A5101821905- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Analytical chemistry methods development
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Advanced Fiber Laser Technologies
- Spectroscopy and Quantum Chemical Studies
- Mercury impact and mitigation studies
- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Laser Material Processing Techniques
- Cultural Heritage Materials Analysis
- Spectroscopy and Laser Applications
- Quantum Dots Synthesis And Properties
- Photochemistry and Electron Transfer Studies
- Luminescence and Fluorescent Materials
- Graphene research and applications
- Perovskite Materials and Applications
- Nanocluster Synthesis and Applications
- Quantum, superfluid, helium dynamics
- Diamond and Carbon-based Materials Research
- Molecular Spectroscopy and Structure
- Carbon and Quantum Dots Applications
- Atmospheric Ozone and Climate
- Laser-Plasma Interactions and Diagnostics
Jilin University
2016-2025
Jilin Medical University
2009-2025
Chengdu Third People's Hospital
2023
Chinese Academy of Sciences
2013-2022
Shanghai Institute of Optics and Fine Mechanics
2022
Space Engineering University
2021
Dalian Institute of Chemical Physics
2018
State Key Laboratory of Molecular Reaction Dynamics
2018
Jiangnan University
2018
Changchun Institute of Optics, Fine Mechanics and Physics
2013-2017
Carbon quantum dots (CQDs) have emerged as promising materials for optoelectronic applications on account of carbon's intrinsic merits high stability, low cost, and environment-friendliness. However, the CQDs usually give broad emission with full width at half maximum exceeding 80 nm, which fundamentally limit their display applications. Here we demonstrate multicolored narrow bandwidth (full 30 nm) from triangular a yield up to 54-72%. Detailed structural optical characterizations together...
Near-infrared-emissive polymer-carbon nanodots (PCNDs) are fabricated by a newly developed facile, high-output strategy. The PCNDs emit at wavelength of 710 nm with quantum yield 26.28%, which is promising for deep biological imaging and luminescent devices. Moreover, the possess two-photon fluorescence; in vivo bioimaging red-light-emitting diodes based on these demonstrated.
Abstract Piezochromic materials, which show color changes resulting from mechanical grinding or external pressure, can be used as mechanosensors, indicators of mechano‐history, security papers, optoelectronic devices, and data storage systems. A class piezochromic materials with unprecedented two‐photon absorptive yellow emissive carbon dots (CDs) was developed for the first time. Applied pressure 0–22.84 GPa caused a noticeable change in luminescence CDs, shifting (557 nm) to blue‐green...
Abstract Two molecules, 1-hydroxypyrene-2-carbaldehyde (HP) and 1-methoxypyrene-2-carbaldehyde (MP) were explored. We investigated their photophysical properties, using experimental transient absorption theoretical density functional theory/time-dependent theory (DFT/TDDFT). HP MP have similar geometric conformations but exhibit entirely different properties upon excitation into the S 1 state. In contrast to traditional excited state intramolecular proton transfer (ESIPT) in molecules that...
The twisted intramolecular charge transfer (TICT) state plays an important role in determining the performance of optoelectronic devices. However, for some nonfluorescent TICT molecules, "invisible" could only be visualized by modifying molecular structure. Here, we introduce a new facile pressure-induced approach to light up through use pressure-related liquid-solid phase transition surrounding solvent. Combining ultrafast spectroscopy and quantum chemical calculations, it reveals that can...
The multiple proton transfer reactions of 3-hydroxypyridine-(H<sub>2</sub>O)<sub>3</sub>have been demonstrated, and a perfect cycle has revealed in the ground excited states.
Abstract Piezochromic materials, which show color changes resulting from mechanical grinding or external pressure, can be used as mechanosensors, indicators of mechano‐history, security papers, optoelectronic devices, and data storage systems. A class piezochromic materials with unprecedented two‐photon absorptive yellow emissive carbon dots (CDs) was developed for the first time. Applied pressure 0–22.84 GPa caused a noticeable change in luminescence CDs, shifting (557 nm) to blue‐green...
The effect of hydrogen bonding on the intermolecular photoinduced ICT and TICT processes for coumarin 500 has been demonstrated, a reliable mechanism revealed to explain unusual behavior C500 in dioxane methanol.
Ultrafast carrier relaxation dynamics in fluorescent carbon nanodots is investigated by femtosecond transient absorption spectra at different pH environments so as to understand the mechanism of fluorescence for first time. Utilizing multi-wavelength global analysis fit measured signal via a sequential model, four channels are found, which attributed electron-electron scattering and surface state trapping, optical phonon scattering, acoustic electron-hole recombination respectively. The...
Raman spectra of single-walled carbon nanotubes (SWNTs) with diameters 0.6--1.3 nm have been studied under high pressure. A ``plateau'' in the pressure dependence $G$-band frequencies was observed all experiments, both and without transmission medium. Near onset plateau, corresponding radial breathing mode (RBM) lines become very weak. strong broadening full width at half maximum RBMs just before plateau suggests that a structural transition starts SWNTs. from SWNTs released different...
It is generally believed that the bandgap of graphene oxide proportional to concentration oxygen atoms and a highly reduced (rGO) without vacancy defects should be gapless. We show here from first principles calculations can effectively opened even in low oxidation level with absorption either symmetrically or asymmetrically. The properly arranged induce up 1.19 eV for C/O ratio 16/1 symmetric system 1.58 32/3 an asymmetric system, at generalized gradient approximation (GGA) level....
Laser-induced breakdown spectroscopy is performed through the collection of spectra by spectral detection equipment at different delay times and distances from targets composed Cu nano-Cu, which are ablated using a Nd:YAG laser (532 nm, 10 ns, Hz) in our experiments. The measured wavelength range 475 nm to 525 nm. Using local thermodynamic equilibrium model, we analyze characteristics plasma temperature electron number density for between target surface lens. results show that when compared...
Enhancement of laser-induced Fe plasma spectroscopy with dual-wavelength is investigated by using femtosecond double-pulse laser.
Rydberg-state excitation of atoms in strong infrared laser fields provides a new complementary aspect the perspective atom--strong field interactions. In this article, we perform an experimental and theoretical study on corresponding process diatomic molecules, ${\mathrm{N}}_{2}$ ${\mathrm{O}}_{2}$. We show that neutral molecules can also survive 800-nm high Rydberg states, while their behavior is remarkably different comparison with companion atoms, Ar Xe. The generally behaves similarly to...
In this study, the influence of distance between focusing lens and target surface on plasma temperature copper induced by a Nd:YAG laser was investigated in atmosphere. The calculated using Cu (I) lines (510.55 nm, 515.32 521.82 nm). were recorded under different lens-to-sample distances pulse energies (15.8 mJ, 27.0 43.4 59.2 76.8 mJ). results indicated that depended strongly surface. With increase distance, firstly rose, then dropped. This could be attributed to interaction tailing...
Electron transfer (ET) and Auger recombination (AR) processes in quantum dots (QDs) are key mechanisms for the advance of QD-based devices. However, it still remains a challenge to promote ET suppress AR simultaneously. Here, we use situ high-pressure ultrafast transient absorption spectroscopy explore impact pressure on between CdSe/ZnS anthraquinone (AQ) dissolved cyclohexane. Remarkably, under compression, lifetimes shorten, while suppression is present. The promotion attributed shortened...
The influence of substrate temperature on the detection sensitivity surface-enhanced (SE) LIBS for analysis heavy metal elements in water is investigated; increasing can improve SE-LIBS.