A5069522743- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- 2D Materials and Applications
- Solid-state spectroscopy and crystallography
- Optical properties and cooling technologies in crystalline materials
- Nanocluster Synthesis and Applications
- Luminescence and Fluorescent Materials
- Nanowire Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Luminescence Properties of Advanced Materials
- Photonic Crystals and Applications
- Nonlinear Optical Materials Studies
- Carbon and Quantum Dots Applications
- Advanced Semiconductor Detectors and Materials
- Surface Roughness and Optical Measurements
- Organic Light-Emitting Diodes Research
- Strong Light-Matter Interactions
- Electronic and Structural Properties of Oxides
- Advanced Photonic Communication Systems
- Optical and Acousto-Optic Technologies
- Advanced Fiber Laser Technologies
- Analytical Chemistry and Sensors
- Metamaterials and Metasurfaces Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
City University of Hong Kong
2023-2025
ITMO University
2019-2023
A large volume, scalable synthesis procedure of HgTe quantum dots (QDs) capped initially with short-chain conductive ligands ensures ligand exchange-free and simple device fabrication. An effective n- or p-type self-doping QDs is achieved by varying cation-anion ratio, as well shifting the Fermi level position introducing single- double-cyclic thiol ligands, that is, 2-furanmethanethiol (FMT) 2,5-dimercapto-3,4-thiadiasole (DMTD) in synthesis. This allows for preserving intact surface QDs,...
Understanding the photosensitization mechanisms in Yb3+-doped perovskite nanocrystals is crucial for developing their anticipated photonic applications. Here, we address this question by investigating near-infrared photoluminescence of mixed-halide CsPbClxBr3–x as a function temperature and revealing its strong dependence on stoichiometry host matrix. To explain observed experimental trends, developed theoretical model which energy transfer from matrix to Yb3+ ions occurs through...
Yb 3+ -CsPbCl x Br 3− perovskite nanocrystals with a high two-photon absorption cross-section of 2.3 × 10 5 GM embedded into amphiphilic silica microspheres emit visible and near-infrared light under infrared excitation in toluene water.
Producing heterostructures of cesium lead halide perovskites and metal-chalcogenides in the form colloidal nanocrystals can improve their optical features stability, also govern recombination charge carriers. Herein, synthesis red-emitting CsPbI
Carbon dots (CDs) are fluorescent carbon nanomaterials that considered for applications in optoelectronics, sensorics, and biofields due to their low‐cost robust synthesis, versatile optical properties. Herein, it is demonstrated how chemical functionalization of hydrophilic or amphiphilic CDs with polyethylene glycol influences energy level structure hence the emission Functionalization results an increase quantum yield: from 30% 75% 20% 25% CDs. The estimated absolute values levels,...
Abstract In order to advance the development of quantum emitter‐based devices, it is essential enhance light‐matter interactions through coupling between semiconductor dots with high quality factor resonators. Here, efficient tuning emission properties HgTe in infrared spectral region demonstrated by them a plasmonic metasurface that supports bound states continuum. The metasurface, composed an array gold nanobumps, fabricated using single‐step direct laser printing, opening up new...
Anion-assisted cation doping in a nonpolar solvent at room temperature has been proposed as universal method to create multiple-band emitting lead halide perovskite nanostructures.
Ternary quantum dots (QDs) are very promising nanomaterials with a range of potential applications in photovoltaics, light-emitting devices, and biomedicine. Despite quite intensive studies ternary QDs over the last years, specific relaxation channels involved their emission mechanisms still poorly understood, particularly corresponding core-shell nanostructures. In present work, we have studied recombination pathways AgInS2 stabilized ZnAgInS alloy layer ZnS shell (AIS/ZAIS/ZnS QDs) using...
Semiconductor colloidal nanoplatelets (NPLs) are a promising new class of nanostructures that can bring much impact on lightning technologies, light-emitting diodes (LED), and laser fabrication. Indeed, great progress has been made in optimizing the optical properties NPLs for visible spectral range, which already implementation number effective devices their basis possible. To date, state-of-the-art near-infrared (NIR)-emitting significantly inferior to visible-range counterparts, although...
In recent years, there has been rapid progress in the development of photonic devices based on lead halide perovskite nanocrystals since they possess a set unique optical and charge transport properties. However, main limiting factor for their subsequent application is poor stability against exposure to adverse environmental conditions. this work, study composite material CsPbBr3 embedded porous silica microspheres presented. We developed two different approaches change interface between...
Abstract Lead halide perovskite nanocrystals are attracting a lot of attention due to their superior optical properties, such as narrow emission bandwidths, and high photoluminescence quantum yields. Still, they far from practical implementation, since can rather easily degrade under ambient conditions, even more so at humidity, temperature, UV light exposure, which has triggered on‐going search for the suitable protective host matrices. We report luminescent composite material based on...
