A5066514515- Perovskite Materials and Applications
- Luminescence and Fluorescent Materials
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Photonic and Optical Devices
- Organic Light-Emitting Diodes Research
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Photonic Crystals and Applications
- Semiconductor Quantum Structures and Devices
- Chalcogenide Semiconductor Thin Films
- ZnO doping and properties
- Synthesis and Properties of Aromatic Compounds
- Nanowire Synthesis and Applications
- Molecular Sensors and Ion Detection
- GaN-based semiconductor devices and materials
- Photorefractive and Nonlinear Optics
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Nanoplatforms for cancer theranostics
- Ga2O3 and related materials
- Polydiacetylene-based materials and applications
- Solid-state spectroscopy and crystallography
- Supramolecular Self-Assembly in Materials
Hong Kong University of Science and Technology
2016-2025
University of Hong Kong
2016-2025
Kowloon Hospital
2014-2021
Institute for Advanced Reconstruction
2020
Shandong University
2005-2020
South China University of Technology
2020
HKUST Shenzhen Research Institute
2020
Guangzhou University of Chinese Medicine
2020
State Key Laboratory of Crystal Materials
2020
Huaiyin Institute of Technology
2020
Boron dipyrromethene (BODIPY) derivatives 1 and 2 consisting of donor acceptor units with dual photoresponses to solvent polarity luminogen aggregation are developed through taking advantage twisted intramolecular charge transfer (TICT) aggregation-induced emission (AIE) processes. In nonpolar solvents, the locally excited (LE) states BODIPY luminogens emit intense green lights. Increasing brings from LE state TICT state, causing a large bathochromic shift in color but dramatic decrease...
Defects in three different types of ZnO nanostructures before and after annealing under conditions were studied. The atmosphere temperature found to strongly affect the yellow orange-red defect emissions, while green emission was not significantly affected by annealing. emissions exhibited a strong dependence on excitation wavelength, with some observable only at low temperatures for certain wavelengths. samples prepared hydrothermal method is likely due presence OH groups, instead commonly...
Abstract A major challenge for organic solar cell (OSC) research is how to minimize the tradeoff between voltage loss and charge generation. In early 2019, we reported a non-fullerene acceptor (named Y6) that can simultaneously achieve high external quantum efficiency low OSC. Here, use combination of experimental theoretical modeling reveal structure-property-performance relationships this state-of-the-art OSC system. We find distinctive π–π molecular packing Y6 not only exists in single...
Recently, researchers have focused on the design of highly efficient flexible perovskite solar cells (PVSCs), which enables implementation portable and roll-to-roll fabrication in large scale. While NiOx is a promising material for hole transport layer (HTL) candidate fabricating PVSCs rigid substrate, reported HTLs are formed using different multistep treatments (such as 300–500 °C annealing, O2-plasma, UVO, etc.), hinders development based NiOx. Meanwhile, features nanostructured...
A novel AIEgen with prominent two-photon excitation was rationally developed for specific lipid-droplet imaging in cells and tissues.
Turning "stone" into "gold": pyrene, a faint fluorophore in the solid state, is transformed bright emitter by decorating it with tetraphenylethene units; new luminogen thermally and morphologically stable its light-emitting diode shows excellent performance, external quantum efficiency current up to 4.95% 12.3 cd A(-1), respectively.
In this contribution, we conceptually present a new avenue to construction of molecular functional materials with high performance circularly polarised luminescence (CPL) in the condensed phase. A molecule (1) containing luminogenic silole and chiral sugar moieties was synthesized thoroughly characterized. solution 1, no circular dichroism (CD) fluorescence emission are observed, but upon aggregation, both CD simultaneously turned on, showing aggregation-induced (AICD) (AIE) effects. The...
We synthesized a group of silole regioisomers 1x,y, whose photoluminescence varied dramatically with its regiostructure. By internally hindering the intramolecular rotation, we succeeded in creating novel (13,4) that is strongly luminescent solutions and fluorescence quantum yield acetone as high 83%. revealed 13,4 was sensitive chemosensor capable optically discriminating nitroaromatic p-, o-, m-nitroanilines. Against general belief, crystal formation 12,4 blue-shifted emission color...
NiO is a promising hole transporting material for perovskite solar cells due to its high mobility, good stability, easy processibility, and suitable Fermi level extraction. However, the efficiency of NiO‐based still limited by slow extraction poor perovskite/NiO interface inadequate quality two solution‐processed phases. Here, large influences monolayer surface modification nanocrystal layers with ethanolamine molecules are demonstrated on enhancement extraction/transport thus photovoltaic...
Solar cells incorporating lead halide-based perovskite absorbers can exhibit impressive power conversion efficiencies (PCEs), recently surpassing 15%. Despite rapid developments, achieving precise control over the morphologies of films (minimizing pore formation) and enhanced stability reproducibility devices remain challenging, both which are necessary for further advancements. Here we demonstrate vacuum-assisted thermal annealing as an effective means controlling composition morphology...
