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Tersilla Virgili took her PhD in 2000 at the Physics Department of The University of Sheffield (UK). Since 2001 she is a permanent researcher of the Institute of Photonics and Nanotechnogies (IFN) in Milan (Italy). Her research is based on organic materials. She is an expert of ultrafast spectroscopy, organic microcavity (weak and strong coupling regime) and of organic devices. She is co-author of more than 90 international publications, 3 chapters of book and she is co-inventors of 2 international patents.
The presence of excited-states and charge-separated species was identified through UV and visible laser pump and visible/near-infrared probe femtosecond transient absorption spectroscopy in spin coated films of poly[N-9″-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) nanoparticles and mesoparticles. Optical gain in the mesoparticle films is observed after excitation at both 400 and 610 nm. In the mesoparticle film, charge generation after UV excitation appears after around 50 ps, but little is observed after visible pump excitation. In the nanoparticle film, as for a uniform film of the pure polymer, charge formation was efficiently induced by UV excitation pump, while excitation of the low energetic absorption states (at 610 nm) induces in the nanoparticle film a large optical gain region reducing the charge formation efficiency. It is proposed that the different intermolecular interactions and molecular order within the nanoparticles and mesoparticles are responsible for their markedly different photophysical behavior. These results therefore demonstrate the possibility of a hitherto unexplored route to stimulated emission in a conjugated polymer that has relatively undemanding film preparation requirements.
Mark Geoghegan; Marta Mróz; Chiara Botta; Laurie Parrenin; Cyril Brochon; Eric Cloutet; Eleni Pavlopoulou; Georges Hadziioannou; Tersilla Virgili. Optical Gain in Semiconducting Polymer Nano and Mesoparticles. Molecules 2021, 26, 1138 .
AMA StyleMark Geoghegan, Marta Mróz, Chiara Botta, Laurie Parrenin, Cyril Brochon, Eric Cloutet, Eleni Pavlopoulou, Georges Hadziioannou, Tersilla Virgili. Optical Gain in Semiconducting Polymer Nano and Mesoparticles. Molecules. 2021; 26 (4):1138.
Chicago/Turabian StyleMark Geoghegan; Marta Mróz; Chiara Botta; Laurie Parrenin; Cyril Brochon; Eric Cloutet; Eleni Pavlopoulou; Georges Hadziioannou; Tersilla Virgili. 2021. "Optical Gain in Semiconducting Polymer Nano and Mesoparticles." Molecules 26, no. 4: 1138.
The 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)-based molecules have emerged as interesting material for optoelectronic applications. The facile structural modification of BODIPY core provides an opportunity to fine-tune its photophysical and optoelectronic properties thanks to the presence of eight reactive sites which allows for the developing of a large number of functionalized derivatives for various applications. This review will focus on BODIPY application as solid-state active material in solar cells and in photonic devices. It has been divided into two sections dedicated to the two different applications. This review provides a concise and precise description of the experimental results, their interpretation as well as the conclusions that can be drawn. The main current research outcomes are summarized to guide the readers towards the full exploitation of the use of this material in optoelectronic applications.
Benedetta Maria Squeo; Lucia Ganzer; Tersilla Virgili; Mariacecilia Pasini. BODIPY-Based Molecules, A Platform for Photonic and Solar Cells. Molecules 2020, 26, 153 .
AMA StyleBenedetta Maria Squeo, Lucia Ganzer, Tersilla Virgili, Mariacecilia Pasini. BODIPY-Based Molecules, A Platform for Photonic and Solar Cells. Molecules. 2020; 26 (1):153.
Chicago/Turabian StyleBenedetta Maria Squeo; Lucia Ganzer; Tersilla Virgili; Mariacecilia Pasini. 2020. "BODIPY-Based Molecules, A Platform for Photonic and Solar Cells." Molecules 26, no. 1: 153.
Using ultrafast spectroscopy, we investigate the photophysics of water-processable nanoparticles composed of a block copolymer electron donor and a fullerene derivative electron acceptor.
Lucia Ganzer; Stefania Zappia; Mattia Russo; Anna Maria Ferretti; Varun Vohra; Marianna Diterlizzi; Maria Rosa Antognazza; Silvia Destri; Tersilla Virgili. Ultrafast spectroscopy on water-processable PCBM: rod–coil block copolymer nanoparticles. Physical Chemistry Chemical Physics 2020, 22, 26583 -26591.
AMA StyleLucia Ganzer, Stefania Zappia, Mattia Russo, Anna Maria Ferretti, Varun Vohra, Marianna Diterlizzi, Maria Rosa Antognazza, Silvia Destri, Tersilla Virgili. Ultrafast spectroscopy on water-processable PCBM: rod–coil block copolymer nanoparticles. Physical Chemistry Chemical Physics. 2020; 22 (45):26583-26591.
