A5081441999- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Plasmonic and Surface Plasmon Research
- Chalcogenide Semiconductor Thin Films
- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic Crystals and Applications
- Luminescence Properties of Advanced Materials
- Photonic and Optical Devices
- 2D Materials and Applications
- Solid-state spectroscopy and crystallography
- Metamaterials and Metasurfaces Applications
- Semiconductor materials and interfaces
- Advanced Semiconductor Detectors and Materials
- Spectroscopy and Laser Applications
- Luminescence and Fluorescent Materials
- Electronic and Structural Properties of Oxides
- Solid State Laser Technologies
- Thermal Expansion and Ionic Conductivity
- Thermal properties of materials
- Strong Light-Matter Interactions
- Semiconductor Quantum Structures and Devices
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Transition Metal Oxide Nanomaterials
- Ga2O3 and related materials
Zhejiang University
2014-2024
Army Medical University
2022-2024
Daping Hospital
2022-2024
Hangzhou City University
2023
City University of Seattle
2023
Nanjing University of Posts and Telecommunications
2020
Zhejiang University of Technology
2019
Hangzhou Academy of Agricultural Sciences
2016-2018
City College
2009-2018
Lawrence Berkeley National Laboratory
2017
The hot electrons in carbon-based materials exhibit interesting ballistic transport behaviors for designing high-performance single-electron transistors. However, the cooling of such back to equilibrium state may be slowed down by excessively populated optical phonons, thus limiting their transport. Therefore, a thorough understanding coupling between and phonons is critical importance. Here, varying thickness multilayer graphene film on supporting substrate, we investigated competition...
Up-conversion luminescence in rare earth ions (REs) doped nanoparticles has attracted considerable research attention for the promising applications solid-state lasers, three-dimensional displays, solar cells, biological imaging, and so forth. However, there have been no reports on REs to investigate their polarized energy transfer up-conversion, especially single particle. Herein, up-conversion from fluoride nanorods is demonstrated a particle spectroscopy mode first time. Unique...
Field effect relies on the nonlinear current-voltage relation in semiconductors; analogously, materials that respond nonlinearly to an optical field can be utilized for modulation. For instance, (NLO) bearing a saturable absorption (SA) feature on-off switching behavior at critical pumping power, thus enabling ultrafast laser pulse generation with high peak power. SA has been observed diverse preferably its nanoscale form, including both gaped semiconductor nanostructures and gapless like...
Abstract The construction of semiconductor nanocrystal (SNC)‐based composites is fundamental importance for various applications, including telecommunication, lasers, photovoltaics, and spintronics. major challenges are the intentional insertion dopants into SNCs expanding their intrinsic functionalities scalable incorporation activated host free hydroxyl organic species stabilizing integrating performances. An in situ approach presented to couple SNC doping loading processes through...
Methylammonium lead iodide (MAPbI3) perovskite has emerged as a dazzling nova in the solar cell realm. However, robustness or stability of material exposed to different ambiences is key issue. In this paper, resonance Raman spectroscopy combined with surface and bulk crystal characterizations interpret oxygen intercalation phenomenon on MAPbI3. We observe that can intercalate into frameworks MAPbI3 assistance laser excitation. By lowering down pressure experimental chamber, intercalated be...
It is demonstrated that the optical dynamics in MAPbI<sub>3</sub>is primarily determined by surface states. Pb dangling bonds MAPbI<sub>3</sub>introduce shallow electronic states, whereas rich-iodine of MAPbI<sub>3</sub>induces deep trap centers for carriers which are detrimental to carrier lifetimes and diffusion lengths.
Abstract Monochalcogenides of group IV elements have been considered as phosphorene analogs due to their similar crystal and electronic structure. Here, few‐layer SnSe nanosheets are synthesized by a sonication‐assisted liquid phase exfoliation process linear nonlinear optical properties examined. The as‐exfoliated (FL) demonstrates layer thickness from 2 10 nm lateral size 150 with high crystallinity. Optical measurement confirms the layer‐number dependent bandgap, which is also...
Self-trapped exciton emission of disphenoidal [SnCl 4 ] 2− units in the Sn( ii )-doped Cs 2 ZnCl has been studied experimentally and theoretically.
Lead toxicity is hindering the applications of conventional lead halide perovskites (PVKs), and antimony (Sb) a promising nontoxic Pb alternative, showing huge potential in optoelectronic devices. Herein, pure Mn-doped Cs3Sb2Cl9 crystals are synthesized facile route studied both experimentally theoretically. All show good crystallinity similar crystal structures, exhibiting visible photoluminescence (PL) characteristics with emission peaks at 422 613 nm, respectively. Combined density...
