43results about How to "Long absorption wavelength" patented technology

The invention disclosed a hexaarylbisimidazole like compound, a method for preparing the same, application thereof in the preparation of photooxidant or photoinitiator, as well as a composite containing the same. Compared with the prior hexaaryldiimidazole compound, the compound in the invention can absorb longer wavelength up to 410 nanometers, so the compound and the composite containing the same have higher photosensitivity.

The invention belongs to the technical field of preparation of optoelectronic materials and particularly relates to a copper-doped red-light perovskite quantum dot and a preparation method thereof. According to the method, a cesium salt or a formamidine salt, copper acetate, lead bromide and lead iodide are adopted as raw materials, organic acids and organic amine are adopted as ligands, and the stable and efficient copper-doped red-light perovskite quantum dot processable in solutions are rapidly synthesized through a thermal injection method. The stability of the red-light perovskite quantumdot is greatly improved through copper doping, and meanwhile, it is ensured that the high-fluorescence quantum efficiency of the quantum dot approaches 90%. According to the quantum dot, the absorption wavelength is increased along with the increase of the doping amount of copper, and a blue shift phenomenon of corresponding fluorescence emission wavelength of the quantum dot occurs. Obtained red-light perovskite quantum dot powder has high stability and can still be stored for more than 15 days under the condition that the air humidity is higher than 85%. The preparation method is simple andenvironmentally friendly, and the obtained red-light perovskite quantum dot can be applied to photoelectric devices such as light-emitting diodes, photoelectric detectors, laser devices and solar cells.

The invention discloses a novel cationic photoinitiator represented by a general formula (I) in the description. According to the invention, the photoinitiator can match a longer absorption wavelengthin an application process, and has excellent photosensitive properties and the characteristics of being not easy to migrate and having yellowing resistance.

The invention relates to a class of red light aggregation-induced luminescent materials, in particular to a thieno[3,4-b]thiophene-based aggregation-induced luminescent material and a preparation method and application thereof. The light-emitting material uses triphenylamine and thieno[3,4-b]thiophene as core units, and uses 4-(4-(bis(4-methoxyphenyl)amino)phenyl)-6-methylthio Thieno[3,4-b]thiophene-2-carboxylic acid ethyl ester and 1,4-dimethylpyridinium iodide salt synthesis (E)-4-(2-(4-(4-(bis(4- methoxyphenyl)amino)phenyl)-2-(ethoxycarbonyl)thieno[3,4-b]thiophen-6-yl)vinyl)-1-methylpyridinium iodide salt, then dissolved in Acetone is added, and an aqueous solution of potassium hexafluorophosphate is added, and the material is prepared after the reaction. The fluorescence emission of the material is located in the near-infrared region, and the fluorescence brightness is strong, and can be used as a red light material in the imaging field.

The present invention discloses indole chloride, namely 2-[2-[4-[(2-cyanoethyl)-methyl-amino]-phenyl]-vinyl]-1,3,3-trimethyl A new application of ‑3H‑indole chloride in the spectrophotometric determination of platinum. When the compound is used as an organic complexing agent to measure platinum by spectrophotometry, it mainly includes the following steps: preparation of solution, drawing of a standard curve, and determination of samples. The sample determination includes: sample digestion, complexation reaction, liquid-liquid extraction, absorbance measurement. The determination method provided by the invention can avoid the near-ultraviolet saturation absorption zone and the platinum ion absorption band, has rapid color development, stable complexation products, strong anti-interference, good selectivity to platinum, safety and harmlessness, and environmental friendliness. It can be used for the separation, enrichment and detection of trace platinum in environmental water samples, model water samples, and glass.

The invention relates to a dihydroporphyrin derivative and a preparation method and an application. The dihydroporphyrin is porphyrin hydrogenated at sites 2 and 3. The meso-N substituted dihydroporphyrin compound derivatization prepartaio method is simple and feasible, and the catalyst is cheap and easily available, so that the preparation method is an environment-friendly preparation method. According to the dihydroporphyrin derivative, by introducing nitrogen atoms into the molecular structure, the conjugated system of the target compound is further enhanced, and the target compound has a relatively long absorption wavelength and a relatively high fluorescence quantum yield. Through a phototoxic experiment, the applicant verifies that the dihydroporphyrin derivative has photosensitive activity and lays a solid foundation of being developed to a novel photosensitizer.