Chicago/Turabian StyleLucia Ganzer; Stefania Zappia; Mattia Russo; Anna Maria Ferretti; Varun Vohra; Marianna Diterlizzi; Maria Rosa Antognazza; Silvia Destri; Tersilla Virgili. 2020. "Ultrafast spectroscopy on water-processable PCBM: rod–coil block copolymer nanoparticles." Physical Chemistry Chemical Physics 22, no. 45: 26583-26591.
TT-Py exhibits anti-Kasha and multiple emissive behaviour due to the copresence of rigid TT and partially conformationally free Py.
Elena Lucenti; Alessandra Forni; Andrea Previtali; Daniele Marinotto; Daniele Malpicci; Stefania Righetto; Clelia Giannini; Tersilla Virgili; Piotr Kabacinski; Lucia Ganzer; Umberto Giovanella; Chiara Botta; Elena Cariati. Unravelling the intricate photophysical behavior of 3-(pyridin-2-yl)triimidazotriazine AIE and RTP polymorphs. Chemical Science 2020, 11, 7599 -7608.
AMA StyleElena Lucenti, Alessandra Forni, Andrea Previtali, Daniele Marinotto, Daniele Malpicci, Stefania Righetto, Clelia Giannini, Tersilla Virgili, Piotr Kabacinski, Lucia Ganzer, Umberto Giovanella, Chiara Botta, Elena Cariati. Unravelling the intricate photophysical behavior of 3-(pyridin-2-yl)triimidazotriazine AIE and RTP polymorphs. Chemical Science. 2020; 11 (29):7599-7608.
Chicago/Turabian StyleElena Lucenti; Alessandra Forni; Andrea Previtali; Daniele Marinotto; Daniele Malpicci; Stefania Righetto; Clelia Giannini; Tersilla Virgili; Piotr Kabacinski; Lucia Ganzer; Umberto Giovanella; Chiara Botta; Elena Cariati. 2020. "Unravelling the intricate photophysical behavior of 3-(pyridin-2-yl)triimidazotriazine AIE and RTP polymorphs." Chemical Science 11, no. 29: 7599-7608.
By ultrafast spectroscopy we provide experimental evidence of superextensive charging in organic quantum batteries constructed as microcavities based on a double dielectric-mirror structure containing a thin film of a Lumogen-F dye blended in a polystyrene matrix.
J. Q. Quach; T. Virgili; G. Cerullo; K. E. McGhee; L. Ganzer; D. G. Lidzey. Organic quantum batteries. The 22nd International Conference on Ultrafast Phenomena 2020 2020, Tu4A.1 .
AMA StyleJ. Q. Quach, T. Virgili, G. Cerullo, K. E. McGhee, L. Ganzer, D. G. Lidzey. Organic quantum batteries. The 22nd International Conference on Ultrafast Phenomena 2020. 2020; ():Tu4A.1.
Chicago/Turabian StyleJ. Q. Quach; T. Virgili; G. Cerullo; K. E. McGhee; L. Ganzer; D. G. Lidzey. 2020. "Organic quantum batteries." The 22nd International Conference on Ultrafast Phenomena 2020 , no. : Tu4A.1.
The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer functionalized by four triphenylamine (TPA) groups. By ultrafast spectroscopy we found a large gain spectral region from 420 to 500 nm with a maximum gain cross-section of 1.5 × 10-16 cm2 which makes this molecule a good candidate for photonic applications. Amplified Spontaneous Emission measurements (ASE) under 150 fs and 3 ns pump pulses have revealed a narrow emission at 450 nm with a threshold of 5.5 μJcm-2 and 21 μJcm-2 respectively. Our results evidence that this new fluorene molecule is an interesting material for photonic applications, indeed the inclusion of TPA as a lateral substituent leads to a high gain and consequently to a low threshold blue organic ASE.
Tersilla Virgili; Marco Anni; Maria Luisa De Giorgi; Rocio Borrego Varillas; Benedetta M. Squeo; Mariacecilia Pasini. Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film. Molecules 2019, 25, 79 .
AMA StyleTersilla Virgili, Marco Anni, Maria Luisa De Giorgi, Rocio Borrego Varillas, Benedetta M. Squeo, Mariacecilia Pasini. Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film. Molecules. 2019; 25 (1):79.
Chicago/Turabian StyleTersilla Virgili; Marco Anni; Maria Luisa De Giorgi; Rocio Borrego Varillas; Benedetta M. Squeo; Mariacecilia Pasini. 2019. "Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film." Molecules 25, no. 1: 79.
