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Publications (10 of 18) Show all publications
Zur, L. Z., Armellini, C., Belmokhtar, S., Bouajaj, A., Cattaruzza, E., Chiappini, A., . . . Enrichi, F. (2019). Comparison between glass and glass-ceramic silica-hafnia matrices on the down-conversion efficiency of Tb3+/Yb3+ rare earth ions. Optical materials (Amsterdam), 87, 102-106
Open this publication in new window or tab >>Comparison between glass and glass-ceramic silica-hafnia matrices on the down-conversion efficiency of Tb3+/Yb3+ rare earth ions
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2019 (English)In: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 87, p. 102-106Article in journal (Refereed) Published
Abstract [en]

In this paper, the investigation of energy transfer efficiency in Tb3+-Yb3+ co-doped SiO2-HfO2 glass and glass-ceramic waveguides is presented. Cooperative energy transfer between these two ions allows to cut one UV or 488 nm photon in two 980 nm photons and could have important applications in improving the performance of photovoltaic solar cells. Thin films with different molar concentrations of rare earths, up to a total concentration of 21%, were prepared by a sol-gel route, using dip-coating deposition technique on SiO2 substrates. The ratio between Yb3+ and Tb3+ ions in all the prepared thin films is constant and equal to 4. The energy transfer between Tb3+ and Yb3+ ions in glass and glass-ceramic waveguides shows the higher efficiency for glass-ceramic with a maximum quantum transfer efficiency of about 190% for the sample containing 19% of rare earths.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Rare earths, Down-conversion, Energy transfer, Waveguides, Sol-gel
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-68810 (URN)10.1016/j.optmat.2018.05.008 (DOI)000457505900020 ()2-s2.0-85047221245 (Scopus ID)
Note

Konferensartikel i tidskrift

Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2019-03-08Bibliographically approved
Zairov, R., Dovzhenko, A., Sapunova, A., Voloshina, A., Tatarinov, D., Nizameev, I., . . . Mustafina, A. (2019). Dual red-NIR luminescent Eu–Yb heterolanthanide nanoparticles as promising basis for cellular imaging and sensing. Materials science & engineering. C, biomimetic materials, sensors and systems, 105, Article ID 110057.
Open this publication in new window or tab >>Dual red-NIR luminescent Eu–Yb heterolanthanide nanoparticles as promising basis for cellular imaging and sensing
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2019 (English)In: Materials science & engineering. C, biomimetic materials, sensors and systems, ISSN 0928-4931, E-ISSN 1873-0191, Vol. 105, article id 110057Article in journal (Refereed) Published
Abstract [en]

The present work introduces ternary Ln(III) (Ln = Eu, Yb, Lu) complexes with thenoyltriflouro1,3-diketonate (TTA−) and phosphine oxide derivative (PhO) as building blocks for core-shell nanoparticles with both Eu(III)- or Yb(III)-centered luminescence and the dual Eu(III)-Yb(III)-centered luminescence. Solvent-mediated self-assembly of the complexes is presented herein as the procedure for formation of Eu–Lu, Eu–Yb and Yb–Lu heterometallic or homometallic cores coated by hydrophilic polystyrenesulfonate-based shells. Steady state and time resolved Eu-centered luminescence in homolanthanide and heterolanthanide Eu–Lu and Eu–Yb cores is affected by Eu → Eu and Eu → Yb energy transfer due to a close proximity of the lanthanide blocks within the core of nanoparticles. The Eu → Yb energy transfer is highlighted to be the reason for the enhancement of the NIR Yb-centered luminescence. Efficient cellular uptake, low cytotoxicity towards normal and cancer cells, and sensing ability of Eu–Yb nanoparticles on lomefloxacin additives via both red and NIR channels make them promising as cellular imaging agents and sensors.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Mixed ligand complexesHeterolanthanide nanoparticles, Dual luminescence, Energy transfer, Cellular imaging, Sensors, Fluoroquinolones
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-75610 (URN)10.1016/j.msec.2019.110057 (DOI)31546380 (PubMedID)2-s2.0-85070189572 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-08-20 (svasva)

