A5100654847- Laser-Matter Interactions and Applications
- Perovskite Materials and Applications
- Mass Spectrometry Techniques and Applications
- Quantum Dots Synthesis And Properties
- 2D Materials and Applications
- Graphene research and applications
- Spectroscopy and Quantum Chemical Studies
- Chalcogenide Semiconductor Thin Films
- Semiconductor Quantum Structures and Devices
- Molecular Junctions and Nanostructures
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Quantum and electron transport phenomena
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Spectroscopy and Laser Applications
- Quantum optics and atomic interactions
- Carbon Nanotubes in Composites
- Ion-surface interactions and analysis
- Optical properties and cooling technologies in crystalline materials
- Photochemistry and Electron Transfer Studies
- Nuclear Physics and Applications
Dalian Institute of Chemical Physics
2006-2025
Chinese Academy of Sciences
2006-2025
University of Cologne
2017-2021
New York University
2019
University of Waterloo
2007-2008
State Key Laboratory of Molecular Reaction Dynamics
2006
University of Maryland, College Park
1990-1997
Loughborough University
1997
Abstract The ability to deliver electrons is vital for dye-based photocatalysts. Conventionally, the aromatic stacking-based charge-transfer complex increases photogenerated electron accessibility but decreases energy of excited-state dyes. To circumvent this dilemma, here we show a strategy by tuning stacking mode By decorating naphthalene diimide with S-bearing branches, S···S contact-linked string created in coordination polymer, thereby enhancing mobility while simultaneously preserving...
We demonstrate the alignment-preserving transfer of parallel graphene nanoribbons (GNRs) onto insulating substrates. The photophysics such samples is characterized by polarized Raman and photoluminescence (PL) spectroscopies. scattered light PL are along GNR axis. cross section as a function excitation energy has distinct excitonic peaks associated with transitions between one-dimensional parabolic subbands. find that GNRs intrinsically low but can be strongly enhanced blue laser irradiation...
Luminescent solar concentrators (LSCs) have emerged as a disruptive technology that can potentially enable carbon-neutral buildings. The issues with current LSCs, however, are low optical efficiencies and limited long-term outdoor stability. Here we simultaneously address them by developing an LSC aggregation-induced-emission (AIE) molecules embedded in polydimethylsiloxane (PDMS) matrix. AIE-emitter displayed near unity emission quantum yield when the PDMS apparent absorption-emission...
Abstract Lead halide perovskite quantum dots (QDs) have recently emerged as a promising material platform for information processing owing to their strong light–matter interaction and relatively long‐lived optical spin coherences. In particular, the coherence of fine‐structure bright excitons is sustainable up room temperature can be observed even at an ensemble level. Here modulation polarization these in CsPbI 3 QDs manipulation time‐domain coherent dynamics using longitudinal magnetic...
Abstract Colloidal quantum‐dot (QD) lasing is normally achieved in close‐packed solid‐state films, as a high QD volume fraction required for stimulated emission to outcompete fast Auger decay of optical‐gain‐active multiexciton states. Here new type liquid optical‐gain medium demonstrated, which compact compositionally‐graded QDs (ccg‐QDs) that feature strong suppression are liquefied using small amount solvent. Transient absorption measurements ccg‐QD suspensions reveal broad‐band optical...
Optical gain of colloidal quantum dots (QDs) is often attained in the multiexciton regime, which strongly complicates their lasing applications as lifetime limited by nonradiative Auger recombination occurring typically on picosecond time scale. In principle, low-threshold can be achieved if gain-active emission has a sizable red shift compared to absorption. But, this mechanism been rarely observed typical QDs featuring small Stokes due weak electron–phonon coupling. Here, we report...
Abstract Colloidal semiconductor nanoplatelets (NPLs) have emerged as low‐cost and free‐standing alternates of traditional quantum wells. The giant heavy‐ light‐hole splitting in NPLs allows for efficient optical spin injection. However, the electron lifetimes prototypical CdSe are within a few picoseconds, likely limited by strong electron‐hole exchange these quantum‐ dielectric‐confined materials. Here how this hurdle can be overcome with engineered NPL‐heterostructures is demonstrated. By...
Coherent interaction between matter and light field induces both optical Stark effect Bloch-Siegert shift. Observing the latter has been historically challenging, because it is weak often accompanied by a much stronger Herein, controlling helicity, we can largely restrict these two effects to different spin-transitions in CsPbI3 perovskite quantum dots, achieving room-temperature shift as strong 4 meV with near-infrared pulses. The ratio shifts however systematically higher than prediction...