Multilayers of sulphur-based anchoring group linkers and CdSe nanocrystals (NCs) were realized on ITO substrate via layer-by-layer alternation. The materials were investigated by UV-vis and FTIR spectroscopy, photoluminescence and photoconductivity. We found that the change of NCs packing during the multilayers build-up produces a progressive increase of exciton delocalization. In fact during multilayer deposition the NCs first excitonic peak shifts progressively towards longer wavelengths. We found a linear relation between the optical bang gap shift ("" E_gn) and the inverse of number of CdSe-NCs layers ( n ) for n > 2, in particular the decrease of its value for the infinite multilayer from the one of the solution (2.10 eV) goes from 18 meV for the 1,2-ethylene-bis(dithiocarbamate) (EDTC) linker to 66 meV for sulphide dianions, corresponding to an apparent increase of the exciton radius of 0.20 nm and 0.85nm respectively.
Barbara Vercelli; Tersilla Virgili; Mariacecilia Pasini; Anna Berlin; Gianni Zotti. Multilayers of Carbodithioate and Sulfide-Linked CdSe Nanocrystals: Progressive Increase of Exciton Delocalization. The Journal of Physical Chemistry C 2019, 123, 23159 -23166.
AMA StyleBarbara Vercelli, Tersilla Virgili, Mariacecilia Pasini, Anna Berlin, Gianni Zotti. Multilayers of Carbodithioate and Sulfide-Linked CdSe Nanocrystals: Progressive Increase of Exciton Delocalization. The Journal of Physical Chemistry C. 2019; 123 (37):23159-23166.
Chicago/Turabian StyleBarbara Vercelli; Tersilla Virgili; Mariacecilia Pasini; Anna Berlin; Gianni Zotti. 2019. "Multilayers of Carbodithioate and Sulfide-Linked CdSe Nanocrystals: Progressive Increase of Exciton Delocalization." The Journal of Physical Chemistry C 123, no. 37: 23159-23166.
The photophysics of water and propan-1-ol suspensions of poly [N-9”-heptadecanyl-2,7-carbazole-alt−5,5-(4,7-di-2-thienyl-2′,1′,3′- benzothiadiazole)] (PCDTBT) nanoparticles and mesoparticles has been studied by ultrafast spectroscopy. High molar mass polymer (HMM > 20 kg/mol) forms nanoparticles with around 50 nm diameter via mini-emulsion post-polymerization, while low molar mass (LMM < 5 kg/mol) polymer prepared by dispersion polymerization results in particles with a diameter of almost one order of magnitude larger (450 ± 50 nm). In this study, the presence of excited-states and charge separated species was identified through UV pump and visible/near-infrared probe femtosecond transient absorption spectroscopy. A different behavior for the HMM nanoparticles has been identified compared to the LMM mesoparticles. The nanoparticles exhibit typical features of an energetically disordered conjugated polymer with a broad density of states, allowing for delayed spectral relaxation of excited states, while the mesoparticles show a J-aggregate-like behavior where interchain interactions are less efficient. Stimulated emission in the red-near infrared region has been found in the mesoparticles which indicates that they present a more energetically ordered system.
Tersilla Virgili; Chiara Botta; Marta M. Mróz; Laurie Parrenin; Cyril Brochon; Eric Cloutet; Eleni Pavlopoulou; Georges Hadziioannou; Mark Geoghegan. Size-Dependent Photophysical Behavior of Low Bandgap Semiconducting Polymer Particles. Frontiers in Chemistry 2019, 7, 409 .
AMA StyleTersilla Virgili, Chiara Botta, Marta M. Mróz, Laurie Parrenin, Cyril Brochon, Eric Cloutet, Eleni Pavlopoulou, Georges Hadziioannou, Mark Geoghegan. Size-Dependent Photophysical Behavior of Low Bandgap Semiconducting Polymer Particles. Frontiers in Chemistry. 2019; 7 ():409.
Chicago/Turabian StyleTersilla Virgili; Chiara Botta; Marta M. Mróz; Laurie Parrenin; Cyril Brochon; Eric Cloutet; Eleni Pavlopoulou; Georges Hadziioannou; Mark Geoghegan. 2019. "Size-Dependent Photophysical Behavior of Low Bandgap Semiconducting Polymer Particles." Frontiers in Chemistry 7, no. : 409.
Polythiophenes are the most widely utilized semiconducting polymers in organic electronics, but they are scarcely exploited in photonics due to their high photo-induced absorption caused by interchain polaron pairs, which prevents the establishment of a window of net optical gain. Here we study the photophysics of poly(3-hexylthiophene) configured with different degrees of supramolecular ordering, spin-coated thin films and templated nanowires, and find marked differences in their optical properties. Transient absorption measurements evidence a partially-polarized stimulated emission band in the nanowire samples, in contrast with the photo-induced absorption band observed in spin-coated thin films. In combination with theoretical modeling, our experimental results reveal the origin of the primary photoexcitations dominating the dynamics for different supramolecular ordering, with singlet excitons in the nanostructured samples superseding the presence of polaron pairs, which are present in the disordered films. Our approach demonstrates a viable strategy to direct optical properties through structural control, and the observation of optical gain opens the possibility to the use of polythiophene nanostructures as building blocks of organic optical amplifiers and active photonic devices.
