A5101449771- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Luminescence and Fluorescent Materials
- Organic Electronics and Photovoltaics
- Crystallography and molecular interactions
- Synthesis and Properties of Aromatic Compounds
- Organic Light-Emitting Diodes Research
- Molecular Junctions and Nanostructures
- Supramolecular Self-Assembly in Materials
- Conducting polymers and applications
- Perovskite Materials and Applications
- Porphyrin and Phthalocyanine Chemistry
- TiO2 Photocatalysis and Solar Cells
- Organoboron and organosilicon chemistry
- Surface Chemistry and Catalysis
- Advanced Photocatalysis Techniques
- Nonlinear Optical Materials Studies
- Machine Learning in Materials Science
- Bone and Dental Protein Studies
- Computational Drug Discovery Methods
- Supramolecular Chemistry and Complexes
- University-Industry-Government Innovation Models
- Synthesis of Indole Derivatives
- Force Microscopy Techniques and Applications
- Chemical Synthesis and Analysis
East China University of Science and Technology
2018-2023
The University of Tokyo
2015-2021
Beijing National Laboratory for Molecular Sciences
2008-2015
Peking University
2009-2015
Ministry of Education
2014-2015
Centre for Nano and Soft Matter Sciences
2015
South China University of Technology
2008
University of California, San Francisco
2005-2007
An average PCE of 4.2% for all-polymer solar cells from 20 devices with an J SC 8.8 mA cm−2 are obtained a donor-acceptor pair despite low LUMO-LUMO energy offset less than 0.1 eV. Incorporation polystyrene side chains into the donor polymer is found to assist in reducing phase separation domain length scale, and results more 20% enhancement PCE. We observe direct correlation between short circuit current (J SC) scale BHJ separation, which by resonance soft X-ray scattering. The performance...
A series of PDI dimers featuring various arylene linkers are developed as electron acceptors in organic solar cells. Using P3HT the donor, power conversion efficiency up to 2.3% is achieved with two having spirobifluorene linkers. The results indicate that such non-planar, three-dimensional structures effectively suppress self-aggregation and crystallization units, which favourable for their cell performance.
Completely understanding the working mechanisms of sophisticated supramolecular self-assembly exhibiting competing paths is very important for chemists en route to acquiring ability constructing systems with controlled structures and designed functions. Here, self-aggregation behaviors an N-heterocyclic aromatic dicarboximide molecule 1, boasting two that give rise different exhibit distinct thermodynamic features, are carefully examined. First, a group H-aggregates observed when providing...
Abstract Thin film organic lasers represent a new generation of inexpensive, mechanically flexible devices for spectroscopy, optical communications and sensing. For this purpose, it is desired to develop highly efficient, stable, wavelength-tunable solution-processable laser materials. Here we report that carbon-bridged oligo( p -phenylenevinylene)s serve as optimal materials combining all these properties simultaneously at the level required applications by demonstrating amplified...
Two polymers, r-PDI-diTh and i-PDI-diTh, were synthesized as acceptors applicable for solution-processed BHJ OSCs. By introducing a bulky, dove tailed side chain thereby suppressing the π–π interactions between perylenediimide units in backbones of acceptor more effective phase segregation these with donor polymer (P3HT) was realized. employing inverted device configuration to better match vertical separation donor–acceptor polymers produced by solution processing, undesirable polaron pair...
A new family of air-stable sulfur-hetero oligoarenes based on the benzo[k]fluoranthene unit has been facilely developed as active materials for thin film organic field-effect transistors. The Diels-Alder reaction between cyclopentadienone 1 and 2,2'-(ethyne-1,2-diyl)bisthiophene followed by decarbonylation afforded fluoranthene derivative 2. After bromination subsequent substitution through Suzuki coupling reaction, FeCl3-oxidative cyclization produced derivatives 8-12. In dilute chloroform...
Dimeric and trimeric molecules comprising perylenediimide units conjugatively linked by phenylene, ethynylene, or a butadiynylene spacer via the bay positions were prepared. Electrochemical photophysical characterizations showed that oligomers connected C−C triple bond(s) exhibited effectively lowered LUMO compared to monomer. Molecular modeling confirmed bond realized efficient delocalization of frontier orbitals, while phenylene was less competent in extending conjugation, partially due...
A series of dihydro- and tetrahydro-tetraazaacene diimides containing 6 or 7 laterally fused six-membered rings were synthesized. Halochromic redox-switchable vis-NIR optical characteristics exhibited. Quinonoid tautomers dihydrotetraazaacene derivatives obtained characterized, which exhibited adequate stability existed in equilibrium with the more commonly observed benzenoid tautomer.
To fabricate efficient dye-sensitized solar cells (DSSCs), 4-tert-butylpyridine (TBP) is commonly used as an additive in the electrolytes for improving photovoltages (VOC). However, TBP cannot play a positive role photocurrent (JSC) because of lack absorption visible-wavelength range. We herein report light-absorbing pyridine derivative N1 axial coordination with porphyrin dyes. was synthesized by introducing (bis(4-methoxyphenyl)amino)anthryl moiety into para-position via acetylene bridge,...
