Visible to NIR downconversion process in Tb3+-Yb3+ codoped silica-hafnia glass and glass-ceramic sol-gel waveguides for solar cells

Enrichi, Francesco; Armellini, Cristina; Belmokhtar, S.; Bouajaj, Adel; Chiappini, Andrea; Ferrari, Maurizio; Quandt, Alexander; Righini, Giancarlo C.; Vomiero, Alberto; Żur, Lidia

doi:10.1016/j.jlumin.2017.08.027

Cited by 55 publications

(17 citation statements)

References 34 publications

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“…% of the metal oxide content [13]. Therefore it can be expected, that 30ZrO 2 -70SiO 2 based materials will obtain GC materials with optical performances similar to previously demonstrated 30HfO 2 -70SiO 2 based glass ceramics [5,11].…”

Section: Introductionsupporting

confidence: 60%

“…Visible to near-infrared (NIR) down-conversion has been demonstrated for Tb and Yb doped nanocrystalline ZrO 2 [10]. Thus, devitrification of the glasses could lead to more luminescence efficient GC materials since emission QE of crystalline materials is typically higher, as has been successfully demonstrated for silica-hafnia glass ceramics [5,11] or Eu doped aluminosilicate glasses [12]. Metal-silicate systems, where the metal can be Zr, Hf, Y or La, deserve special attention here since these materials are particularly suitable for decomposition into a metal-and silica-rich phases in a quite broad range of SiO 2 content [13], which affects the crystallization behavior [14].…”

Section: Introductionmentioning

confidence: 97%

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Devitrification Behavior of Sol-Gel Derived ZrO2-SiO2 Rare-Earth Doped Glasses: Correlation between Structural and Optical Properties

et al. 2018

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Optical and structural properties of glasses and glass-ceramics (GC) obtained by different heat-treatment of Tb and Tb-Yb doped sol-gel derived 30ZrO2-70SiO2 materials were investigated. A glass was formed after treatment at 700 °C whereas devitrification of the media after the treatment at 1000 and 1100 °C, led to the formation of GC containing up to three different crystalline phases, namely, tetragonal ZrO2, Yb-disilicate and cristobalite. The modification of the optical properties through the heat treatment was caused by redistribution of the rare earth elements (REE) among the different phases: both Tb and Yb entered the t-ZrO2 lattice, Yb can also be present in the form of a Yb2Si2O7 crystal. Devitrification led to an increase in Tb→Yb energy transfer efficiency as compared to the glass, though it was higher in the samples heat-treated at 1000 °C than in those treated at 1100 °C. The most intensive Yb3+ luminescence, induced by the energy transfer from the Tb3+ ion, was observed at the interface between t-ZrO2 and the glassy phases, due to the high concentration of REE in this area caused by the inability of ZrO2 to accept larger amounts of the REE. The mechanisms of the Tb→Yb energy transfer vary between different phases of the GC. The results obtained in this study are important for the development of spectral down-converters for potential solar energy applications based on Tb-Yb co-doped glass-ceramics.

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Section: Introductionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 97%

Devitrification Behavior of Sol-Gel Derived ZrO2-SiO2 Rare-Earth Doped Glasses: Correlation between Structural and Optical Properties

et al. 2018

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“…However, the absorption and emission of Yb 3+ ions are due to transitions between only two levels: 2 F 7/2 (ground state) and 2 F 5/2 (excited state). Therefore, Yb 3+ ions are not able to directly absorb UV or visible photons, and other lanthanides are often added as codopants to provide an alternative excitation path by energy transfer, and sometimes to offer the additional possibility of photon multiplication by quantum cutting [15][16][17][18][19]. Nevertheless, codoping with other RE 3+ ions still do not solve the limited excitation and absorption bandwidths and their small excitation cross sections, which are major limitations for their implementation in thin film downconverting devices and other specific applications.…”