Alberto Portone; Lucia Ganzer; Federico Branchi; Rodrigo Ramos; Marília J. Caldas; Dario Pisignano; Elisa Molinari; Giulio Cerullo; Luana Persano; Deborah Prezzi; Tersilla Virgili. Tailoring optical properties and stimulated emission in nanostructured polythiophene. Scientific Reports 2019, 9, 7370 .
AMA StyleAlberto Portone, Lucia Ganzer, Federico Branchi, Rodrigo Ramos, Marília J. Caldas, Dario Pisignano, Elisa Molinari, Giulio Cerullo, Luana Persano, Deborah Prezzi, Tersilla Virgili. Tailoring optical properties and stimulated emission in nanostructured polythiophene. Scientific Reports. 2019; 9 (1):7370.
Chicago/Turabian StyleAlberto Portone; Lucia Ganzer; Federico Branchi; Rodrigo Ramos; Marília J. Caldas; Dario Pisignano; Elisa Molinari; Giulio Cerullo; Luana Persano; Deborah Prezzi; Tersilla Virgili. 2019. "Tailoring optical properties and stimulated emission in nanostructured polythiophene." Scientific Reports 9, no. 1: 7370.
Interchain interactions can play a positive role in reaching amplified spontaneous emission in an interesting core–polymer system where the donor (side chains) and the acceptor (core) are chemically linked together. Different degree of interchain interactions modifies the photophysical characteristics of the polymer. By means of transient absorption spectroscopy we show that the stimulated emission from the core decreases passing from solid state to concentrated solution and it is almost absent in the diluted solution. The conformational rearrangements of the core–polymer chain in solution limits the efficiency of the intrachain Förster energy transfer mechanism. The free chain rotations decrease the exciton hopping along the conjugated chains, the ratio between donor and acceptor moieties in the polymer, and change the relative orientation of the transition dipoles of the donor and acceptor causing a strong decrease of energy transfer efficiency and subsequently of the gain. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 965–969
Serena Bolis; Mariacecilia Pasini; Tersilla Virgili. Ultrafast study of inter- and intrachain energy transfer in a core-polymer. Journal of Polymer Science Part B: Polymer Physics 2018, 56, 965 -969.
AMA StyleSerena Bolis, Mariacecilia Pasini, Tersilla Virgili. Ultrafast study of inter- and intrachain energy transfer in a core-polymer. Journal of Polymer Science Part B: Polymer Physics. 2018; 56 (13):965-969.
Chicago/Turabian StyleSerena Bolis; Mariacecilia Pasini; Tersilla Virgili. 2018. "Ultrafast study of inter- and intrachain energy transfer in a core-polymer." Journal of Polymer Science Part B: Polymer Physics 56, no. 13: 965-969.
David G. Lidzey, Pavlos G. Lagoudakis, and co‐workers demonstrate room temperature polariton condensation in the yellow part of the visible spectrum from a planar organic semiconductor microcavity containing the molecular dye BODIPY‐Br in article number 1700203. Single‐shot polariton dispersion imaging is exploited to observe the collapse of the energy distribution and a blueshift of the emission wavelength upon reaching condensation threshold.
Tamsin Cookson; Kyriacos Georgiou; Anton Zasedatelev; Richard T. Grant; Tersilla Virgili; Marco Cavazzini; Francesco Galeotti; Caspar Clark; Natalia G. Berloff; David G. Lidzey; Pavlos G. Lagoudakis. Polariton Condensates: A Yellow Polariton Condensate in a Dye Filled Microcavity (Advanced Optical Materials 18/2017). Advanced Optical Materials 2017, 5, 1 .
AMA StyleTamsin Cookson, Kyriacos Georgiou, Anton Zasedatelev, Richard T. Grant, Tersilla Virgili, Marco Cavazzini, Francesco Galeotti, Caspar Clark, Natalia G. Berloff, David G. Lidzey, Pavlos G. Lagoudakis. Polariton Condensates: A Yellow Polariton Condensate in a Dye Filled Microcavity (Advanced Optical Materials 18/2017). Advanced Optical Materials. 2017; 5 (18):1.
Chicago/Turabian StyleTamsin Cookson; Kyriacos Georgiou; Anton Zasedatelev; Richard T. Grant; Tersilla Virgili; Marco Cavazzini; Francesco Galeotti; Caspar Clark; Natalia G. Berloff; David G. Lidzey; Pavlos G. Lagoudakis. 2017. "Polariton Condensates: A Yellow Polariton Condensate in a Dye Filled Microcavity (Advanced Optical Materials 18/2017)." Advanced Optical Materials 5, no. 18: 1.