In contrast to regular J- and H-aggregates, thin film squaraine aggregates usually have broad absorption spectra containing both J-and H-like features, which are favorable for organic photovoltaics. Despite being successfully applied in photovoltaics years, a clear interpretation of these optical properties by relating them specific excited states an underlying aggregate structure has not been made. this work, static transient spectroscopy on aggregated n-butyl anilino squaraines, we provide...
Dissociative ionization of ${\mathrm{N}}_{2}$ induced by intense picosecond radiation has been studied. A two-step multiphonon model, based on through vertical transitions and spontaneous dissociation ${\mathrm{N}}_{2}^{\mathit{z}+}$ (Z\ensuremath{\ge}2) via Coulomb non-Coulombic potentials curves, is presented to explain the origin kinetic energies atomic ions observed. The model predicts that occurs near internuclear separation neutral, charge-asymmetric channels are important, curves will...
Rapid and accurate immune monitoring plays a decisive role in effectively treating immune-related diseases especially at point-of-care, where an immediate decision on treatment is needed upon precise determination of the patient status. Derived from emerging clinical demands, there urgent need for cytokine immunoassay that offers unprecedented sensor performance with high sensitivity, throughput, multiplexing capability, as well short turnaround time low system complexity, manufacturability,...
We present a flexible and efficient ultrafast time-resolved spontaneous Raman spectroscopy setup to study collective excitation quasi-particle dynamics in quantum materials. The has broad energy tuning range extending from the visible near infrared spectral regions for both pump probe pulses. Additionally, balance between time-resolution can be controlled. A high light collecting efficiency is realized by numerical aperture collection optics high-throughput spectrometer. demonstrate...
Intersubband transition was recently discovered in colloidal nanoplatelets, but the associated intersubband carrier relaxation dynamics remains poorly understood. In particular, it is crucial to selectively excite and follow hot electron absence of valence-band holes. This achieved herein by exciting predoped electrons CdSe/ZnS nanoplatelets using near-infrared femtosecond pulses monitoring nonequilibrium broad-band visible pulses. We find that
Time-resolved spontaneous Raman experiments on 7-AGNRs show the presence of a long lived excitonic dark state together with short and trap states.
Abstract Long linear carbon chains are attracting intense interest arising from their remarkable properties, such as the tunable direct energy gap, high mechanical hardness, and Raman response cross section, which would play a great role in potential applications future nanotechnology. Here excitonic transitions associated relaxation dynamics of nanotube confined long comprehensively interrogated by using steady state time‐resolved spectroscopies. The exciton occurs on hundred picoseconds...
The competition between photoionization and spontaneous dissociation involving the 3Π states of CO has been investigated both experimentally theoretically. In this study we analyzed mass kinetic energy spectra photofragments generated after irradiating with a line narrowed (≊0.75 cm−1) tunable ArF* laser (λ≊193 nm) calculated cross section (3.2 Mb) for photoionizing c Rydberg state at excitation energy. basic conclusions are that interaction valence near 12.8 eV causes rapid (picosecond time...
Atomically thin layer transition metal dichalcogenides have been intensively investigated for their rich optical properties and potential applications on nano-electronics. In this work, we study the incoherent phonon exciton population dynamics in monolayer WS2 by time-resolved Resonance Raman scattering spectroscopy. Upon excitation of transition, both Stokes anti-Stokes strength longitudinal acoustic two modes exhibit large reduction. Based assumption quasi-equilibrium distribution, hidden...
Abstract Monolayer transition metal dichalcogenides (TMDCs) hold the best promise for next generation optoelectronic and valleytronic devices. However, their actual performance is usually largely affected by presence of inevitable defects. Therefore, a detailed understanding influence defects on dynamic properties crucial optimizing near future implementations. Here, exciton population valley scattering dynamics in chemical vapor deposition grown large size monolayer WSe 2 with naturally...
Abstract Exciton intervalley scattering, annihilation, relaxation dynamics, and diffusive transport in monolayer transition metal dichalcogenides are central to the functionality of devices based on them. Here, these properties a large‐size exfoliated high‐quality MoSe 2 addressed directly using heterodyned transient grating spectroscopy at room temperature. While free exciton population is found be long‐lived (≈230 ps), an extremely fast scattering (≤170 fs) observed, leading negligible...