Available from: 2019-08-20 Created: 2019-08-20 Last updated: 2019-10-09Bibliographically approved
Bortoluzzi, M., Castro, J., Girotto, M., Enrichi, F. & Vomiero, A. (2019). Luminescent copper(I) coordination polymer with 1-methyl-1H-benzotriazole, iodide and acetonitrile as ligands. Inorganic Chemistry Communications, 102, 141-146
Open this publication in new window or tab >>Luminescent copper(I) coordination polymer with 1-methyl-1H-benzotriazole, iodide and acetonitrile as ligands
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2019 (English)In: Inorganic Chemistry Communications, ISSN 1387-7003, E-ISSN 1879-0259, Vol. 102, p. 141-146Article in journal (Refereed) Published
Abstract [en]

The Cu(I) coordination polymer [Cu33-I)3(μ-btzMe)(NCCH3)]n (btzMe = 1-methyl-1H-benzotriazole) was prepared and characterized by X-Ray diffraction. The compound showed strong green emission upon excitation with wavelengths below 475 nm, with lifetime of 47 μs. The emission was attributed to 3(X,M)LCT transition on the basis of experimental data and DFT calculations.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Copper iodide, Coordination polymer, N-donor ligands, Luminescence
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-73034 (URN)10.1016/j.inoche.2019.02.016 (DOI)000462803900027 ()2-s2.0-85061636648 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-08-19 (johcin)

Available from: 2019-02-27 Created: 2019-02-27 Last updated: 2019-08-19Bibliographically approved
Marin, R., Vivian, A., Skripka, A., Migliori, A., Morandi, V., Enrichi, F., . . . Canton, P. (2019). Mercaptosilane-Passivated CuInS2 Quantum Dots for Luminescence Thermometry and Luminescent Labels. ACS Applied Nano Materials, 2(4), 2426-2436
Open this publication in new window or tab >>Mercaptosilane-Passivated CuInS2 Quantum Dots for Luminescence Thermometry and Luminescent Labels
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2019 (English)In: ACS Applied Nano Materials, ISSN 2574-0970, Vol. 2, no 4, p. 2426-2436Article in journal (Refereed) Published
Abstract [en]

Bright and nontoxic quantum dots (QDs) are highly desirable in a variety of applications, from solid-state devices to luminescent probes in assays. However, the processability of these species is often curbed by their surface chemistry, which limits their dispersibility in selected solvents. This renders a surface modification step often mandatory to make the QDs compatible with the solvent of interest. Here, we present a new synthetic approach to produce CuInS2 QDs compatible with organic polar solvents and readily usable for the preparation of composite materials. 3-Mercaptopropyl trimethoxysilane (MPTS) was used simultaneously as solvent, sulfur source, and capping agent for the QD synthesis. The synthesized QDs possessed a maximum photoluminescence quantum yield around 6%, reaching approximately 55% after growing a ZnS shell. The partial condensation of MPTS molecules on the surface of QDs was probed by solid-state nuclear magnetic resonance, whose results were used to interpret the interaction of the QDs with different solvents. To prove the versatility of the developed QDs, imparted by the thiolated silane molecules, we prepared via straightforward procedures two nanocomposites of practical interest: (i) silica nanoparticles decorated with QDs and (ii) an inexpensive polymeric film with embedded QDs. We further demonstrate the potential of this composite film as a luminescence thermometer operational over a broad temperature interval, with relative thermal sensitivity above 1% K–1 in the range of biological interest.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
CuInS2, silane, quantum dots, composites, luminescent films, thiolates, luminescence thermometry
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-74420 (URN)10.1021/acsanm.9b00317 (DOI)000466443000072 ()
Note

Validerad;2019;Nivå 2;2019-06-12 (johcin)

Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-06-12Bibliographically approved
You, S., Patelli, A., Ghamgosar, P., Cesca, T., Enrichi, F., Mattei, G. & Vomiero, A. (2019). Tuning ZnO nanorods photoluminescence through atmospheric plasma treatments. APL Materials, 7(8), Article ID 08111.
Open this publication in new window or tab >>Tuning ZnO nanorods photoluminescence through atmospheric plasma treatments
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2019 (English)In: APL Materials, ISSN 2166-532X, Vol. 7, no 8, article id 08111Article in journal (Refereed) Published
Abstract [en]

Room temperature atmospheric plasma treatments are widely used to activate and control chemical functionalities at surfaces. Here, we investigated the effect of atmospheric pressure plasma jet (APPJ) treatments in reducing atmosphere (Ar/1‰ H2 mixture) on the photoluminescence (PL) properties of single crystal ZnO nanorods (NRs) grown through hydrothermal synthesis on fluorine-doped tin oxide glass substrates. The results were compared with a standard annealing process in air at 300 °C. Steady-state photoluminescence showed strong suppression of the defect emission in ZnO NRs for both plasma and thermal treatments. On the other side, the APPJ process induced an increase in PL quantum efficiency (QE), while the annealing does not show any improvement. The QE in the plasma treated samples was mainly determined by the near band-edge emission, which increased 5–6 fold compared to the as-prepared samples. This behavior suggests that the quenching of the defect emission is related to the substitution of hydrogen probably in zinc vacancies (VZn), while the enhancement of UV emission is due to doping originated by interstitial hydrogen (Hi), which diffuses out during annealing. Our results demonstrate that atmospheric pressure plasma can induce a similar hydrogen doping as ordinarily used vacuum processes and highlight that the APPJ treatments are not limited to the surfaces but can lead to subsurface modifications. APPJ processes at room temperature and under ambient air conditions are stable, convenient, and efficient methods, compared to thermal treatments to improve the optical and surface properties of ZnO NRs, and remarkably increase the efficiency of UV emission.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-75784 (URN)10.1063/1.5110984 (DOI)000483883800025 ()2-s2.0-85070766229 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-08-30 (johcin)

Available from: 2019-08-30 Created: 2019-08-30 Last updated: 2019-10-08Bibliographically approved
Enrichi, F., Belmokhtar, S., Benedetti, A., Bouajaj, A., Cattaruzza, E., Coccetti, F., . . . Zur, L. Z. (2018). Ag nanoaggregates as efficient broadband sensitizers for Tb3+ ions in silica-zirconia ion-exchanged sol-gel glasses and glass-ceramics. Optical materials (Amsterdam), 84, 668-674
Open this publication in new window or tab >>Ag nanoaggregates as efficient broadband sensitizers for Tb3+ ions in silica-zirconia ion-exchanged sol-gel glasses and glass-ceramics
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2018 (English)In: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 84, p. 668-674Article in journal (Refereed) Published
Abstract [en]

In this paper we report the study of down-shifting silica-zirconia glass and glass-ceramic films doped by Tb3+ ions and Ag nanoaggregates, which combine the typical spectral properties of the rare-earth-ions with the broadband sensitizing effect of the metal nanostructures. Na-Tb co-doped silica-zirconia samples were obtained by a modified sol-gel route. Dip-coating deposition followed by annealing for solvent evaporation and matrix densification were repeated several times, obtaining a homogeneous crack-free film. A final treatment at 700 °C or 1000 °C was performed to control the nanoscale structural properties of the samples, resulting respectively in a glass (G) or a glass-ceramic (GC), where tetragonal zirconia nanocrystals are surrounded by an amorphous silica matrix. Ag introduction was then achieved by ion-exchange in a molten salt bath, followed by annealing in air to control the migration and aggregation of the metal ions. The comparison of the structural, compositional and optical properties are presented for G and GC samples, providing evidence of highly efficient photoluminescence enhancement in both systems, slightly better in G than in GC samples, with a remarkable increase of the green Tb3+ PL emission at 330 nm excitation: 12 times for G and 8 times for GC samples. Furthermore, after Ag-exchange, the shape of Tb3+ excitation resembles the one of Ag ions/nanoaggregates, with a broad significant absorption in the whole UV-blue spectral region. This broadband enhanced downshifting could find potential applications in lighting devices and in PV solar cells.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-70344 (URN)10.1016/j.optmat.2018.07.074 (DOI)000446145200099 ()2-s2.0-85050857389 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-08-13 (andbra)

Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2018-10-22Bibliographically approved
Enrichi, F., Cattaruzza, E., Ferrari, M., Gonella, F., Ottini, R., Riello, P., . . . Zur, L. (2018). Ag-Sensitized Yb3+ Emission in Glass-Ceramics. Micromachines, 9(8), Article ID 380.
Open this publication in new window or tab >>Ag-Sensitized Yb3+ Emission in Glass-Ceramics
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2018 (English)In: Micromachines, ISSN 2072-666X, E-ISSN 2072-666X, Vol. 9, no 8, article id 380Article in journal (Refereed) Published
Abstract [en]

Rare earth doped materials play a very important role in the development of many photonic devices, such as optical amplifiers and lasers, frequency converters, solar concentrators, up to quantum information storage devices. Among the rare earth ions, ytterbium is certainly one of the most frequently investigated and employed. The absorption and emission properties of Yb3+ ions are related to transitions between the two energy levels 2F7/2 (ground state) and 2F5/2 (excited state), involving photon energies around 1.26 eV (980 nm). Therefore, Yb3+ cannot directly absorb UV or visible light, and it is often used in combination with other rare earth ions like Pr3+, Tm3+, and Tb3+, which act as energy transfer centres. Nevertheless, even in those co-doped materials, the absorption bandwidth can be limited, and the cross section is small. In this paper, we report a broadband and efficient energy transfer process between Ag dimers/multimers and Yb3+ ions, which results in a strong PL emission around 980 nm under UV light excitation. Silica-zirconia (70% SiO2-30% ZrO2) glass-ceramic films doped by 4 mol.% Yb3+ ions and an additional 5 mol.% of Na2O were prepared by sol-gel synthesis followed by a thermal annealing at 1000 °C. Ag introduction was then obtained by ion-exchange in a molten salt bath and the samples were subsequently annealed in air at 430 °C to induce the migration and aggregation of the metal. The structural, compositional, and optical properties were investigated, providing evidence for efficient broadband sensitization of the rare earth ions by energy transfer from Ag dimers/multimers, which could have important applications in different fields, such as PV solar cells and light-emitting near-infrared (NIR) devices.

Place, publisher, year, edition, pages
MDPI, 2018
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-71115 (URN)10.3390/mi9080380 (DOI)000443256300014 ()2-s2.0-85054930887 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-10-05 (johcin)

Available from: 2018-10-05 Created: 2018-10-05 Last updated: 2019-03-27Bibliographically approved
Cailotto, S., Mazzaro, R., Enrichi, F., Vomiero, A., Selva, M., Cattaruzza, E., . . . Perosa, A. (2018). Design of Carbon Dots for Metal-free Photoredox Catalysis. ACS Applied Materials and Interfaces, 10(47), 40560-40567
Open this publication in new window or tab >>Design of Carbon Dots for Metal-free Photoredox Catalysis
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 47, p. 40560-40567Article in journal (Refereed) Published
Abstract [en]