Carbon‐based hole transport material (HTM)‐free perovskite solar cells (PSCs) have shown much promise for practical applications because of their high stability and low cost. However, the efficiencies this kind PSCs are still relatively low, especially simplest paintable carbon‐based PSCs, in comparison with organic HTM‐based PSCs. This can be imputed to deposition methods that not very suitable devices. A solvent engineering strategy based on two‐step sequential method is exploited prepare...
Far-red and near-infrared (NIR) fluorescent materials possessing the characteristics of strong two-photon absorption aggregation-induced emission (AIE) as well specific targeting capability are much-sought-after for bioimaging therapeutic applications due to their deep penetration depth high resolution. Herein, a series dipolar far-red NIR AIE luminogens with push-pull effect designed synthesized. The obtained fluorophores display bright solid-state fluorescence quantum yield up 30%, large...
Fluorescence of a hyperbranched poly(silylenephenylene) is weakened with increasing quencher concentration in an exponential fashion, giving extremely high quenching constant and making the polymer highly sensitive chemosensor for explosive detection.
Circularly-polarized luminescence (CPL) has received new attention on the rise of applications to generate devices and biologically active probes. These require fluorophores that are not only chiral but also provide strong fluorescence intensity in aggregated state. Thus, a research branch opened up few years ago, which allows CPL-active be emissive aggregated-state. As result, reports combination CPL property with aggregation-induced emission (AIE) phenomenon have emerged. Herein early...
We have studied the photocatalytic activity of ZnO tetrapods, powder, and different nanoparticles. While nanoparticles with small particle size exhibited higher Brunauer–Emmett–Teller (BET) surface area, tetrapods significantly for degradation dyes. Degradation four dyes has been achieved at least 5 times shorter time compared to (20 nm average size). Different samples characterized by variable-temperature photoluminescence time-resolved measurements, relationship between optical properties,...
π-Bonds connected with aromatic rings were generally believed as the standard structures for constructing highly efficient fluorophores. Materials without these typical structures, however, exhibited only low fluorescence quantum yields and emitted in ultraviolet spectral region. In this work, three molecules, namely bis(2,4,5-trimethylphenyl)methane, 1,1,2,2-tetrakis(2,4,5-trimethylphenyl)ethane, 1,1,2,2-tetraphenylethane, nonconjugated isolated phenyl synthesized their photophysical...
The photovoltaic performance of perovskite solar cells (PVSCs) is extremely dependent on the morphology and crystallization film, which affected by deposition method. In this work, a new approach demonstrated for forming PbI 2 nanostructure use high CH 3 NH I concentration are adopted to form high‐quality (smooth residue‐free) film with better performances. On one hand, self‐assembled porous formed incorporating small amount rationally chosen additives into precursor solutions, significantly...
Abstract While there has been extensive investigation into modulating quasi‐2D perovskite compositions in light‐emitting diodes (LEDs) for promoting their electroluminescence, very few reports have studied approaches involving enhancement of the energy transfer between layers film, which plays important role achieving high‐performance LEDs (PeLEDs). In this work, a bifunctional ligand 4‐(2‐aminoethyl)benzoic acid (ABA) cation is strategically introduced to diminish weak van der Waals gap...
A series of tetraphenylethene-containing BODIPYs with emissions from visible to near-IR and large Stokes shifts up 142 nm have been designed synthesized. They show solvatochromic fluorescence can be utilized as fluorescent visualizers for intracellular imaging.
Compared to the conventional perovskite solar cells (PSCs) containing hole-transport materials (HTM), carbon based HTM-free PSCs (C-PSCs) have often suffered from inferior power conversion efficiencies (PCEs) arising at least partially inefficient hole extraction perovskite–carbon interface. Here, we show that boron (B) doping of multiwalled nanotubes (B-MWNTs) electrodes are superior in enabling enhanced and transport by increasing work function, carrier concentration, conductivity MWNTs....
Regulating side-chain orientations of Y-series NFAs is a promising strategy to achieve favorable morphology, and high charge mobility solar cell performances, which enables high-performance devices with efficiency approaching 18%.
In this work, a heteroatom-containing luminogen (TPE-Py) with multi-functionalities was synthesized in reasonable yield by melding pyridinium unit tetraphenylethene through vinyl functionality. TPE-Py is weakly emissive solution but becomes strong emitter when aggregated as nanoparticle suspensions poor solvents or the solid state, displaying phenomenon of aggregation-induced emission. Crystallization generally weakens and red-shifts light The crystalline aggregates TPE-Py, however, emit...
Abstract Because of their innate ability to store and then release energy, long‐persistent luminescence (LPL) materials have garnered strong research interest in a wide range multidisciplinary fields, such as biomedical sciences, theranostics, photonic devices. Although many inorganic LPL systems with afterglow durations up hours days been reported, organic had difficulties reaching similar timescales. In this work, design principle based on the successes produce an (OLPL) system through use...