Formation of densely packed thin films of semiconductor nanocrystals is advantageous for the exploitation of their unique optoelectronic properties for real-world applications. Here we investigate the fundamental role of the structure of the bridging ligand on the optoelectronic properties of the resulting hybrid film. In particular, we considered hybrid films formed using the same CdSe nanocrystals and two organic ligands that have the same bidentate dithiocarbamate binding moiety, but differ in their bridging structures, one bridged by ethylene, the other by phenylene that exhibits conjugation. Based on the results of photo-excited carrier dynamics experiments combined with theoretical calculations on the electronic states of bridged CdSe layers, we show that only the phenylene-based ligand presents a strong hybridization of the molecular HOMO state with CdSe layers, that is a marker of formation of an effective bridge. We argue that this hybridization spread favors the hopping of photo-excited carriers between nanocrystals, which may explain the reported larger photo-currents in phenylene-based hybrid films than those observed in ethylene-based ones.
Tersilla Virgili; Arrigo Calzolari; Inma Suárez López; Alice Ruini; Alessandra Catellani; Barbara Vercelli; Francesco Tassone. Hybridized electronic states between CdSe nanoparticles and conjugated organic ligands: A theoretical and ultrafast photo-excited carrier dynamics study. Nano Research 2017, 11, 142 -150.
AMA StyleTersilla Virgili, Arrigo Calzolari, Inma Suárez López, Alice Ruini, Alessandra Catellani, Barbara Vercelli, Francesco Tassone. Hybridized electronic states between CdSe nanoparticles and conjugated organic ligands: A theoretical and ultrafast photo-excited carrier dynamics study. Nano Research. 2017; 11 (1):142-150.
Chicago/Turabian StyleTersilla Virgili; Arrigo Calzolari; Inma Suárez López; Alice Ruini; Alessandra Catellani; Barbara Vercelli; Francesco Tassone. 2017. "Hybridized electronic states between CdSe nanoparticles and conjugated organic ligands: A theoretical and ultrafast photo-excited carrier dynamics study." Nano Research 11, no. 1: 142-150.
Polariton condensation in the yellow part of the visible spectrum from a planar organic semiconductor microcavity containing the molecular dye bromine‐substituted boron‐dipyrromethene is observed. This study provides experimental fingerprint of polariton condensation under nonresonant optical excitation, including the nonlinear dependence of the emission intensity and wavelength blueshift with increasing excitation density, single excitation pulse dispersion imaging, and real space interferometry. The latter two allow to visualize the collapse of the energy distribution and the long‐range coherence of the polariton condensate.
Tamsin Cookson; Kyriacos Georgiou; Anton Zasedatelev; Richard T. Grant; Tersilla Virgili; Marco Cavazzini; Francesco Galeotti; Caspar Clark; Natalia G. Berloff; David G. Lidzey; Pavlos G. Lagoudakis. A Yellow Polariton Condensate in a Dye Filled Microcavity. Advanced Optical Materials 2017, 5, 1 .
AMA StyleTamsin Cookson, Kyriacos Georgiou, Anton Zasedatelev, Richard T. Grant, Tersilla Virgili, Marco Cavazzini, Francesco Galeotti, Caspar Clark, Natalia G. Berloff, David G. Lidzey, Pavlos G. Lagoudakis. A Yellow Polariton Condensate in a Dye Filled Microcavity. Advanced Optical Materials. 2017; 5 (18):1.
Chicago/Turabian StyleTamsin Cookson; Kyriacos Georgiou; Anton Zasedatelev; Richard T. Grant; Tersilla Virgili; Marco Cavazzini; Francesco Galeotti; Caspar Clark; Natalia G. Berloff; David G. Lidzey; Pavlos G. Lagoudakis. 2017. "A Yellow Polariton Condensate in a Dye Filled Microcavity." Advanced Optical Materials 5, no. 18: 1.
Photocatalytic reactions could enhance the share of chemicals produced through renewable sources. The efficiency of photocatalysts drastically depends on light absorption, on the surface energy of the crystals, and on the properties of the nanobuilding blocks assembled in devices. Here, we show that photoelectrochemical water oxidation on brookite TiO2 nanorods is greatly enhanced by engineering the location of Au nanoparticles deposition. Brookite photoanodes show a very low onset potential for water oxidation to H2O2 of −0.2 VRHE due to energetics of exposed crystal facets. By combining electrochemical measurements and ultrafast optical spectroscopy, we link the water oxidation activity with electron–hole recombination phenomena. The preferential Au decoration at the electrode/water interface produces highly enhanced photocurrent, while when Au is distributed along the whole film thickness, the activity is depressed with respect to pure brookite. In the latter case, Au nanoparticles act as recombination centers with plasmonic carriers recombining on the same time scale of their generation (fs). Conversely, Au surface decoration enables a hot electrons lifetime 4 orders of magnitude longer (ns) due to efficient hopping on brookite lateral facets, thus providing an efficient path for plasmon-enhanced solar water oxidation.
