The Experts below are selected from a list of 25308 Experts worldwide ranked by ideXlab platform
Sergio Brovelli - One of the best experts on this subject based on the ideXlab platform.
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large area luminescent solar concentrators based on Stokes Shift engineered nanocrystals in a mass polymerized pmma matrix
Nature Photonics, 2014Co-Authors: Francesco Meinardi, Kirill A. Velizhanin, Monica Lorenzon, Vitalevich Ivan Klimov, Ranjani Viswanatha, Luca Beverina, Annalisa Colombo, Roberto Simonutti, Sergio BrovelliAbstract:Stokes-Shift-engineered CdSe/CdS quantum dots are used to fabricate luminescent solar concentrators that are tens of centimetres long and do not exhibit reabsorption losses. With efficiencies of over 10% and an effective concentration factor of 4.4, they demonstrate the potential of using Stokes-Shift-engineered quantum dots in large-area luminescent solar concentrators.
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Large-area luminescent solar concentrators based on ‘Stokes-Shift-engineered’ nanocrystals in a mass-polymerized PMMA matrix
Nature Photonics, 2014Co-Authors: Francesco Meinardi, Kirill A. Velizhanin, Monica Lorenzon, Vitalevich Ivan Klimov, Ranjani Viswanatha, Luca Beverina, Annalisa Colombo, Roberto Simonutti, Sergio BrovelliAbstract:Stokes-Shift-engineered CdSe/CdS quantum dots are used to fabricate luminescent solar concentrators that are tens of centimetres long and do not exhibit reabsorption losses. With efficiencies of over 10% and an effective concentration factor of 4.4, they demonstrate the potential of using Stokes-Shift-engineered quantum dots in large-area luminescent solar concentrators. Luminescent solar concentrators are cost-effective complements to semiconductor photovoltaics that can boost the output of solar cells and allow for the integration of photovoltaic-active architectural elements into buildings (for example, photovoltaic windows). Colloidal quantum dots are attractive for use in luminescent solar concentrators, but their small Stokes Shift results in reabsorption losses that hinder the realization of large-area devices. Here, we use ‘Stokes-Shift-engineered’ CdSe/CdS quantum dots with giant shells (giant quantum dots) to realize luminescent solar concentrators without reabsorption losses for device dimensions up to tens of centimetres. Monte-Carlo simulations show a 100-fold increase in efficiency using giant quantum dots compared with core-only nanocrystals. We demonstrate the feasibility of this approach by using high-optical-quality quantum dot–polymethylmethacrylate nanocomposites fabricated using a modified industrial method that preserves the light-emitting properties of giant quantum dots upon incorporation into the polymer. Study of these luminescent solar concentrators yields optical efficiencies >10% and an effective concentration factor of 4.4. These results demonstrate the significant promise of Stokes-Shift-engineered quantum dots for large-area luminescent solar concentrators.
Lijuan Xie - One of the best experts on this subject based on the ideXlab platform.
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fluorescent coumarin derivatives with large Stokes Shift dual emission and solid state luminescent properties an experimental and theoretical study
Dyes and Pigments, 2012Co-Authors: Yinghui Chen, Huimin Guo, Lijuan Xie, Jianzhang ZhaoAbstract:Abstract Coumarin derivatives containing 8-benzothiazole ( C-2 ) and its difluoroboron bound derivative ( C-3 ) were prepared. Both derivatives show dual emission at 322 nm and 513 nm and large Stokes Shift (188 nm), compared to the unsubstituted coumarin ( C-1 ), which shows emission at 356 nm with small Stokes Shift of 46 nm. C-2 and C-3 show fluorescence in solid state, in contrast the C-1 is non-fluorescent in the solid state. The excited state intramolecular proton transfer (ESIPT) process of C-2 was fully rationalized by DFT/TDDFT calculations with optimization of the ground state (S 0 ) and excited state (S 1 ) geometries. TDDFT calculations propose that the large Stokes Shift of C-2 and C-3 are due to the re-distribution of the frontier molecular orbitals at excited states. Study of the potential energy curve of C-2 indicated that the dual emission of the C-2 is due to the simultaneous S 1 and S 3 emission, not the rotamer of the enol form.