The lattice-structure-mismatched CdTe/PbTe heterostructures are emerging materials with unique properties and promising applications in midinfrared optoelectronics spintronics. High-density two-dimensional electron gas at the metastable twisted interfaces of (111) is investigated experimentally theoretically. CdTe thin films grown on PbTe(111) using molecular-beam epitaxy found to have high mobilities carrier concentrations from Hall-effect measurements:...
The instability of silver nanoblocks under atmospheric conditions is investigated. localized surface plasmon resonance band the shows a red shift, broadening, and damping with increasing storage time conditions. change in spectral properties considered to be due sulfidation structural breakage nanoblock based on scanning electron microscope observation numerical simulation. effect aspect ratio nanoengineered blocks also discussed.
Magnetic semiconductors based on two-dimensional (2D) crystals have attracted attention owing to their intrinsic ferromagnetism and potential for spintronic devices. Here, full-potential linearized augmented plane wave plus local orbitals method is used explore the structural, electronic, magnetic, magneto-optical properties of CrI3 monolayer. Our first-principles calculations show that monolayer a ferromagnetic indirect semiconductor with spin-up spin-down band gaps 1.23 1.90 eV,...
This work demonstrates the surface plasmon (SP)-exciton coupling effect on photoluminescence (PL) enhancement in CsPbBr3 nanocrystal (NC) at PMMA/Ag nanostructure (NS) wide spectral range excitation. The spectra dependent time resolved PL measurement reveals that emission photons are from recombination of localized excitons and can be attributed to near-field effect, which is also supported by evidence enhancements nearly same whole excitation wavelength 200 nm 900 nm. non-spectral...
We demonstrate a Faraday anomalous dispersion optical filter (FADOF) operating on 5S1/2–6P3/2 transition at 420 nm with 5 cm long cell of 96.5% enriched Rb87 and measure the transmission as function magnetic field temperature. The isotope FADOF achieves peak 98% bandwidth 2.5 GHz when temperature is 280°C 500 G. corresponding equivalent noise 5.9 GHz. applied to submarine communications, used laser frequency stabilization for some atomic lines, also pump in four-level Rb active clock.
A novel self-assembled hybrid nanocompound consisting of bismuth sulfide nanocrystals (Bi2S3 NCs) and Ag@SiO2 nanoparticles (NPs) is used to study the enhancement photoluminescence by localized surface plasmon resonance (LSPR). core-shell NPs were prepared deposition silica onto Ag through sol-gel method followed modification via 3-aminopropyltriethoxysilane for coming conjugation with Bi2S3 NCs. We propose LSPR effect adjusting thickness shell NP concentration. By modulating concentration...
Localized surface plasmon resonance coupling effects (LSPR) have attracted much attention due to their interesting properties. This Letter demonstrates significant photoluminescence (PL) enhancement in the Au NS/CH3NH3PbI3-xClx heterostructures via LSPR coupling. The observed PL emission is mainly attributed hot electron energy transfer effect related For effect, photo-generated electrons will be directly extracted into SPs, rather than relaxed exciton states. process faster diffusion and...
The electronic properties of germanium monosulphide (GeS) monolayer under tensile strain were investigated using first-principles calculations. Our computations showed that the band gap GeS was tuned from 1.96 to 2.72 eV via uniaxial and biaxial in range 10%. Besides, two transitions involving indirect direct triggered when applied 3.5 9% zigzag direction, however this transition had not happened armchair direction. variations with explained a bond nature mechanism based on Heitler–London's...
Ag/Au bimetallic nanoparticles possess the combinatory advantages of Au and Ag can also be utilized to tune properties localized surface plasmon resonance. bilayer nanorods were prepared by electron beam lithography, their spectral investigated. Compared with monolayer nanorods, show broader resonance bands, longitudinal mode transverse bands blueshift redshift, respectively. The maximum near-field intensity nanorod is less than half that without gold layer. Shape-induced modification on was...
Liquid lithium is often used as a coating material in fusion reaction chambers, where it under constant bombardment from high speed neutrons and protons. However, numerous fundamental questions are unanswered, for example whether single proton impact can cause Li atom sputtering, what the electron excitation energy profile after collision particularly extremely projectiles. Herein, we use real-time dependent density functional method to study these energies range of 30 eV 1 MeV. The...
A new model for the mechanism of photoconductivity in annealed polycrystalline PbSe fllm is presented. The combined with respect to double heterojunction due oxidation layer, dopant segregation and carrier trapping at grain-boundary proposed. This letter focuses on characterizing potential proflle, which extremely important from viewpoint transport phenomena. proflle adjacent boundaries was calculated, efiect biased voltage detail discussed, shows that mech- anism depends properties grain boundaries.