Alberto Naldoni; Tiziano Montini; Francesco Malara; Marta M. Mróz; Alessandro Beltram; Tersilla Virgili; Chiara L. Boldrini; Marcello Marelli; Ismael Romero; Juan José Delgado; Vladimiro Dal Santo; Paolo Fornasiero. Hot Electron Collection on Brookite Nanorods Lateral Facets for Plasmon-Enhanced Water Oxidation. ACS Catalysis 2017, 7, 1270 -1278.
AMA StyleAlberto Naldoni, Tiziano Montini, Francesco Malara, Marta M. Mróz, Alessandro Beltram, Tersilla Virgili, Chiara L. Boldrini, Marcello Marelli, Ismael Romero, Juan José Delgado, Vladimiro Dal Santo, Paolo Fornasiero. Hot Electron Collection on Brookite Nanorods Lateral Facets for Plasmon-Enhanced Water Oxidation. ACS Catalysis. 2017; 7 (2):1270-1278.
Chicago/Turabian StyleAlberto Naldoni; Tiziano Montini; Francesco Malara; Marta M. Mróz; Alessandro Beltram; Tersilla Virgili; Chiara L. Boldrini; Marcello Marelli; Ismael Romero; Juan José Delgado; Vladimiro Dal Santo; Paolo Fornasiero. 2017. "Hot Electron Collection on Brookite Nanorods Lateral Facets for Plasmon-Enhanced Water Oxidation." ACS Catalysis 7, no. 2: 1270-1278.
One-dimensional J aggregates present narrow and intense absorption and emission spectra that are interesting for photonics applications. Matrix immobilization of the aggregates, as required for most device architectures, has recently been shown to induce a non-Gaussian (Lévy type) defect distribution with heavy tails, expected to influence exciton relaxation. Here we perform two-dimensional electronic spectroscopy (2DES) in one-dimensional J aggregates of the cyanine dye TDBC, immobilized in a gel matrix, and we quantitatively model 2DES maps by nonlinear optimization coupled to quantum mechanical calculations of the transient excitonic response. We find that immobilization causes strong non-Gaussian off-diagonal disorder, leading to a segmentation of the chains. Intersegmental exciton transfer is found to proceed on the picosecond time scale, causing a long-lasting excitation memory. These findings can be used to inform the design of optoelectronic devices based on J aggregates as they allow for control of exciton properties by disorder management.
Larry Lüer; Sai Kiran Rajendran; Tatjana Stoll; Lucia Ganzer; Julien Rehault; David M. Coles; David Lidzey; Tersilla Virgili; Giulio Cerullo. Lévy Defects in Matrix-Immobilized J Aggregates: Tracing Intra-and Intersegmental Exciton Relaxation. The Journal of Physical Chemistry Letters 2017, 8, 547 -552.
AMA StyleLarry Lüer, Sai Kiran Rajendran, Tatjana Stoll, Lucia Ganzer, Julien Rehault, David M. Coles, David Lidzey, Tersilla Virgili, Giulio Cerullo. Lévy Defects in Matrix-Immobilized J Aggregates: Tracing Intra-and Intersegmental Exciton Relaxation. The Journal of Physical Chemistry Letters. 2017; 8 (3):547-552.
Chicago/Turabian StyleLarry Lüer; Sai Kiran Rajendran; Tatjana Stoll; Lucia Ganzer; Julien Rehault; David M. Coles; David Lidzey; Tersilla Virgili; Giulio Cerullo. 2017. "Lévy Defects in Matrix-Immobilized J Aggregates: Tracing Intra-and Intersegmental Exciton Relaxation." The Journal of Physical Chemistry Letters 8, no. 3: 547-552.
On page 1615, D. G. Lidzey and co-workers explore changes in polariton population distribution in strongly coupled microcavities containing a fluorescent molecular dye. Radiative pumping of polariton states from weakly coupled species within the cavity is identified as the dominant population mechanism. A phenomenological fitting model is developed to describe polariton populations on the lower polariton branch as a function of exciton–photon detuning and cavity temperature.
Richard T. Grant; Paolo Michetti; Andrew J. Musser; Pascal Gregoire; Tersilla Virgili; Eleonora Vella; Marco Cavazzini; Kyriacos Georgiou; Francesco Galeotti; Caspar Clark; Jenny Clark; Carlos Silva; David G. Lidzey. Polaritons: Efficient Radiative Pumping of Polaritons in a Strongly Coupled Microcavity by a Fluorescent Molecular Dye (Advanced Optical Materials 10/2016). Advanced Optical Materials 2016, 4, 1614 -1614.
