60results about How to "Improve light responsiveness" patented technology

An oxygen-quenching luminophore constituting part of a pressure-sensitive luminophore is directly bonded by a covalent bond to an organic polymer compound having trimethylsilyl groups, so the luminophore molecules are retained in the polymer and free aggregation is inhibited when the organic solvent is evaporated. It is therefore possible to prevent light response from being reduced by the aggregation of the luminophore molecules during evaporation of the organic solvent, which is a drawback of forming films from conventional mixed-type pressure-sensitive paints. A thin-film sensor with uniform characteristics can be formed by spraying or application from a pressure-sensitive paint obtained by mixing a functional polymer with a solvent. In addition, a coating solution that has high reproducibility and is suitable for spraying or application can be obtained merely by dissolving the functional polymer as a single component in a suitable solvent. It is possible to obtain a functional polymer, a pressure-sensitive paint, and a pressure-sensitive element in which a reduction in light response due to luminophore aggregation can be prevented, and a thin sensor film having uniform characteristics can be formed, even when the organic solvent has evaporated.

Specifically provided is a chromene compound represented by formula (1), which has a short fading half-life even at low temperatures in a common polymer solid matrix. (In formula (1), R1 represents a hydroxyl group or the like; each of R2 and R3 represents an aryl group or the like; X represents a divalent group such as an arylene group; C* represents a spirocarbon atom; a spiroring A represents a saturated hydrocarbon ring having 4-12 ring member carbon atoms, or the like; and at least one ring member carbon atom constituting the ring A is a group that is represented by formula (4) (wherein each of R7 and R8 represents a cycloalkyl group or the like).)

An image forming apparatus having excellent chargeability, sensitivity and light responsivity of an electrophotographic photoconductor and capable of forming images of high quality and high resolution at a high speed in various circumstances, is provided. An electrophotographic photoconductor having a photosensitive layer containing the enamine compound represented by the following general formula (1), for example, the enamine compound represented by the following structural formula (1-1) as a charge transportation substance is mounted to an image forming apparatus and the volume average particle size of the toner contained in a developer 50 housed in a developing device 33 is set to a size from 4 to 7 mu.

A diode is described which comprises a light-sensitive germanium region (5) located on a waveguide (2) made of silicon or silicon germanium and which has lateral dimensions in a direction transverse to a direction of light propagation in the waveguide that are identical or at most 20 nm per side shorter in comparison with the waveguide.

The invention discloses a method for preparing furfural through catalytic conversion of xylose by acid photocatalyst under ultraviolet light. According to the method, ZrOCl2.8H2O and La(NO3)3.6H2O are added into distilled water and stirred to dissolve, TiVl4 solution is dropped so that pH is adjusted to a value between 8 and 11, photocatalyst is obtained through static placement and drying; sulfuric acid solution is prepared, the photocatalyst is added in the solution and the acid photocatalyst is obtained through stirring, drying and burning; the xylose and the acid photocatalyst are placed in a quartz three-neck flask, the distilled water is added and a reaction is conducted for 4h to 12h under irradiation of the ultraviolet light; and the furfural is obtained through natural cooling, suction filtration, filtrate distillation and concentration and organic solvent extraction and distillation. The acid photocatalyst has the advantages of being high in catalytic efficiency, strong in light responsiveness, renewable, capable of being recycled and the like. The preparation method has the advantages of being moderate in technology condition, low in energy consumption, high in efficiency, good in selection and the like. In the process of the reaction, no acid is added, device corrosion is avoided and environment is protected.