A5034089618- Quantum Dots Synthesis And Properties
- Semiconductor Quantum Structures and Devices
- Gold and Silver Nanoparticles Synthesis and Applications
- Photosynthetic Processes and Mechanisms
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic Light-Emitting Diodes Research
- Spectroscopy and Quantum Chemical Studies
- Advanced Semiconductor Detectors and Materials
- Plasmonic and Surface Plasmon Research
- Quantum and electron transport phenomena
- Organic Electronics and Photovoltaics
- Luminescence and Fluorescent Materials
- Molecular Junctions and Nanostructures
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Porphyrin and Phthalocyanine Chemistry
- Photonic Crystals and Applications
- Advanced biosensing and bioanalysis techniques
- Luminescence Properties of Advanced Materials
- Graphene research and applications
- Photochemistry and Electron Transfer Studies
- Magnetic properties of thin films
- Photonic and Optical Devices
Institute of Physics
2016-2025
Nicolaus Copernicus University
2016-2025
Czech Academy of Sciences, Institute of Physics
2013-2024
Purdue University West Lafayette
2023
Military University of Technology in Warsaw
2023
Astronomy and Space
2014-2021
Wroclaw Research Centre EIT+ (Poland)
2015
Poznań University of Technology
2015
Center for NanoScience
2006-2009
University of Cincinnati
2002-2008
Plasmonic nanoparticles are commonly used to tune and direct the radiation from electric dipolar emitters. Less progress has been made towards understanding complementary systems of magnetic nature. However, it recently shown that high-index dielectric spheres can act as effective antennas. Here we explore concept coupling antennas with either an or emitter in a similar fashion purely reported previously. We investigate enhancement comprising admixtures these elements perform full study its...
Ensemble and single-molecule spectroscopy demonstrates that both emission absorption of peridinin−chlorophyll−protein photosynthetic antennae can be largely enhanced through plasmonic interactions. We find up to 18-fold increase the chlorophyll fluorescence for complexes placed near a silver metal layer. This enhancement, which leaves no measurable effects on protein structure, is observed when exciting either or carotenoid attributed predominantly an excitation rate in antenna. The...
Stacking atomic monolayers of semiconducting transition metal dichalcogenides (TMDs) has emerged as an effective way to engineer their properties. In principle, the staggered band alignment TMD heterostructures should result in formation interlayer excitons with long lifetimes and robust valley polarization. However, these features have been observed simultaneously only MoSe2/WSe2 heterostructures. Here we report on observation long-lived exciton emission a MoS2/MoSe2/MoS2 trilayer van der...
We report on optical properties of CdTe self-assembled quantum dots (SADs) grown by molecular beam epitaxy ZnTe. Formation SADs was achieved deposition 1.5–2.5 monolayers at a substrate temperature 420 °C and applying growth interrupts for few seconds in Cd flux. The resulting have typical diameter 2 nm sheet density 1012 cm−2. At T=2 K the photoluminescence (PL) spectra consist two emission lines. high-energy line originates from excitonic recombination wetting layer while low-energy PL...
Abstract There is growing evidence that for a comprehensive insight into the function of plant genes, it crucial to assess their functionalities under wide range conditions. In this study, we examined role LESION SIMULATING DISEASE1 (LSD1), ENHANCED DISEASE SUSCEPTIBILITY1 (EDS1), and PHYTOALEXIN DEFICIENT4 (PAD4) in regulation photosynthesis, water use efficiency, reactive oxygen species/hormonal homeostasis, seed yield Arabidopsis (Arabidopsis thaliana) grown laboratory field. We...
Mixed-halide lead perovskites have attracted significant attention in the field of photovoltaics and other optoelectronic applications due to their promising bandgap tunability device performance. Here, changes photoluminescence photoconductance solution-processed triple-cation mixed-halide (Cs0.06 MA0.15 FA0.79 )Pb(Br0.4 I0.6 )3 perovskite films (MA: methylammonium, FA: formamidinium) are studied under solar-equivalent illumination. It is found that illumination leads localized surface...
Perovskite nanoplatelets (NPls) hold promise for light-emitting applications, having achieved photoluminescence quantum efficiencies approaching unity in the blue wavelength range, where other metal-halide perovskites have typically been ineffective. However, external (EQEs) of blue-emitting NPl diodes (LEDs) reached only 0.12%. In this work, we show that LEDs are primarily limited by a poor electronic interface between emitter and hole injector. We NPls remarkably deep ionization potentials...
The MAPb1–xSnxI3 (x = 0–1) (MA methylammonium) perovskite family comprises a range of ideal absorber band gaps for single- and multijunction solar cells. Here, we use spectroscopic measurements to reveal hitherto unknown fundamental properties this materials family. Temperature-dependent transmission results show that the temperature tetragonal orthorhombic structural transition decreases with increasing tin content. Through low-temperature magnetospectroscopy, exciton binding energy is...
The generation of singlet oxygen in aqueous colloids nanocrystalline TiO2 (anatase) modified by organic chelating ligands forming surface TiIV complexes was studied. Detailed studies revealed a plausible and to date unappreciated influence near-infrared irradiation on at the TiO2. To detect 1O2, direct indirect methods have been applied: photon counting technique enabling time-resolved measurements 1O2 phosphorescence, fluorescence product interaction with Singlet Oxygen Sensor Green (SOSG)....