Section: Introductionmentioning

confidence: 99%

Ag-Sensitized NIR-Emitting Yb3+-Doped Glass-Ceramics

et al. 2020

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The optical photoluminescent (PL) emission of Yb3+ ions in the near infrared (NIR) spectral region at about 950–1100 nm has many potential applications, from photovoltaics to lasers and visual devices. However, due to their simple energy-level structure, Yb3+ ions cannot directly absorb UV or visible light, putting serious limits on their use as light emitters. In this paper we describe a broadband and efficient strategy for sensitizing Yb3+ ions by Ag codoping, resulting in a strong 980 nm PL emission under UV and violet-blue light excitation. Yb-doped silica–zirconia–soda glass–ceramic films were synthesized by sol-gel and dip-coating, followed by annealing at 1000 °C. Ag was then introduced by ion-exchange in a molten salt bath for 1 h at 350 °C. Different post-exchange annealing temperatures for 1 h in air at 380 °C and 430 °C were compared to investigate the possibility of migration/aggregation of the metal ions. Studies of composition showed about 1–2 wt% Ag in the exchanged samples, not modified by annealing. Structural analysis reported the stabilization of cubic zirconia by Yb-doping. Optical measurements showed that, in particular for the highest annealing temperature of 430 °C, the potential improvement of the material’s quality, which would increase the PL emission, is less relevant than Ag-aggregation, which decreases the sensitizers number, resulting in a net reduction of the PL intensity. However, all the Ag-exchanged samples showed a broadband Yb3+ sensitization by energy transfer from Ag aggregates, clearly attested by a broad photoluminescence excitation spectra after Ag-exchange, paving the way for applications in various fields, such as solar cells and NIR-emitting devices.

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“…In addition to Eu(III) and Tb(III) ions, those lanthanides that emit in the NIR spectrum section such as Yb(III), Nd(III) and Er(III) are more sensitive to deactivation by nonradiative processes as couplings with high-energy oscillators present in the solvent molecules or on the ligands. In order to enhance NIR light-emitting lanthanide luminescence, most of the examples described in the literature are based on Ln-orthophosphates [11,12], co-doped glass ceramics [13], or silica sol-gel glasses [14,15], where properties may be tuned by adjusting parameters as the concentration and/or the type of lanthanide, as well as the nature and size of the host crystals. An adequate design of the MOF architecture, targeting the geometry and the photophysical properties of the organic linker, should be advantageous in order to optimize the synthetic procedures and to control the crystal structures of new mixed-metal LnMOFs.Regarding the organic molecules acting as linkers, tris-N-heterocyclic ligands continue to be very widely used in complexation chemistry, because of their synthetic flexibility, strong metal binding capacity, and their ability to impart distinct photophysical, electrochemical, and magnetic properties.…”

mentioning

confidence: 99%

Crystal Structure Dependence of the Energy Transfer from Tb(III) to Yb(III) in Metal–Organic Frameworks Based in Bispyrazolylpyridines

2020

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Luminescent mixed lanthanide metal−organic framwork (MOF) materials have been prepared from two polyheterocyclic diacid ligands, 2,6-bis(3-carboxy-1-pyrazolyl)pyridine and 2,6-bis(4-carboxy-1-pyrazolyl)pyridine. The crystal structures of the two organic molecules are presented together with the structures for the MOFs obtained by hydrothermal synthesis either with Yb(III) or mixed Tb(III)/Yb(III) ions. Different coordination architectures result from each ligand, revealing also important differences between the lanthanides. The mixed lanthanide metal−organic frameworks also present diverse luminescent behavior; in the case of 2,6-bis(4-carboxy-1-pyrazolyl)pyridine, where no coordinated water is present in the metal environment, Tb(III) and Yb(III) characteristic emission is observed by excitation of the bispyrazolylpyridine chromophore.

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Visible to NIR downconversion process in Tb3+-Yb3+ codoped silica-hafnia glass and glass-ceramic sol-gel waveguides for solar cells

Cited by 55 publications

References 34 publications

Devitrification Behavior of Sol-Gel Derived ZrO2-SiO2 Rare-Earth Doped Glasses: Correlation between Structural and Optical Properties

Devitrification Behavior of Sol-Gel Derived ZrO2-SiO2 Rare-Earth Doped Glasses: Correlation between Structural and Optical Properties

Ag-Sensitized NIR-Emitting Yb3+-Doped Glass-Ceramics

Crystal Structure Dependence of the Energy Transfer from Tb(III) to Yb(III) in Metal–Organic Frameworks Based in Bispyrazolylpyridines

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