The photoreduction potential of a set of four different carbon dots (CDs) was investigated. The CDs were synthesized by using two different preparation methods—hydrothermal and pyrolytic—and two sets of reagents—neat citric acid and citric acid doped with diethylenetriamine. The hydrothermal syntheses yielded amorphous CDs, which were either nondoped (a-CDs) or nitrogen-doped (a-N-CDs), whereas the pyrolytic treatment afforded graphitic CDs, either non-doped (g-CDs) or nitrogen-doped (g-N-CDs). The morphology, structure, and optical properties of four different types of CDs revealed significant differences depending on the synthetic pathway. The photocatalytic activities of the CDs were investigated as such, that is, in the absence of any other redox mediators, on the model photoreduction reaction of methyl viologen. The observed photocatalytic reaction rates: a-N-CDs ≥ g-CDs > a-CDs ≥ g-N-CDs were correlated with the presence/absence of fluorophores, to the graphitic core, and to quenching interactions between the two. The results indicate that nitrogen doping reverses the photoredox reactivity between amorphous and graphitic CDs and that amorphous N-doped CDs are the most photoredox active, a yet unknown fact that demonstrates the tunable potential of CDs for ad hoc applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
carbon dots, carbon nanomaterials, citric acid, methyl viologen, photocatalysis, photoreduction, photosensitizer, structure−reactivity relationship
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-71591 (URN)10.1021/acsami.8b14188 (DOI)000451932800021 ()30370767 (PubMedID)2-s2.0-85057216827 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-12-04 (inah)

Available from: 2018-11-15 Created: 2018-11-15 Last updated: 2019-03-27Bibliographically approved
Bortoluzzi, M., Castro, J., Enrichi, F., Vomiero, A., Busato, M. & Huang, W. (2018). Green-emitting manganese (II) complexes with phosphoramide and phenylphosphonic diamide ligands. Inorganic Chemistry Communications, 92, 145-150
Open this publication in new window or tab >>Green-emitting manganese (II) complexes with phosphoramide and phenylphosphonic diamide ligands
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2018 (English)In: Inorganic Chemistry Communications, ISSN 1387-7003, E-ISSN 1879-0259, Vol. 92, p. 145-150Article in journal (Refereed) Published
Abstract [en]

Tetrahedral manganese(II) complexes having formulae [MnX2{O = PR(NMe2)2}2] (X = Br, I; R = NMe2, Ph) were isolated and characterized, and in the case of [MnBr2{O = PPh(NMe2)2}2] the structure was ascertained by means of single crystal X-ray diffraction. All the complexes showed intense green emission assigned to the Mn(II) 4T1(4G) → 6A1(6S) transition upon excitation with UV light, with photoluminescence lifetimes in the range 100–1000 μs. Bromo-complexes maintain their luminescence features once dispersed in polycaprolactone matrix.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-68509 (URN)10.1016/j.inoche.2018.04.023 (DOI)000436883600030 ()2-s2.0-85046357935 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-05-15 (andbra)

Available from: 2018-04-25 Created: 2018-04-25 Last updated: 2018-08-10Bibliographically approved
Scrivanti, A., Bortoluzzi, M., Morandini, A., Dolmella, A., Enrichi, F., Mazzaro, R. & Vomiero, A. (2018). Luminescent europium(III) complexes containing an electron rich 1,2,3-triazolyl-pyridyl ligand. New Journal of Chemistry, 42(13), 11064-11072
Open this publication in new window or tab >>Luminescent europium(III) complexes containing an electron rich 1,2,3-triazolyl-pyridyl ligand
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2018 (English)In: New Journal of Chemistry, ISSN 1144-0546, E-ISSN 1369-9261, Vol. 42, no 13, p. 11064-11072Article in journal (Refereed) Published
Abstract [en]

An improved synthesis of the electron-rich N,N-chelating ligand, 2-(1-t-butyl-1H-1,2,3-triazol-4-yl)pyridine (L), has been developed by coupling t-butyl-azide with ethynylpyridine in the presence of a Cu(I) catalyst. L has been employed in the preparation of lanthanide coordination compounds having formulae [Ln(κ2-NO3)3L2] and [Eu(dbm)3L] (Ln = Eu, Tb; dbm = dibenzoylmethanate). The molecular structure of [Eu(dbm)3L] has been determined by X-ray diffraction studies. All the new complexes exhibit good photoluminescence properties and [Eu(dbm)3L] has been successfully used as the dopant for the preparation of luminescent plastic materials.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-69503 (URN)10.1039/C8NJ01390J (DOI)000436517300073 ()2-s2.0-85049158841 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-06-27 (svasva)

Available from: 2018-06-14 Created: 2018-06-14 Last updated: 2018-08-20Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-3443-3707

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