The structural and photophysical characterization of new Re(<sc>i</sc>) complexes was reported.
A set of thioxanthone derivatives bearing strongly electron-donating dialkylamino groups have been synthesized efficiently via the Buchwald–Hartwig, Sonogashira, and Heck reactions. Compounds possessing both one two donors prepared. Their optical properties proved to be intriguing. The presence amino group alone increased fluorescence quantum yield 100 times. Dyes arylethylene arylethynyl linkages absorbed UV radiation violet light while emitting (weakly) red light, as a consequence...
Exciton fine structure splitting in semiconductors reflects the underlying symmetry of crystal and quantum confinement. Since latter factor strongly enhances exchange interaction, most work has focused on nanostructures. Here, we report first observation bright exciton a bulk semiconductor crystal, where impact confinement can be specifically excluded, giving access to intrinsic properties material. Detailed investigation photoluminescence reflection spectra methylammonium lead tribromide...
Novel symmetrical anthracene derivatives with bulky carbazolyl‐fluorene, diphenylamino‐fluorene, or carbazolyl‐carbazole units connected to the frame through an ethynyl bridge were synthesized in excellent yield by using Sonogashira cross‐coupling. The dyes increases π‐electron conjugation and substituents considerably attenuate intermolecular interactions. possess high thermal stability, tremendous solubility common organic solvents, especially photoluminescence quantum ( Φ f ) solution...
Abstract Photon avalanche (PA) is a highly nonlinear mode of upconversion that characterized by 100–1000‐fold increase in luminescence intensity upon minute increments pumping power. The practical realization numerous possible nano‐bio‐technology applications utilizing the PA phenomenon will require information on its susceptibility to material volume and surface. Here, these parameters are investigated via experimental theoretical PA. two‐color, emission at 475 800 nm clearly observed bulk...
Data processing and storage in electronic devices are typically performed as a sequence of elementary binary operations. Alternative approaches, such neuromorphic or reservoir computing, rapidly gaining interest where data is relatively slow, but can be more comprehensive way massively parallel, like neuronal circuits. Here, time-domain all-optical information capabilities photon-avalanching (PA) nanoparticles at room temperature discovered. Demonstrated functionality resembles properties...
We investigated the angular radiation patterns, a key characteristic of an emitting system, from individual silver nanowires decorated with rare earth ion-doped nanocrystals. Back focal plane patterns nanocrystal photoluminescence after local two-photon excitation can be described by two emission channels: propagating surface plasmons in nanowire followed leakage and direct dipolar observed also absence nanowire. Theoretical modeling reproduces which strongly depend on position along Our...
The influence of plasmon excitations in spherical gold nanoparticles on the optical properties a light-harvesting complex 2 (LH2) from purple bacteria Rhodopseudomonas palustris has been studied. Systematic analysis is facilitated by controlling thickness silica layer between Au and LH2 complexes. Fluorescence complexes features substantial increase when these are separated 12 nm nanoparticles. At shorter distances, non-radiative quenching leads to decrease fluorescence emission. enhancement...
In this contribution, we fabricate hybrid constructs based on a natural light-harvesting complex, peridinin–chlorophyll a–protein, coupled to dimer optical antennas self-assembled with the help of DNA origami technique. This approach enables controlled positioning individual complexes at hotspot large, colloidal gold and silver nanoparticles. Our allows us selectively excite different pigments present in harvesting reaching fluorescence enhancement 500-fold. work expands range functional for...
Halide perovskites are emerging as valid alternatives to conventional photovoltaic active materials owing their low cost and high device performances. This material family also shows exceptional tunability of properties by varying chemical components, crystal structure, dimensionality, providing a unique set building blocks for new structures. Here, highly stable self-assembled lead-tin perovskite heterostructures formed between low-bandgap 3D higher-bandgap 2D components demonstrated. A...
Multimodal polymer encapsulated CdSe/Fe3O4 nanoplatforms with dual optical and magnetic properties have been fabricated. We demonstrate that nanocapsules (NCs) upon excitation UV radiation or NIR fs-laser exhibit intense one- two-photon emission at 535 nm, whereas the combination of an alternating field 808 nm IR laser results in heat generation. Since anticancer therapies require relatively high doses Fe3O4 nanoparticles (NPs) to induce biologically relevant temperature jumps, therapeutic...
In the quest to construct photonic circuits, key issue is coupling of light into subwavelength devices. While plasmonic waveguides can be used as building blocks in novel nanodevices, for efficient energy transmission, distance between nanostructures must not exceed a few nanometers due rapidly decreasing coupling. Here, we study system two silver nanowires positioned precisely order control separation their ends. such structure, any measurable propagation possible upon direct contact, when...
We demonstrate that resonant excitation of CdMnTe self-assembled quantum dots creates an ensemble spin-polarized magnetic polarons at B=0 T. The strong spatial confinement characteristic significantly increases the stability so optically-induced spin alignment is observed for temperatures &gt;120 K.