A5032822326- Spectroscopy and Quantum Chemical Studies
- Photosynthetic Processes and Mechanisms
- Photochemistry and Electron Transfer Studies
- Photoreceptor and optogenetics research
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Organic Electronics and Photovoltaics
- Spectroscopy and Laser Applications
- Molecular Junctions and Nanostructures
- Radiation Detection and Scintillator Technologies
- Supramolecular Chemistry and Complexes
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Perovskite Materials and Applications
- Luminescence Properties of Advanced Materials
- Advanced Chemical Physics Studies
- Atmospheric Ozone and Climate
- Marine and coastal ecosystems
- Atomic and Subatomic Physics Research
- Molecular Spectroscopy and Structure
- Metal-Catalyzed Oxygenation Mechanisms
- Light effects on plants
- Surface Chemistry and Catalysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Fullerene Chemistry and Applications
Center for Physical Sciences and Technology
2013-2020
Lund University
2011-2017
Getinge (Sweden)
2012-2013
University of Groningen
2006-2010
Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine
2006-2007
Optica
2006-2007
Vilnius University
2003-2006
Chlorosomes are light-harvesting antennae that enable exceptionally efficient light energy capture and excitation transfer. They found in certain photosynthetic bacteria, some of which live extremely low-light environments. In this work, chlorosomes from the green sulfur bacterium Chlorobaculum tepidum were studied by coherent electronic two-dimensional (2D) spectroscopy. Previously uncharacterized ultrafast transfer dynamics followed, appearing as evolution 2D spectral line-shape during...
The spatial structure of the J-aggregates meso-tetra(4-sulfonatophenyl)porphine (TPPS4) formed in acidic aqueous solutions and coated on silicon substrates was analyzed by means atomic force microscopy (AFM). AFM experiments indicate presence stripelike J-aggregate structures surface. size individual stripes ranged from 4.5 × 40 200 to 1000 nm3 (height width length). length varied, whereas stripe thickness remained unchanged. stacked into larger domains, "fibers", containing typically 2−20...
In many potential applications of two-dimensional (2D) electronic spectroscopy the excitation energies per pulse are strictly limited, while samples strongly scattering. We demonstrate a technique, based on double-modulation incident laser beams with mechanical choppers, which can be implemented in almost any non-collinear four wave mixing scheme including 2D setup. The technique virtually eliminates artifacts or "ghost" signals spectra, arise due to scattering and accumulation long-lived...
The optical properties of tubular aggregates formed by self-assembly zwitterionic meso-tetra(4-sulfonatophenyl)porphyrin (TPPS4) molecules are studied through a combination experimental and theoretical techniques. interest in these systems, with diameters 18 nm lengths extending up to micrometers, derives from their strong interaction light similarity natural light-harvesting systems for photosynthesis. absorption linear dichroism spectra obtained the spectral region 300 750 nm, which...
A novel polyimide (PI) and imide compound emitting prominent reddish-orange fluorescence under excitation by UV light were prepared based on 3-hydroxypyromellitic dianhydride (PHDA), their properties examined. The steady-state spectrum of a PI film displayed an emission band at 590 nm with very large Stokes shift (ν = 10 448 cm–1) via the excited-state intramolecular proton transfer (ESIPT), while time-resolved showed rapid decay enol form around 400 within 15 ps. Transient absorption...
Light-harvesting in photosynthesis is determined by the excitonic interactions disordered antennae and coupling of collective electronic excitations to fast nuclear motions, producing efficient energy transfer with a complicated interplay between exciton vibrational coherences. Two-dimensional spectroscopy (2DES) powerful tool study presence these coherences photosynthetic complexes. However, unambiguous assignment nature observed still under debate. In this paper we apply 2DES an...
Time‐resolved spectroscopic study of the photoluminescence response to femtosecond pulse excitation and free carrier absorption at different wavelengths, thermally stimulated luminescence measurements investigation differential are applied amend available data on transfer in GAGG:Ce scintillators, an electronic energy‐level diagram this single crystal is suggested explain influence codoping with divalent Mg kinetics light yield. The conclusions generalized by comparison aliovalent doping...
The role of quantum coherence in photochemical functions molecular systems such as photosynthetic complexes is a broadly debated topic. Coexistence and intermixing electronic vibrational coherences has been proposed to be responsible for the observed long-lived high energy transfer efficiency. However, clear experimental evidence with different origins operating at same time elusive. In this work, multidimensional spectra obtained from six-porphyrin nanoring system are analyzed detail...
