A5024763970- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Luminescence and Fluorescent Materials
- Semiconductor Lasers and Optical Devices
- Chalcogenide Semiconductor Thin Films
- Photonic and Optical Devices
- Molecular Junctions and Nanostructures
- Photochemistry and Electron Transfer Studies
- Quantum Dots Synthesis And Properties
- Nonlinear Optical Materials Studies
- Semiconductor Quantum Structures and Devices
- Advanced Fiber Laser Technologies
- Supercapacitor Materials and Fabrication
- Electrocatalysts for Energy Conversion
- Advanced Sensor and Energy Harvesting Materials
- Advanced Photocatalysis Techniques
- Advanced battery technologies research
- Thin-Film Transistor Technologies
- Synthesis and properties of polymers
- GaN-based semiconductor devices and materials
- Analytical Chemistry and Sensors
- Organic and Molecular Conductors Research
- Nanofabrication and Lithography Techniques
Nanjing University of Posts and Telecommunications
2016-2025
Royal National Orthopaedic Hospital
2025
University College London
2025
The Synergetic Innovation Center for Advanced Materials
2015-2024
Southeast University
2024
Guangdong University of Technology
2022
Nanjing University
2010-2021
South China University of Technology
2009-2021
Biosensor (Italy)
2018
Imperial College London
2005-2014
Nonradiative recombination, the main energy loss channel for open circuit voltage ( Voc), is one of crucial problems achieving high power conversion efficiency (PCE) in inverted perovskite solar cells (PSCs). Usually, grain boundary passivation considered as an effective way to reduce nonradiative recombination because defects (uncoordinated ions) on boundaries are passivated. We added hydroxyl and carbonyl functional groups containing carbon quantum dots (CQDs) into a precursor solution...
Abstract The chainmail catalyst by encapsulating an active species within the carbon support is a well‐established concept to endorse extraordinary stability for catalytic reactions under harsh conditions. Conventional catalysts inevitably suffer from poor accessibility sites, leading extra voltage compensate sluggish diffusion kinetics in electrocatalysis. Herein, naturally abundant wood material converted into monolithic electrocatalyst cobalt nanoparticles N‐doped carbonized wood. Such...
Solar-driven reduction of CO2 to valuable carbon products is an attractive pathway for energy production. The photoreduction efficiency determined by the mass transfer and charge carrier recombination efficiency. Herein, we propose a Bi2WO6–C3N4 heterojunction with hydrophobic–hydrophilic diphase promote separation. amphipathic achieved high-efficiency photocatalytic conversion into CO CH4 in H2O vapor, yielding up 25.54 7.69 μmol h–1 g–1 CH4, respectively. well-designed increased...
Abstract We report the fabrication of optically pumped solid‐state polymer lasers based on semiconducting poly(9,9‐dioctylfluorene) (PFO) using resonator structures that offer one‐ and two‐dimensional distributed feedback. The are readily fabricated by solution deposition thin films top suitable grating microstructures etched into fused silica substrates. devices operate in blue spectral region, highly efficient (slope efficiencies as high 7.8 % demonstrated), exhibit very low threshold...
High solid-state quantum efficiency (ΦPL ≈ 0.90) materials with attractive properties for OLED and laser applications are reported. Our results show that long fluorene chain-lengths not a necessary prerequisite efficient luminescence. Isolated-molecule-like emission, stable pure-deep-blue electroluminescence, low-threshold lasing (λlaser = 437 nm, Ethlaser 0.4 nJ/pulse, 1.3 µJ cm−2) demonstrated.
Rational molecular design allows for manipulating the chain conformations of polymer semiconductors by cooperative arrangement bulky groups with steric hindrance effect and supramolecular noncovalent attractions. Herein, a model polyfluorene β-phase, poly[4-(octyloxy)-9,9-diphenylfluoren-2,7-diyl]-co-[5-(octyloxy)-9,9-diphenylfluoren-2,7-diyl] (PODPF), has been synthesized successfully via key Baeyer–Villiger rearrangement reaction. Its thin film exhibited excellent spectral stability...
Abstract A series of blue (B), green (G) and red (R) light‐emitting, 9,9‐bis(4‐(2‐ethyl‐hexyloxy)phenyl)fluorene (PPF) based polymers containing a dibenzothiophene‐ S,S ‐dioxide (SO) unit (PPF‐SO polymer), with an additional benzothiadiazole (BT) (PPF‐SO‐BT polymer) or 4,7‐di(4‐hexylthien‐2‐yl)‐benzothiadiazole (DHTBT) (PPF‐SO‐DHTBT are synthesized. These exhibit high fluorescence yields good thermal stability. Light‐emitting diodes (LEDs) using PPF‐SO25, PPF‐SO15‐BT1, PPF‐SO15‐DHTBT1 as...
Abstract Nanocellulose has become an important renewable component for composite inks, owing to its desirable physical properties, reinforcing capabilities, and tunable self‐assembly behavior. However, it is difficult improve the rheological performance of nanocellulose‐based meet requirement 3D printing high resolution microarchitectures. Herein, a strategy proposed that incorporation amphiphilic molecular surfactant into nanocellulose gel can increase interaction via hydrophobic bonds...
