- Photophysical properties of octupolar chromophore based on triazine core and fluorene divinylene conjugated bridge
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A novel octupolar chromophore with 1,3,5-triazine as core, 2,7-divinylene-9,9-dimethylfluorene as extended π-conjugated bridge, triarylamine as the electron-donating end-groups was successfully synthesized and characterized. Their linear photophysical and two-photon absorption (TPA) properties were investigated by UV absorption, excited fluorescence (SPEF) spectra and nonlinear transmission method, respectively. The absorption cut-off of the chromophore is below 520 nm and it has stronger fluorescence emission in a nonpolar solvent. In addition, the chromophore exhibits larger TPA cross-section (226.0 GM) in the femtosecond regime at 800 nm.
- Wei, Li,Shi, Jie Ping,Zhou, Zhi Qiang,Cui, Yi Ping,Hu, Hong Wen,Lu, Guo Yuan
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- Optical and electrical properties of electrochromic devices depending on electrolyte concentrations and cell gaps
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The optical and electrical properties of electrochromic devices (ECDs) have been studied as a function of the electrolyte concentration and the cell gap. During tests, the electrolyte concentration was adjusted from 0.01 to 1 M LiClO4, and the cell gaps between the positive and negative electrodes were set at 25, 60, and 100 μm. By varying the electrolyte concentrations and the cell gap, various parameters such as the transmittance, response time, charge consumption, coloration efficiency, and bistability of ECD were comparatively analyzed. Viologen (VO) was used as the reduction electrochromic material, and triarylamine (TAA) was used as the oxidation material.
- Ah, Chil Seong,Song, Juhee,Cho, Seong Mok,Kim, Tae-Youb,Ryu, Hojun,Cheon, Sanghoon,Kim, Joo Yeon,Hwang, Chi-Sun,Kim, Yong-Hae
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- Photosensitive dye taking carbazole and triphenylamine as D-D-π-A structure of two-stage electron donor as well as preparation method and application thereof (by machine translation)
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The invention belongs to the field of solar cells and discloses a photosensitive dye taking carbazole and triphenylamine as a two-stage electron donor and D-D-π-A structure as well as a preparation method and application of the photosensitive dye as a π conjugated bridge. The preparation method is simple, the process is easy to control, the raw material source is wide, the price is low, the prepared photosensitive dye is high in purity, high in yield and suitable for industrial production. The photosensitive dye is used for preparing a photo-sensitized solar cell. (by machine translation)
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- D-D-pi-A structured photosensitive dye using carbazole and triphenylamine as two-stage electron donors, and preparation method and application thereof
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The invention discloses a D-D-pi-A structured photosensitive dye using carbazole and triphenylamine as two-stage electron donors. The photosensitive dye uses triphenylamine and carbazole as electron donors, 3,4-ethylenedioxythiophene or thiophene as a pi conjugated bridge and cyanoacetic acid as an electron acceptor. The invention also provides a preparation method of the photosensitive dye, and an application of the photosensitive dye in dye-sensitized solar cells. The photosensitive dye has various structures, and has a photoelectric conversion efficiency reaching up to 6%, and the preparation method has the advantages of simplicity, easiness in process control, low cost, and friendliness to the environment. The preparation method is suitable for preparing the D-D-pi-A structured photosensitive dye using carbazole and triphenylamine as two-stage electron donors, and the prepared photosensitive dye is suitable for being applied to the dye-sensitized solar cells.
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- Novel preparation method of sulfonium salt derivatives with stilbene as conjugated system
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The invention provides a novel preparation method of sulfonium salt derivatives with stilbene as a conjugated system. The method comprises steps as follows: firstly, benzyl halides (Hal denotes halogen atom) substituted with different groups react with organic phosphate, a product reacts with benzaldehyde substituted with different sulfydryl under the alkaline condition, a high-yield disubstituted stilbene intermediate shown in (I)-a is prepared, and finally, the intermediate shown in (I)-a produces final sulfonium salt under the action of silver salt and alkyl halide or silver salt and alkyl acid ester; when different negative ions are required to be replaced, a salt exchange method is adopted to realize replacement. The provided scheme has the benefits, as examples but not confined, as follows: no noble metal catalyst is required, the raw materials are easy to obtain, and the cost is low; the reaction is performed at the room temperature, operation is simple and purification is convenient; favorable conditions are provided for large-scale industrial production of the sulfonium salt derivatives with stilbene as the conjugated system.
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- Lewis acid-mediated Michaelis-Arbuzov reaction at room temperature: A facile preparation of arylmethyl/heteroarylmethyl phosphonates
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A facile preparation of arylmethyl and heteroarylmethyl phosphonate esters was achieved involving a Lewis acid mediated Michaelis-Arbuzov reaction at room temperature. Interaction of arylmethyl halides/alcohols with triethyl phosphite in the presence of Lewis acid at room temperature afforded phosphonate esters in good yields.
- Rajeshwaran, Ganesan Gobi,Nandakumar, Meganathan,Sureshbabu, Radhakrishnan,Mohanakrishnan, Arasambattu K
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supporting information; experimental part
p. 1270 - 1273
(2011/04/23)
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- NOVEL ORGANIC ELECTROLUMINESCENT COMPOUNDS AND ORGANIC ELECTROLUMINESCENT DEVICE USING THE SAME
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Disclosed are novel organic electroluminescent compounds and organic electroluminescent devices including the same. Since the organic electroluminescent compounds according to the present invention exhibit high luminescence efficiency and excellent color purity and life property, they may be used to manufacture OLEDs with very good operation life.
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Page/Page column 16
(2010/11/17)
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- Porphyrins with enhanced multi-photon absorption cross-sections for photodynamic therapy
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A method of increasing the multi-photon absorption cross-section of a porphyrin-based photosensitizer by attaching at least one TPA-chromophore at the meso- or beta-positions of a porphyrin structure of the porphyrin-based photosensitizer, and at least on
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- A convenient method for the synthesis of electron-rich phosphonates
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Very electron-rich benzylic-type phosphonates can be prepared by treating the corresponding alcohols in triethyl phosphite with one equivalent of iodine at an appropriate temperature in a general one-pot process.
- Zheng, Shijun,Barlow, Stephen,Parker, Timothy C.,Marder, Seth R.
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p. 7989 - 7992
(2007/10/03)
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- Stilbeneamine derivative and electrophotosensitive material using the same
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The present invention relates to a stilbeneamine derivative represented by a formula (1) : wherein Ar1 and Ar2 each denote an aryl group; Ar3 denotes an arylene group; Ar4 denotes an arylene group or divalent heterocyclic group; provided that when a thiophene ring in the formula is 2-thiophenyl, 'n' is 1 and when the thiophene ring is 3-thiophenyl, 'n' is 0 or 1, and also relates to an electrophotosensitive material comprising a photosensitive layer containing this derivative. The derivative is excellent in electric charge transferring capability, compatibility with a binder resin and stability, thus offering the electrophotosensitive material superior to the prior-art products in sensitivity and repeatability.
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