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A series of triphenylamine-functionalized phthalazinone-based covalent triazine framework materials (PHCTF-8) with high specific surface areas were successfully designed and constructed from a novel, centrosymmetric, and pinwheel-like tricyano precursor (TPAHPZ-TN) by ionothermal polymerization. The tricyano building blocks can be easily prepared by a simple and low-cost aromatic nucleophilic substitution...
In this article, the crystalline morphology of the cast film was controlled by the nucleating agent self-assembled into supramolecular structures at different temperature fields. Subsequently, the effect of crystalline morphology and orientation on porosity and uniformity of microporous membranes was investigated. The morphology of β nucleating agent (NA) networks changes from needle-like agglomerates...
Poly(imino imino ketone) (PIIK) was synthesized via palladium-catalyzed C–N cross coupling reaction of 1,4-bis-(4′-bromobenzoyl) benzene and p-phenylenediamine. In view of its good thermal stability and solubility, PIIK foams with low density between 80 mg/cm3–350 mg/cm3 have been prepared via thermal induced phase separation and freeze-drying technology. The PIIK foam possessed high glass transition...
We apply quantum-chemical techniques to investigate the structural, electronic, and optical properties of some platinum-containing fluorenyleneethynylenegermylene-derived monomers and oligomers. The aim of our quantum-chemical calculations is to investigate the role of the transition metal centers in the organometallic system in terms of electronic structure and to estimate the influence of metal...
The color purity and efficiency of polyfluorene-based blue-emitting polymers is often compromised by long wavelengths, green emission bands and the charge injection difficulties. The incorporation of the phenoxazine units has been proved to significantly enhance the hole injection and charge carrier balance and at the same time efficiently suppress the keto defect emission. In this contribution, we...
The application of polyfluorenes (PFs) in polymeric light-emitting diodes (PLEDs) has been hampered because of the charge injection difficulties and the troublesome formation of a tailed emission band at long wavelengths (>500nm) during device fabrication and operation, leading to both a color instability and reduced efficiency. The polycarbazoles have been proved to efficiently suppress the keto...
The low PL quantum efficiency, typically 1–3%, in solid film, limits the application of polythiophene and derivatives (PTs) in PLEDs. The six-member aromatic rings polyfluorenes (PFs) with higher PL efficiencies have been introduced into the backbone of PTs, in an effort to develop highly efficient, desirable charge carrier transporting and low energy gap thiophene–fluorene based light-emitting polymers...
One of the drawbacks for light-emitting diodes based on polyfluorene and derivatives (PFs) is the injection of electrons from the cathode due to the low electron affinity (EA) of most derivatives. Substitution by electron-accepting charge carriers on the conjugated polymer's backbone produces a remarkable influence on its electronic and optical properties. In this contribution, we apply quantum-chemical...
Homogeneous organic–inorganic hybrid materials with high performance were successfully prepared by mixing (3-methacryloxypropyl)trimethoxysilane (MPMS) capped acrylic resin with titania synthesized by sol–gel approaches. The effects of the titania content, the amount of water and nature of catalysts in the sol–gel as well as the ratios of mixed solvents of butyl acetate and ethanol on the structures...
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