Variable-angle spectroscopic ellipsometry (VASE) has been applied to five polyfluorene gain media. The ellipsometric data have analyzed using an electronic model based on critical points of zero dimension, i.e., exciton model. optical constants thin-film samples spectrosil B substrates deduced and are used characterize the waveguiding conditions in these asymmetric slab structures. that we leads a small correlation parameters accurate fits. good match with normal-incidence transmission...
Abstract Here, a detailed characterization of the optical gain properties sky‐blue‐light‐emitting pyrene‐cored 9,9‐dialkylfluorene starbursts is reported; it shown that these materials possess encouragingly low laser thresholds and relatively high thermal environmental stability. The exhibit solid‐state photoluminescence (PL) quantum efficiencies (>90%) near‐single‐exponential PL decay transients with excited state lifetimes ∼1.4 ns. thin‐film slab waveguide amplified spontaneous emission...
Inverted bulk heterojunction solar cells are fabricated using a conjugated polyelectrolyte (PFN) as cathode interlayer. Enhanced photovoltaic performance is achieved by adjusting the PFN thickness. Measurements of optical transmittance, work function (via UPS) and surface atomic composition XPS) provide insights into this optimization. Drift-diffusion simulations point to reduction in recombination holes at main cause for improving Voc.
We demonstrate a systematic visualization of the unique photophysical and fluorescence anisotropic properties polyfluorene coplanar conformation (β-conformation) using time-resolved scanning confocal imaging (FLIM) anisotropy microscopy (FAIM) measurements. observe inhomogeneous morphologies decay profiles at various micrometer-sized regions within all types β-conformational spin-coated films. Poly(9,9-dioctylfluorene-2,7-diyl) (PFO)...
Bulky conjugated polymers with high crystallinity is the prerequisite for overall improvement of performance in wide-bandgap semiconductors, including charge transport, photoluminescence quantum yield, processing reliability, and stability. Herein, we report a stable β-phase film bulky polydiarylfluorene (PODPF) preparing by thermal annealing at ∼220 °C. The conformation regular molecular packing are confirmed UV-vis, (PL), Raman spectra, grazing incidence X-ray diffraction (GIXD),...
We report a study of the optical gain properties three polyfluorenes with chemically tuned emission characteristics that span 400–800 nm. demonstrate low threshold light amplification in blue, green, and red spectral ranges via amplified spontaneous (ASE) optically pumped planar asymmetric waveguides. Gain loss measurements at peak ASE wavelengths show large net gains, 22⩽g⩽66 cm−1, losses, 15⩾α⩾3 cm−1. Our findings establish fluorene-based polymers as an attractive family materials for use...
We report the fabrication of optically-pumped solid-state distributed feedback lasers utilizing two blue-light-emitting semiconducting polyfluorenes as gain media. The were readily fabricated by solution deposition thin polymer films on top gratings etched into fused silica substrates. A compact Nd:YVO4 microchip laser was used pump source for polymers studied, and lasing achieved at 455 465 nm. Low threshold energies, ⩾4 nJ per pulse, obtained. emission characteristics are described along...
We report the fabrication of widely tuneable (627–702nm) optically pumped two-dimensional distributed feedback polymer lasers that utilize a red-emission fluorene copolymer as active gain medium. The exhibit efficient, low threshold operation and emit highly directional output beams result enhanced photonic confinement provided by employed resonator. Their emission operating characteristics are described in detail. demonstrate very wide spectral range (Δλ⩾75nm) over which these can be...
Abstract Soluble molecular red emitters 1a / 1b are synthesized by Stille coupling from 2‐(3,5‐di(1‐naphthyl)phenyl)thiophene precursors. The compounds show emission maxima at ca. 610 nm in CH 2 Cl solution and 620 solid films. Replacing the n ‐hexyl substituent 4‐ sec ‐butoxyphenyl produces a marked increase of glass transition temperature ( T g ) 82 °C to 137 increases solubility toluene p ‐xylene, thus improving film‐forming properties. Cyclic voltammetry shows that can be reversibly...
H-shaped oligofluorenes as gain media exhibit excellent photo- (large robustness against oxidation) and thermal stabilities in ambient atmosphere for large σe low-threshold (0.22 nJ pulse−1) deep blue distributed feedback (DFB) lasers. Their amplified spontaneous emission (ASE) thresholds increase less than 3-fold the spectra almost no shift with film samples annealed up to 200 °C open air.
The synergistic effect of the functional groups in small molecule dicyandiamide could passivate deep level defects perovskites, which can improve both efficiency and stability perovskite solar cells.
We report solid-state, optically pumped poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT), distributed feedback lasers that operate in the green-yellow spectral region, previously unaddressed with conjugated polymer gain media. The were fabricated by spin coating F8BT (the medium) onto one-dimensional gratings patterned silica substrates. emission wavelength could be selected to lie within range from 558 591 nm controlling film thickness and grating periodicity. minimum lasing threshold...