We report the synthesis, photophysical investigation, computational studies and electroluminescent properties of a higher electron mobility organic electroluminescent material-Bis(8-hydroxyquinoline)acetylacetone alum...
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We report the synthesis, photophysical investigation, computational studies and electroluminescent properties of a higher electron mobility organic electroluminescent material-Bis(8-hydroxyquinoline)acetylacetone aluminum (Alq2 A). The complex is contrived for improving charge transport by modifying tris(8-hydroxyquinoline) aluminum(Alq3 ). Alq2 A, consisting of two 8-hydroxyquinoline ligands and one acetylacetone ligand as well as one aluminum atom, was obtained using 8-hydroxyquinoline, acetylacetone and aluminum sulfate. And it was characterized by 1 H NMR, IR and elemental analysis techniques. The absorption and fluorescence spectra of various Alq2 A systems including solution in ethanol, powder and thin film on quartz (thickness of 50nm) have also been systematically evaluated. Analysis of the electronic structure of Alq2 A calculated by quantum chemical calculations revealed a localization of orbital and the distribution of orbital energy. The results from EL experiments indicate that Alq2 A has good electron transport properties as compared with Alq3 . Thus, Alq2 A is considered to be a superior emitter and electron transporting material for display application compared with Alq3 .
The anionic polyurethane nanoparticles (APU-NPs) were obtained by an emulsion polymerization method. It was found that the average size of the prepared APU-NPs is about 84 nm, and the APU-NPs have-potential of-38.9 mV...
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A new copper(I) complex of [(POP)CuI]2[POP:bis-[2-(diphenyl phosphino)phenyl]ether] with blue emission was designed and synthesized. The molecular structure and photophysical properties of [(POP)CuI]2 were investigate...
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A new copper(I) complex of [(POP)CuI]2[POP:bis-[2-(diphenyl phosphino)phenyl]ether] with blue emission was designed and synthesized. The molecular structure and photophysical properties of [(POP)CuI]2 were investigated by FT-IR spectra, X-ray single crystal diffraction, UV-Vis absorption, emission spectra and cyclic voltammetry. The results indicate that the UV-Vis absorption peaks of [(POP)CuI]2 are located at 227, 268 and 291 nm. The blue light can be observed with a peak at 475 nm in the solid state. The HOMO, LUMO energy levels and optical gap are -6.40, -3.47 and 2.93 eV, respectively. The devices of ITO/NPB(30 nm)/CBP:[(POP)CuI]2 (30 nm, 8%)/BAlq(10 nm)/Alq3 (30 nm)/LiF(1 nm)/Al (200 nm) were fabricated by doping [(POP)CuI]2 into CBP as emitting layer with emission peak at 476 nm and maximum luminance, current efficiency of 9539 cd/m2, 1.9 cd/A.
A series of polymers were synthesized by incorporating low contents of fluorenone (FO) and 4,7-bis(2-thienyl)-2,1,3-benzothiadiazole (DBT) into the main chain of poly(9,9-dioctylfluorene).White-light emission was obta...
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A series of polymers were synthesized by incorporating low contents of fluorenone (FO) and 4,7-bis(2-thienyl)-2,1,3-benzothiadiazole (DBT) into the main chain of poly(9,9-dioctylfluorene).White-light emission was obtained from a singlepolymer by adjusting the FO and DBT *** polymers showed good thermal stability with 5% weight loss up to 410 ℃ and good solubility in common organic *** devices with indium tin oxide /poly(3,4- ethylenedioxythiophene): poly(styrenesulfonate) /emission layer /Ca /Al structure were found to emit white light with Commission Internationale de l’Eclairage coordinate of (0.37, 0.34).These devices exhibited a maxium brightness of 3414 cd/m2 and a maximum current efficiency of 2.79 cd/A.
The heterojunction composed of p-type Cu2O film and n-type ZnO nanorod arrays was fabricated by using hydrothermal method. The Cu2O film with a thickness of 1.5 μm and a preferential (111) orientation grew o...
The heterojunction composed of p-type Cu2O film and n-type ZnO nanorod arrays was fabricated by using hydrothermal method. The Cu2O film with a thickness of 1.5 μm and a preferential (111) orientation grew on the ZnO nanorod arrays with length of around 1 μm. The hydrothermal growth approach of Cu2O/ZnO heterojunction was analyzed by characterizing the samples prepared with different aging times. Typical solar cell behavior of the Cu2O/ZnO heterojunction was evaluated, with the short circuit current density (J sc) of $7.8~\mathrm{mA/cm}^{2}$ , the open circuit voltage (V oc) of 0.36 V, and the fill factor (FF) of 0.31. Owing to the large J sc of the heterojunction cell, its photovoltaic conversion efficiency (PCE) was found to be 0.86 %. This study demonstrates that the hydrothermal method is a promising technique for a large-scale fabrication of low-cost heterojunction, which is expected to have wide application in solar energy field.
We present the first report concerning the one-step synthesis of Ni/graphene nanocomposites via a substrate-free, atmospheric-pressure chemical vapor deposition process. The as-grown thin graphene sheets are produced ...
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We present the first report concerning the one-step synthesis of Ni/graphene nanocomposites via a substrate-free, atmospheric-pressure chemical vapor deposition process. The as-grown thin graphene sheets are produced in large scale with the thickness of ∼2 nm, and they are decorated with numerous Ni/graphene core–shell nanoparticles. The nucleation and growth mechanism of the composite has been proposed based on careful transmission electron microscopy analysis. Ni 3 C domains within Ni nanoparticles have been observed, indicating a transformation between nickel and nickel carbide during graphene growth owing to the diffuse and precipitation of carbon atoms. Moreover, such Ni/graphene nanocomposites exhibit excellent microwave absorption and electrochemical ethanol sensing properties. This study opens up a new synthesis route for graphene-based materials.
Carbon microspheres (CMSs) were oxidized by a mixture of concentrated sulfuric acid and nitric acid (volume ratio of 1: 3) to improve their surface activity. Then, the oxidized CMSs reacted with 1, 6-hexanediamine to ...
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Carbon microspheres (CMSs) were oxidized by a mixture of concentrated sulfuric acid and nitric acid (volume ratio of 1: 3) to improve their surface activity. Then, the oxidized CMSs reacted with 1, 6-hexanediamine to prepare aminated CMSs with N, N'-dicyclohexyl carbodiimide (DCC) as condensation agent. The influences of DCC dosage, reaction time and temperature were studied. The morphology and structure of the products were characterized by field emission scanning electron microscopy, thermogravimetry and Fourier transformation infrared spectrometry. The results showed that the preferable DCC dosage, amination time and temperature were 0.3 g, 36 h, 110°C for 0.3 g of oxidized CMSs. The surface-aminated CMSs had good dispersion in low-polar solvents i. e. ethyl acetate and chloroform, and energy levels were matchable with the most commonly used electron-donor, poly (3-hexylthiophene). The composites from the aminated CMSs and poly (3-hexylthiophene) would lay the foundation for preparation of polymer solar cells.
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