A5101431498- Luminescence Properties of Advanced Materials
- Perovskite Materials and Applications
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Mechanical and Optical Resonators
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Spectroscopy and Quantum Chemical Studies
- Plasmonic and Surface Plasmon Research
- Orbital Angular Momentum in Optics
- Nonlinear Optical Materials Studies
- Carbon Nanotubes in Composites
- Luminescence and Fluorescent Materials
- Glass properties and applications
- Advanced Photocatalysis Techniques
- Laser Material Processing Techniques
- Organic Light-Emitting Diodes Research
- Radiation Detection and Scintillator Technologies
- MXene and MAX Phase Materials
- Photonic Crystal and Fiber Optics
- Magneto-Optical Properties and Applications
- Photonic Crystals and Applications
- Solid-state spectroscopy and crystallography
Liaocheng University
2023-2025
Guangdong University of Technology
2016-2024
Zhongyuan University of Technology
2024
Nanyang Technological University
2012-2022
Division of Chemistry
2013-2020
University of Electro-Communications
2010-2014
Japan Science and Technology Agency
2011-2014
Toyoda Gosei (Japan)
2011-2014
Chungbuk National University
2009-2010
Chinese Academy of Sciences
2006-2009
Femtosecond optical pump–probe spectroscopy with 10 fs visible pulses is employed to elucidate the ultrafast carrier dynamics of few-layer MoS2. A nonthermal distribution observed immediately following photoexcitation and B excitonic transitions by ultrashort, broadband laser pulse. Carrier thermalization occurs within 20 proceeds via both carrier–carrier carrier–phonon scattering, as evidenced dependence time on density sample temperature. The n–0.37±0.03 scaling suggests that equilibration...
We report the observation of enhanced red emission at 613 nm originating from 5D0 → 7F2 transition Eu3+-doped CaMoO4 with Bi3+ as an additive, under excitation either into 5L6 state 395 or 5D2 465 nm. The luminescence properties a function and Eu3+ concentrations are studied. Strongly is obtained by adding instead increasing concentration. For fixed concentration, there optimal which maximum intensity achieved. CaMoO4:0.05Eu3+ factor 3 0.2 co-doped system, stronger than that commercial...
The thermal decomposition products and kinetics of two typical organic–inorganic halide perovskites, CH3NH3PbI3 (MAPbI3) HC(NH2)2PbI3 (FAPbI3), were investigated via simultaneous thermogravimetric analysis coupled with Fourier transform infrared spectroscopy. NH3 CH3I verified as the major gases MAPbI3. Furthermore, for first time, methane (CH4) was observed a degradation product MAPbI3 at elevated temperatures. In contrast to conventional wisdom, (HCN)3 (trimerized HCN) demonstrated gaseous...
Abstract Light‐emitting diodes (LEDs) based on lead halide perovskites demonstrate outstanding optoelectronic properties and are strong competitors for display lighting applications. While previous perovskite LEDs mainly produced via solution processing, here an all‐vacuum processing method is employed to construct CsPbBr 3 because vacuum exhibits high reliability easy integration with existing OLED facilities mass production. The high‐throughput combinatorial strategies further adopted...
We propose a method to determine the topological charge (TC) of perfect vortex. With phase shift technique, vortex and its conjugate beam exactly overlap interfere. Consequently, TC is determined by counting number interference fringes. This proposed enables in situ determination without need for additional optical elements, it immune environmental vibration parasitic interference.
Dual-mode anti-counterfeiting design based on fluorescence and afterglow.
Abstract Extending near‐infrared (NIR) spectral response and increasing ultraviolet utilization is still a challenge in the context of improving power conversion efficiency (PCE) for perovskite solar cells (PSCs). In this work, to extend NIR light‐harvesting PSCs, novel COTIC‐4F: PC 61 BM: PTB7‐Th ternary organic bulk‐heterojunction together with Au nanotriangles integrated on PSCs. The thus extended 1100 nm. fact, layer enables multi‐functional effects, which can serve as electron...
Abstract We report on a novel optical vortex array named circular array, which is generated by the superposition of two concentric perfect vortices. The has constant topological charge +1 or −1, number and sign are determined charges Moreover, radius easily adjusted using cone angle an axicon. Furthermore, multiple can be rotated changing initial phase difference vortices demand. This work demonstrates complex structured field, significance for applications such as tweezers, micro‐particle...
Femtosecond optical pump–probe spectroscopy is employed to elucidate the band-selective ultrafast carrier dynamics of few-layer MoS2. Following narrowband resonant photoexcitation exciton A transition, subpicosecond picosecond relaxation electron and hole at K valley are separately interrogated by a broadband probe pulse. The temporal evolution spectral first moment reveals nonexponential intravalley in conduction band. Fluence dependence measurements suggest that this process predominantly...
Ferroelectrics have recently attracted attention as a candidate class of materials for use in photovoltaic devices due to their abnormal effect. However, the current reported efficiency is still low. Hence, it urgent develop narrow-band gap ferroelectric with strong ferroelectricity by low-temperature synthesis. In this paper, perovskite bismuth ferrite BiFeO3 (BFO) thin films were fabricated on SnO2: F (FTO) substrates sol-gel method and they rapidly annealed at 450, 500 550 °C,...
The red photoluminescence and phosphorescence originating from D21-H43 transition of Pr3+ in CaTiO3 nanoparticles are studied as a function concentrations. nanophosphors exhibit both longer persistence time 30min higher quenching concentration 0.4mol% than the bulk (10min 0.1mol%). initial nanophosphor is an order magnitude stronger that at corresponding Phosphorescence decay patterns diffused reflectance spectra before after ultraviolet exposure indicate existence more traps contributing to...
The ionization of liquid water functions as the principal trigger for a myriad phenomena that are relevant to radiation chemistry and biology. earliest events follow water, however, remain relatively unknown. Here, femtosecond coherence spectroscopy is combined with polarization anisotropy measurements elucidate ultrafast electron ion dynamics in ionized water. results show strong-field produces an aligned p distribution. Furthermore, oscillations observed suggestive valence motion highly...
Ultrafast sub-ps hot carrier relaxation followed by subsequent ps transport from layered 2D to 3D-like perovskite phases is demonstrated.
<italic>In situ</italic> cross-linking passivation strategy for high-quality perovskite nanoplatelets with unity photoluminescence quantum yield.
In-volume, self-assembled, three-dimensional, periodic micro-nano structures are induced in quartz crystal by tightly focused, 500-kHz femtosecond laser pulses. With suitable pulse energy, three different types of can be observed modified regions using scanning electron microscopy. The first one with period (ΛE) ~400 nm the direction polarization, i.e. nanograting, shows indicative features similar to that fused silica. second (ΛS) scan and third (Λk) propagation both equally spaced ~1 μm,...