 nanocrystals energy migration leads to stronger quenching of Eu 3+ luminescence. For 10 nm EuPO 4 nanocrystals sufficient hampering of energy migration is observed due to the depletion of the low-energy phonon spectrum as a result of the phonon confinement effect.

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Abnormal Low Linewidth Temperature Broadening Observed for YVO4:Eu Nanocrystals

Cited by 4 publications

References 17 publications

Photoluminescence spectroscopy of YVO4:Eu3+ nanoparticles with aromatic linker molecules: A precursor to biomedical functionalization

Photoluminescence spectroscopy of YVO4:Eu3+ nanoparticles with aromatic linker molecules: A precursor to biomedical functionalization

Processes of excitation energy transport in EuPO4 and EuP3O9 nanocrystals

Energy migration processes in phosphate nanocrystals: Size and dimensionality dependence

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