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Geometry relaxation-induced large Stokes Shift in red-emitting borondipyrromethenes (BODIPY) and applications in fluorescent thiol probes.
The Journal of organic chemistry, 2012Co-Authors: Yinghui Chen, Jianzhang Zhao, Huimin Guo, Lijuan XieAbstract:2-Thienyl and 2,6-bisthienyl BODIPY derivatives (BS-SS and BS-DS) were prepared that show intense absorption (e = 65000 M–1 cm–1 at 507 nm) and a large Stokes Shift (96 nm) vs the small Stokes Shift of typical BODIPY (
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geometry relaxation induced large Stokes Shift in red emitting borondipyrromethenes bodipy and applications in fluorescent thiol probes
Journal of Organic Chemistry, 2012Co-Authors: Yinghui Chen, Jianzhang Zhao, Huimin Guo, Lijuan XieAbstract:2-Thienyl and 2,6-bisthienyl BODIPY derivatives (BS-SS and BS-DS) were prepared that show intense absorption (e = 65000 M–1 cm–1 at 507 nm) and a large Stokes Shift (96 nm) vs the small Stokes Shift of typical BODIPY (<15 nm). Control compounds with a thienyl unit at the 8-position or phenyl substituents at the 2,6-positions were prepared (BS-1 and 9). BS-1 shows absorption/emission in the blue-Shifted range and a small Stokes Shift (12 nm). Compound 9 shows absorption in the red-Shifted range, but the Stokes Shift (<30 nm) is much smaller than that for BS-SS and BS-DS. DFT calculations propose the large Stokes Shifts of BS-SS and BS-DS are due to the remarkable geometry relaxation upon photoexcitation and its substantial effect on the energy levels of molecular orbitals. For the dyes with small Stokes Shifts, much smaller geometry relaxations were found. The fluorophores were used for fluorescent thiol probes, with 2,4-dinitrobenzenesulfonyl (DNBS) as the fluorescence switch. Both fluorescence OFF–ON and...
Francesco Meinardi - One of the best experts on this subject based on the ideXlab platform.
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large area luminescent solar concentrators based on Stokes Shift engineered nanocrystals in a mass polymerized pmma matrix
Nature Photonics, 2014Co-Authors: Francesco Meinardi, Kirill A. Velizhanin, Monica Lorenzon, Vitalevich Ivan Klimov, Ranjani Viswanatha, Luca Beverina, Annalisa Colombo, Roberto Simonutti, Sergio BrovelliAbstract:Stokes-Shift-engineered CdSe/CdS quantum dots are used to fabricate luminescent solar concentrators that are tens of centimetres long and do not exhibit reabsorption losses. With efficiencies of over 10% and an effective concentration factor of 4.4, they demonstrate the potential of using Stokes-Shift-engineered quantum dots in large-area luminescent solar concentrators.
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Large-area luminescent solar concentrators based on ‘Stokes-Shift-engineered’ nanocrystals in a mass-polymerized PMMA matrix
Nature Photonics, 2014Co-Authors: Francesco Meinardi, Kirill A. Velizhanin, Monica Lorenzon, Vitalevich Ivan Klimov, Ranjani Viswanatha, Luca Beverina, Annalisa Colombo, Roberto Simonutti, Sergio BrovelliAbstract:Stokes-Shift-engineered CdSe/CdS quantum dots are used to fabricate luminescent solar concentrators that are tens of centimetres long and do not exhibit reabsorption losses. With efficiencies of over 10% and an effective concentration factor of 4.4, they demonstrate the potential of using Stokes-Shift-engineered quantum dots in large-area luminescent solar concentrators. Luminescent solar concentrators are cost-effective complements to semiconductor photovoltaics that can boost the output of solar cells and allow for the integration of photovoltaic-active architectural elements into buildings (for example, photovoltaic windows). Colloidal quantum dots are attractive for use in luminescent solar concentrators, but their small Stokes Shift results in reabsorption losses that hinder the realization of large-area devices. Here, we use ‘Stokes-Shift-engineered’ CdSe/CdS quantum dots with giant shells (giant quantum dots) to realize luminescent solar concentrators without reabsorption losses for device dimensions up to tens of centimetres. Monte-Carlo simulations show a 100-fold increase in efficiency using giant quantum dots compared with core-only nanocrystals. We demonstrate the feasibility of this approach by using high-optical-quality quantum dot–polymethylmethacrylate nanocomposites fabricated using a modified industrial method that preserves the light-emitting properties of giant quantum dots upon incorporation into the polymer. Study of these luminescent solar concentrators yields optical efficiencies >10% and an effective concentration factor of 4.4. These results demonstrate the significant promise of Stokes-Shift-engineered quantum dots for large-area luminescent solar concentrators.