AMA StyleRichard T. Grant, Paolo Michetti, Andrew J. Musser, Pascal Gregoire, Tersilla Virgili, Eleonora Vella, Marco Cavazzini, Kyriacos Georgiou, Francesco Galeotti, Caspar Clark, Jenny Clark, Carlos Silva, David G. Lidzey. Polaritons: Efficient Radiative Pumping of Polaritons in a Strongly Coupled Microcavity by a Fluorescent Molecular Dye (Advanced Optical Materials 10/2016). Advanced Optical Materials. 2016; 4 (10):1614-1614.
Chicago/Turabian StyleRichard T. Grant; Paolo Michetti; Andrew J. Musser; Pascal Gregoire; Tersilla Virgili; Eleonora Vella; Marco Cavazzini; Kyriacos Georgiou; Francesco Galeotti; Caspar Clark; Jenny Clark; Carlos Silva; David G. Lidzey. 2016. "Polaritons: Efficient Radiative Pumping of Polaritons in a Strongly Coupled Microcavity by a Fluorescent Molecular Dye (Advanced Optical Materials 10/2016)." Advanced Optical Materials 4, no. 10: 1614-1614.
The optical properties of a series of strongly coupled microcavities containing the fluorescent molecular dye BODIPY‐Br (bromine‐substituted boron‐dipyrromethene) dispersed into a transparent dielectric matrix are explored, with each cavity having a different exciton–photon detuning. Using temperature dependent emission, time‐resolved spectroscopy, white‐light reflectivity, and measurements of fluorescence quantum yield, the population of polaritons is explored along the lower polariton branch. It is found that both the cavity fluorescence quantum efficiency and the distribution of polariton states along the lower polariton branch is a function of exciton–photon detuning. Importantly, it is shown that in the most negatively detuned cavities, the emission quantum efficiency approaches that of a control (noncavity) film. A simple fitting model is developed, which is based upon direct radiative pumping of polariton states along the lower polariton branch and used it to obtain an excellent agreement with measured photoluminescence as a function of temperature and exciton–photon detuning, and qualitative agreement with the measured photoluminescence quantum efficiency. The radiative pumping mechanism indicates that to facilitate the formation of a nonequilibrium polariton condensate in strongly‐coupled microcavities containing dispersed molecular dyes, it is important to utilize materials having high fluorescent quantum efficiency and fast radiative rates.
Richard T. Grant; Paolo Michetti; Andrew Musser; Pascal Gregoire; Tersilla Virgili; Eleonora Vella; Marco Cavazzini; Kyriacos Georgiou; Francesco Galeotti; Caspar Clark; Jenny Clark; Carlos Silva; David G. Lidzey. Efficient Radiative Pumping of Polaritons in a Strongly Coupled Microcavity by a Fluorescent Molecular Dye. Advanced Optical Materials 2016, 4, 1615 -1623.
AMA StyleRichard T. Grant, Paolo Michetti, Andrew Musser, Pascal Gregoire, Tersilla Virgili, Eleonora Vella, Marco Cavazzini, Kyriacos Georgiou, Francesco Galeotti, Caspar Clark, Jenny Clark, Carlos Silva, David G. Lidzey. Efficient Radiative Pumping of Polaritons in a Strongly Coupled Microcavity by a Fluorescent Molecular Dye. Advanced Optical Materials. 2016; 4 (10):1615-1623.
Chicago/Turabian StyleRichard T. Grant; Paolo Michetti; Andrew Musser; Pascal Gregoire; Tersilla Virgili; Eleonora Vella; Marco Cavazzini; Kyriacos Georgiou; Francesco Galeotti; Caspar Clark; Jenny Clark; Carlos Silva; David G. Lidzey. 2016. "Efficient Radiative Pumping of Polaritons in a Strongly Coupled Microcavity by a Fluorescent Molecular Dye." Advanced Optical Materials 4, no. 10: 1615-1623.
We report the design, synthesis, molecular optical properties, and solid state emissive behaviour of a series of novel compounds, which, similar to the archetypal AIE luminogen tetraphenylethene, are formed of a central olefin stator and decorated with either three or four rotors. These rotors, being either electron-rich substituted benzenes, or electron-withdrawing functional groups (esters, ketones, cyano groups) confer a “push–pull” character to the overall molecular structure. Building on both new and already published contributions, a comprehensive picture of the properties and the potential of these compounds is provided.
Andrea Nitti; Francesca Villafiorita-Monteleone; Aurora Pacini; Chiara Botta; Tersilla Virgili; Alessandra Forni; Elena Cariati; Massimo Boiocchi; Dario Pasini. Structure–activity relationship for the solid state emission of a new family of “push–pull” π-extended chromophores. Faraday Discussions 2016, 196, 143 -161.