A colorless and thermally stable polyimide film exhibiting dual fluorescence phosphorescence emission promising for solar spectral down-converters.
Abstract Molecular rotary motors, though common in nature, were first synthesized rather recently. One of the most promising categories light‐driven molecular motors which allow for optical control is based on helical overcrowded alkenes. In this category rotation motor's rotor involves four discrete steps: fast light‐induced cis‐trans isomerisation followed by a thermally activated step, same steps are repeated once more to complete full 360° cycle. Though rate mainly limited duration...
The influence of co-doping Gd3Al2GA3O12:Ce (GAGG:Ce) scintillator with magnesium on the rise time luminescence response was studied in two GAGG:Ce crystals grown nominally identical conditions except Mg one them. Time-resolved photoluminescence spectroscopy and free carrier absorption techniques were exploited. It is evidenced that decreases down to sub-picosecond domain. Meanwhile, light yield by ∼20%. Thus, feasibility exploitation fast edge for ultrafast timing scintillation detectors...
Light-harvesting in fucoxanthin-chlorophyll protein (FCP) of diatoms is performed by a cluster chromophores: chlorophylls (Chl a), c2 c2), and carotenoids fucoxanthins. It well-known that energy captured fucoxanthin transferred to Chl on subpicosecond time scale. However, the flow channel connecting remained elusive. In this study, transfer between molecules FCP complex from diatom algae C. meneghiniana at room temperature investigated using pump–probe coherent two-dimensional electronic...
Energy transfer processes and coherent phenomena in the fucoxanthin–chlorophyll protein complex, which is responsible for light harvesting function marine algae diatoms, were investigated at 77 K by using two-dimensional electronic spectroscopy. Experiments performed on femtosecond picosecond timescales led to separation of spectral dynamics, witnessing evolutions coherence population states system region Qy transitions chlorophylls a c. Analysis dynamics allowed us identify chlorophyll...
We report temperature-dependent steady-state and time-resolved fluorescence studies to probe the exciton dynamics in double-wall tubular J-aggregates formed by self-assembly of dye 3,3'-bis(3-sulfopropyl)-5,5',6,6'-tetrachloro-1,1'-dioctylbenzimidacarbocyanine. focus on lowest energy band, originating from inner cylindrical wall. At low temperatures, experiments reveal a nonexponential decay fluorescence, with typical time scale that depends emission wavelength. these temperatures we also...
In this Perspective, we demonstrate that the published FCP structures are not entirely consistent with 2D spectroscopy results for <italic>Cyclotella meneghiniana</italic>. To remedy issue, propose pigment arrangement in trimeric species.
The synthesis and characterisation of a novel coumarin donor-perylene bisimide acceptor light-harvesting system is reported, in which an energy-transfer efficiency >99% achieved. Comparison the excited-state properties donor-acceptor with model compounds revealed that although photophysical perylene unit are affected considerably by nature substituent at imide positions solvent employed, through-bond interaction between donor units negligible. Energy transfer present can be described as...
Precision of two-dimensional (2D) electronic spectroscopy can be affected by imprecise calibration the optical spectrometer and coherence time delay line. This would result in 2D spectral line shapes with twisted phase, where absorptive dispersive parts signal are mixed unrecoverable. We demonstrate two efficient easily implementable techniques for precise wedge-based that assure acquisition correct phase measurements.
Organic–inorganic hybrid perovskites are a new class of semiconducting materials currently yielding high‐performance solar cells. They also attractive for fabrication photodetectors, which based on similar operating principles. Herein an easily producible perovskite photodetector with lateral architecture is reported fabricated by one‐step solution processing technique planar interdigitated electrodes. Despite the simple structure, demonstrates comparable, or even some superior...
The static and time‐resolved optical response of 5, 5 ′ , 6, 6 ‐tetrachlorobenzimidacarbocyanine chromophore‐based tubular double‐wall molecular aggregates is studied. linear dichroism absorption spectra have the same basic structure for all investigated essentially showing a set narrow highly polarized bands originating from inner outer wall excitations. exact positions strengths are influenced by choice side groups various additives. Time‐resolved fluorescence measurements show substantial...