We have used Raman spectroscopy to study the molecular and electronic structures of radical cations dications carbon-bridged oligo(para-phenylenevinylene)s (COPVn, n = 1-6) possessing consecutive fused pentagons hexagons, up 19, along with COPV derivatives having electron-donating -withdrawing groups. This was made possible by outstanding stability charged states COPVs. could untangle effects π-conjugation in planar structure on frequency distinguishing it from other structural effects, such...
Fluorosed enamel is caused by exposure to fluoride during tooth formation. The objective of this study was determine whether epithelial ameloblast-lineage cells, derived from the human organ, are directly affected micromolar concentrations fluoride. Cells were cultured in presence fluoride, and proliferation measured BrdU incorporation. effect 0, 10, or 20 μM on apoptosis determined flow cytometry apoptotic index. effects gene expression investigated SuperArray microarray analysis real-time...
Crystalline microwires of a phenyleneethynylene (PE) macrocycle self-assembled from solution exhibited superior photoconductive properties. Photoswitches fabricated with single wires afforded nA-scale photocurrents on/off ratios ca. 10(3). At bias 30 volts highest gain value achieved was up to 4.5. The stable and rapid responses light qualify these microwire-based devices for excellent photoswitches or photodetectors.
Two water-soluble triscyclometalated organoiridium complexes, 1 and 2, with polar side chains that form nanoparticles emitting bright-red phosphorescence in water were synthesized. The optimal properties are related to both the structure nanoparticle-forming ability aqueous solution. Nonlinear optical also observed nanoparticles. Because of their proper cellular uptake addition high emission brightness effective two-photon absorbing ability, cell imaging can be achieved 2 bearing quaternary...
Stabilization of the radical cationic state a donor molecule by 3-D homoconjugation was probed using substituted carbon-bridged oligophenylenevinylene backbone (COPV, or 5,5-diarylindeno[2,1-a]indenes). For molecules bearing electron-donating groups as 5,5-aryl moieties, one-electron oxidation COPV results in delocalization charge over whole with small reorganization energy. The compounds forming stable cation produce uniform amorphous film and show high short-circuit current, fill factor,...
Arylene ethynylene macrocycles containing 9,10-anthrylene or 1,4-naphthylene units were synthesized. In chloroform, significant resonance upfield shifting was observed with β-protons of anthrylene and naphthylene in NMR spectra. This considered to result from partial stacking these aromatic intramolecularly, driven by attractive π−π interactions. DFT calculations supported the proposed intramolecular motif. Moreover, a liquid-crystal phase exhibited anthrylene-containing macrocycle, virtue...
Abstract A series of conjugated oligo( p ‐phenylene‐ethynylene) (OPE) molecules with backbone conformations (that is, the relative orientations contained phenylene units) controlled by competitive intramolecular hydrogen bonds to be either co‐planar or random were synthesised and studied. In these oligomers, carboxylate amido substituents attached alternate units in OPE backbone. These functional groups able form between neighbouring units. Thereby, all confined a conformation. This...
The cycloaddition of azides and alkynes in the solid state was accelerated by high pressure. In situ Raman scattering synchrotron X-ray diffraction were employed to study reaction kinetics at different pressures which revealed that pressure acceleration originates from elevated substrate energy decreased activation energy.
Treating diethynyl-substituted perylenediimides with ICl successfully induced an annulation reaction and generated a series of coronenediimide derivatives. Instead the expected iodine-substituted cyclization product, chlorine-substituted analogues were produced. The mechanism this thus necessarily involved chlorine addition step prior to aromatic substitution reaction. With facile subsequent transformations, various tetraaryl coronenediimides could be obtained via annulated...
An effective method was developed to prepare triphenyleno[1,2,3,4-ghi]perylenediimide derivatives, via ICl-induced annulation, dehalogenation, followed by photocyclization. A perylenediimide (PDI) dimer featuring a terphenyl bisethynylene linker thereby transformed into benzo[k]tetraphene fused with two benzoperylenediimides. These PDI derivatives exhibited electron mobility up 0.079 cm2 V−1 s−1 in solution-processed thin film transistors.
The photophysical properties of a series tris-cyclometalated Ir(III) complexes bearing oligofluorene-substituted 2-phenylpyridine (ppy) and/or 1-phenylisoquinoline (piq) ligands were studied at both room temperature and 77 K, for delineating the oligomer-substitution effects on photophysics in such metal-complex-containing conjugated oligomers/polymers. Unique dependence was observed with triplet excited-state lifetime oligomers. Molecules having one three ppy substituted an oligofluorenyl...
Perylenediimide oligomers comprising different linkers exhibit J- and H-aggregates, which is proposed to arise from subtle supramolecular structure differences.
Tetracyano- and tetrachlorocoronene diimides with low LUMO levels are developed, exhibiting electron mobilities of up to 0.16 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> in solution-processed OFETs.