AMA StyleAndrea Nitti, Francesca Villafiorita-Monteleone, Aurora Pacini, Chiara Botta, Tersilla Virgili, Alessandra Forni, Elena Cariati, Massimo Boiocchi, Dario Pasini. Structure–activity relationship for the solid state emission of a new family of “push–pull” π-extended chromophores. Faraday Discussions. 2016; 196 ():143-161.
Chicago/Turabian StyleAndrea Nitti; Francesca Villafiorita-Monteleone; Aurora Pacini; Chiara Botta; Tersilla Virgili; Alessandra Forni; Elena Cariati; Massimo Boiocchi; Dario Pasini. 2016. "Structure–activity relationship for the solid state emission of a new family of “push–pull” π-extended chromophores." Faraday Discussions 196, no. : 143-161.
A full exploitation of the unique features of graphene and related 2D materials in micro and nano-scaled optoelectronic devices for high-data rate photonic systems calls for a deep understanding of their fundamental structural, electronic, photophysical properties and fast dynamics. We introduce some advanced spectroscopic techniques developed to this aim, while reviewing their specific potentialities and highlighting recent results. To provide absolute local nanoscale thickness metrology of as-grown 2D materials, Scanning Auger Electron Microspectroscopy has been calibrated. Results obtained for graphene and graphene oxide (GO) are reported, showing sub-monolayer resolution. Ultrafast optical transient absorption spectroscopy, with temporal resolution down to 10fs, unveils the relaxation dynamics of hot electrons in single layer graphene and the formation and radiative recombination via stimulated emission of biexcitons in ultra-narrow, structurally well-defined nanoribbons (GNRs). By recently developed ultrafast Time- and Angle-resolved Photo-Electron Spectroscopy (TR-ARPES) we investigate electronic states and spin dynamics close to the Dirac cone, in graphene and metal chalcogenide topological insulators (TI) under fs strong laser excitation, in view of spintronic applications.
Silvia Maria Pietralunga; Cristian Manzoni; Ettore Carpene; Davide Bugini; Stefano Dal Conte; Hamoon Hedayat; Giancarlo Soavi; Mohammad J. Vahid; Tersilla Virgili; Maurizio Zani; Claudia Dallera; Roman Sordan; Alberto Tagliaferri; Giulio Cerullo. Advanced spectroscopies of graphene and 2D materials. 2016 18th International Conference on Transparent Optical Networks (ICTON) 2016, 1 -4.
AMA StyleSilvia Maria Pietralunga, Cristian Manzoni, Ettore Carpene, Davide Bugini, Stefano Dal Conte, Hamoon Hedayat, Giancarlo Soavi, Mohammad J. Vahid, Tersilla Virgili, Maurizio Zani, Claudia Dallera, Roman Sordan, Alberto Tagliaferri, Giulio Cerullo. Advanced spectroscopies of graphene and 2D materials. 2016 18th International Conference on Transparent Optical Networks (ICTON). 2016; ():1-4.
Chicago/Turabian StyleSilvia Maria Pietralunga; Cristian Manzoni; Ettore Carpene; Davide Bugini; Stefano Dal Conte; Hamoon Hedayat; Giancarlo Soavi; Mohammad J. Vahid; Tersilla Virgili; Maurizio Zani; Claudia Dallera; Roman Sordan; Alberto Tagliaferri; Giulio Cerullo. 2016. "Advanced spectroscopies of graphene and 2D materials." 2016 18th International Conference on Transparent Optical Networks (ICTON) , no. : 1-4.
The combination of continuum and ultrafast pump–probe spectroscopy, in viscous and non-viscous environments, with DFT and TDDFT calculations, is effective in unraveling important features of the twisted intramolecular charge transfer mechanism in a new push–pull molecule that possesses aggregation induced emission properties.
M. M. Mróz; S. Benedini; A. Forni; C. Botta; D. Pasini; Elena Cariati; T. Virgili. Long-living optical gain induced by solvent viscosity in a push–pull molecule. Physical Chemistry Chemical Physics 2016, 18, 18289 -18296.
AMA StyleM. M. Mróz, S. Benedini, A. Forni, C. Botta, D. Pasini, Elena Cariati, T. Virgili. Long-living optical gain induced by solvent viscosity in a push–pull molecule. Physical Chemistry Chemical Physics. 2016; 18 (27):18289-18296.
Chicago/Turabian StyleM. M. Mróz; S. Benedini; A. Forni; C. Botta; D. Pasini; Elena Cariati; T. Virgili. 2016. "Long-living optical gain induced by solvent viscosity in a push–pull molecule." Physical Chemistry Chemical Physics 18, no. 27: 18289-18296.