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high Stokes Shift perylene dyes for luminescent solar concentrators
Chemical Communications, 2013Co-Authors: Alessandro Sanguineti, Francesco Meinardi, Mauro Sassi, Riccardo Turrisi, G Vaccaro, Riccardo Ruffo, Luca BeverinaAbstract:Highly efficient plastic based single layer Luminescent Solar Concentrators (LSCs) require the design of luminophores having complete spectral separation between absorption and emission spectra (large Stokes Shift). We describe the design, synthesis and characterization of a new perylene dye possessing Stokes Shift as high as 300 meV, fluorescent quantum yield in the LSC slab of 70% and high chemical and photochemical stability.
Luca Beverina - One of the best experts on this subject based on the ideXlab platform.
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large area luminescent solar concentrators based on Stokes Shift engineered nanocrystals in a mass polymerized pmma matrix
Nature Photonics, 2014Co-Authors: Francesco Meinardi, Kirill A. Velizhanin, Monica Lorenzon, Vitalevich Ivan Klimov, Ranjani Viswanatha, Luca Beverina, Annalisa Colombo, Roberto Simonutti, Sergio BrovelliAbstract:Stokes-Shift-engineered CdSe/CdS quantum dots are used to fabricate luminescent solar concentrators that are tens of centimetres long and do not exhibit reabsorption losses. With efficiencies of over 10% and an effective concentration factor of 4.4, they demonstrate the potential of using Stokes-Shift-engineered quantum dots in large-area luminescent solar concentrators.
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Large-area luminescent solar concentrators based on ‘Stokes-Shift-engineered’ nanocrystals in a mass-polymerized PMMA matrix
Nature Photonics, 2014Co-Authors: Francesco Meinardi, Kirill A. Velizhanin, Monica Lorenzon, Vitalevich Ivan Klimov, Ranjani Viswanatha, Luca Beverina, Annalisa Colombo, Roberto Simonutti, Sergio BrovelliAbstract:Stokes-Shift-engineered CdSe/CdS quantum dots are used to fabricate luminescent solar concentrators that are tens of centimetres long and do not exhibit reabsorption losses. With efficiencies of over 10% and an effective concentration factor of 4.4, they demonstrate the potential of using Stokes-Shift-engineered quantum dots in large-area luminescent solar concentrators. Luminescent solar concentrators are cost-effective complements to semiconductor photovoltaics that can boost the output of solar cells and allow for the integration of photovoltaic-active architectural elements into buildings (for example, photovoltaic windows). Colloidal quantum dots are attractive for use in luminescent solar concentrators, but their small Stokes Shift results in reabsorption losses that hinder the realization of large-area devices. Here, we use ‘Stokes-Shift-engineered’ CdSe/CdS quantum dots with giant shells (giant quantum dots) to realize luminescent solar concentrators without reabsorption losses for device dimensions up to tens of centimetres. Monte-Carlo simulations show a 100-fold increase in efficiency using giant quantum dots compared with core-only nanocrystals. We demonstrate the feasibility of this approach by using high-optical-quality quantum dot–polymethylmethacrylate nanocomposites fabricated using a modified industrial method that preserves the light-emitting properties of giant quantum dots upon incorporation into the polymer. Study of these luminescent solar concentrators yields optical efficiencies >10% and an effective concentration factor of 4.4. These results demonstrate the significant promise of Stokes-Shift-engineered quantum dots for large-area luminescent solar concentrators.