Over recent years, quantum dots (QDs) based on ternary metal dichalcogenides have attracted a lot of attention due to their unique properties and range potential applications. Here, we review the latest studies optical AgInS2/ZnS QDs with emphasis theoretical modeling, present our investigations electronic transitions invisible in unstructured absorption spectra QDs. The analysis absorption, photoluminescence excitation (PLE), magnetic circular dichroism (MCD) hydrophobic hydrophilic...
Nanostructured luminescent materials based on perovskite nanocrystals (p-NCs) are attractive since their optical properties can be tuned in a wide spectral range with high luminescence quantum yields and lifetimes, however, they lack stability. In this work, the of highly colloidal p-NCs (CsPbX3, where X = Cl/Br, Br, I) embedded porous opal matrices presented. It is shown that photoluminescence into possess increased longtime stability its kinetic parameters under ambient conditions. LEDs...
Due to their high resonant third-order nonlinear response, lead sulfide quantum dots (QDs) are potential materials for applications in the field of optics. In this paper, we implement Z-scan method study response QDs colloidal solutions. We managed measure purely intrinsic free thermal contribution. report that QD per shows an unconventional increase. A figure merit nonlinearity grows as a power function with factor 2.9.
Nowadays, multiplex analysis is very popular, since it allows to detect a large number of biomarkers simultaneously. Traditional usually based on changes photoluminescence (PL) intensity and/or PL band spectral positions in the presence analytes. Using lifetime as an additional parameter might increase efficiency methods. Quantum dots (QDs) can be used luminescent markers for analysis. Ternary in-based QDs are great alternative traditional Cd-based one. possess all advantages QDs, including...
Lead halide perovskite nanoplatelets (NPls) attract significant attention due to their exceptional and tunable optical properties. Doping is a versatile strategy for modifying improving the properties of colloidal nanostructures. However, protocols B-site doping have been rarely reported 2D NPls. In this work, we investigated post-synthetic treatment CsPbBr3 NPls with different Cd2+ sources. We show that interplay between precursor, NPl concentrations, ligands determines kinetics process....
Ternary hybrid photovoltaics based on polymers, fullerenes, and colloidal semiconductor quantum dots (QDs) bring together high efficiency technological flexibility. To increase the performance of such solar cells, a thorough control over both film morphology charge transport is required. In present work, optical properties films binary ternary blends PbS QDs with poly(3-hexylthiophene-2,5diyl) [6,6]-phenyl C71 butyric acid methyl ester have been investigated by steady-state time-resolved...
Perovskite nanocrystals (NCs) are currently one of the most efficient optical materials in visible spectral range. Much attention is paid to extending their efficiency near-infrared (NIR) region, which will significantly benefit applications optoelectronics, photonics, and biomedicine. To further promote this effort, we developed a novel synthetic approach dual-band emitting Yb3+-doped perovskite NCs, whose stoichiometry hence position photoluminescence can be tuned independently...
The ability of light manipulation at a sub-wavelength scale metal halide perovskite-based nanostructures through nanophotonic design were employed for advanced optical and optoelectronic applications. While these could be efficiently tuned in the visible spectral range, their operation infrared wavelengths is still challenging. Herein, we illustrate that islandlike films lead-free CH3NH3SnI3 can generate strong tunable Mie-type resonances near-infrared range. Two critical factors contribute...
The field-effect transistor method is used to study the mobility of charge carriers in layers lead sulfide nanocrystals with ligands tetrabutylammonium iodide and 1,2-ethanedithiol create solar cells. difference between operating a ambient air an inert atmosphere demonstrated. It shown that, air, processes charging are activated when current flows, influence polarization interface insulator on measurement analyzed. Different reactions light have been demonstrated, showing significant...
Doping the semiconductor nanocrystals is one of most effective ways to obtain unique materials suitable for high-performance next-generation optoelectronic devices. In this study, we demonstrate a novel nanomaterial near-infrared spectral region. To do this, developed partial cation exchange reaction on HgTe nanoplatelets, substituting Hg cations with Pb cations. Under optimized conditions and precursor ratio, photoluminescence band shifts ~1100 nm quantum yield 22%. Based steady-state...
Here we report on the development and investigation of a novel multiplex assay model based polymer microspheres (PMS) encoded with ternary AIS/ZnS quantum dots (QDs). The system was prepared via layer-by-layer deposition technique. Our studies Förster resonance energy transfer (FRET) between QD-encoded two different cyanine dyes have demonstrated that QD photoluminescence (PL) quenching steadily increases decrease in QD-dye distance. We found sensitized dye PL intensity demonstrates clear...