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high Stokes Shift perylene dyes for luminescent solar concentrators
Chemical Communications, 2013Co-Authors: Alessandro Sanguineti, Francesco Meinardi, Mauro Sassi, Riccardo Turrisi, G Vaccaro, Riccardo Ruffo, Luca BeverinaAbstract:Highly efficient plastic based single layer Luminescent Solar Concentrators (LSCs) require the design of luminophores having complete spectral separation between absorption and emission spectra (large Stokes Shift). We describe the design, synthesis and characterization of a new perylene dye possessing Stokes Shift as high as 300 meV, fluorescent quantum yield in the LSC slab of 70% and high chemical and photochemical stability.
Yinghui Chen - One of the best experts on this subject based on the ideXlab platform.
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fluorescent coumarin derivatives with large Stokes Shift dual emission and solid state luminescent properties an experimental and theoretical study
Dyes and Pigments, 2012Co-Authors: Yinghui Chen, Huimin Guo, Lijuan Xie, Jianzhang ZhaoAbstract:Abstract Coumarin derivatives containing 8-benzothiazole ( C-2 ) and its difluoroboron bound derivative ( C-3 ) were prepared. Both derivatives show dual emission at 322 nm and 513 nm and large Stokes Shift (188 nm), compared to the unsubstituted coumarin ( C-1 ), which shows emission at 356 nm with small Stokes Shift of 46 nm. C-2 and C-3 show fluorescence in solid state, in contrast the C-1 is non-fluorescent in the solid state. The excited state intramolecular proton transfer (ESIPT) process of C-2 was fully rationalized by DFT/TDDFT calculations with optimization of the ground state (S 0 ) and excited state (S 1 ) geometries. TDDFT calculations propose that the large Stokes Shift of C-2 and C-3 are due to the re-distribution of the frontier molecular orbitals at excited states. Study of the potential energy curve of C-2 indicated that the dual emission of the C-2 is due to the simultaneous S 1 and S 3 emission, not the rotamer of the enol form.
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Geometry relaxation-induced large Stokes Shift in red-emitting borondipyrromethenes (BODIPY) and applications in fluorescent thiol probes.
The Journal of organic chemistry, 2012Co-Authors: Yinghui Chen, Jianzhang Zhao, Huimin Guo, Lijuan XieAbstract:2-Thienyl and 2,6-bisthienyl BODIPY derivatives (BS-SS and BS-DS) were prepared that show intense absorption (e = 65000 M–1 cm–1 at 507 nm) and a large Stokes Shift (96 nm) vs the small Stokes Shift of typical BODIPY (
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geometry relaxation induced large Stokes Shift in red emitting borondipyrromethenes bodipy and applications in fluorescent thiol probes
Journal of Organic Chemistry, 2012Co-Authors: Yinghui Chen, Jianzhang Zhao, Huimin Guo, Lijuan XieAbstract:2-Thienyl and 2,6-bisthienyl BODIPY derivatives (BS-SS and BS-DS) were prepared that show intense absorption (e = 65000 M–1 cm–1 at 507 nm) and a large Stokes Shift (96 nm) vs the small Stokes Shift of typical BODIPY (<15 nm). Control compounds with a thienyl unit at the 8-position or phenyl substituents at the 2,6-positions were prepared (BS-1 and 9). BS-1 shows absorption/emission in the blue-Shifted range and a small Stokes Shift (12 nm). Compound 9 shows absorption in the red-Shifted range, but the Stokes Shift (<30 nm) is much smaller than that for BS-SS and BS-DS. DFT calculations propose the large Stokes Shifts of BS-SS and BS-DS are due to the remarkable geometry relaxation upon photoexcitation and its substantial effect on the energy levels of molecular orbitals. For the dyes with small Stokes Shifts, much smaller geometry relaxations were found. The fluorophores were used for fluorescent thiol probes, with 2,4-dinitrobenzenesulfonyl (DNBS) as the fluorescence switch. Both fluorescence OFF–ON and...