3results about How to "Increase light absorption intensity" patented technology

The application relates to a preparation method of an axial chlorine-coordinated cobalt-based photocatalyst and PET micro-plastic degradation application thereof. In view of the problems of difficult control of the electronic structure of a traditional M-N4 catalyst, easy recombination of photo-generated carriers and poor controllability of an axial coordination process, an equatorial pre-anchoring combined axial chlorine coordination strategy is innovatively adopted: thiourea, melamine and cobalt nitrate hexahydrate are used as raw materials to form Co-N and Co-S equatorial coordination structures through high-temperature pyrolysis, the coordination direction is anchored and a side reaction path is closed; then a chloride is used as a chlorine source to realize axial chlorine modification of a Co center through gas phase directional coordination. The method is simple in process, low in cost and free of secondary pollution. The prepared catalyst has a unique asymmetric coordination structure, the electronic structure is optimized, the carrier separation efficiency is improved, the photocatalytic degradation effect on PET micro-plastics is excellent, the catalyst has good stability and circulation, and has great application potential in micro-plastic pollutant treatment.

The application discloses a preparation method of Cu / PDI composite material, which comprises the following steps: step 1, 0.3993g Cu(CH3COO)2.H2O is added into 21mL DMF aqueous solution with a volume fraction of 14%-100%, and stirring is conducted to completely dissolve the Cu(CH3COO)2.H2O, so as to obtain solution A; step 2, 1g PVP is added into the solution A, initial stirring is conducted, then 3.993-35.937mg PDI is added, and continuous stirring is conducted, so as to obtain solution B; and step 3, the solution B is transferred into a polytetrafluoroethylene reaction kettle, the reaction kettle is placed into a drying box, reaction is carried out at 140-180 DEG C for 5-8h, the reaction kettle is cooled to room temperature, and the product C is collected, and then washing and vacuum drying are sequentially conducted, so as to obtain the Cu / PDI composite material, the near-infrared light absorption intensity of the Cu / PDI composite material is enhanced, and the Cu / PDI composite material has excellent photocatalytic activity.

An optical device includes an active layer that includes at least two outer barriers and at least one coupled quantum well that is inserted between the at least two outer barriers. Each coupled quantum well includes at least three quantum well layers and at least two coupling barriers that are respectively provided between the at least three quantum well layers. Thicknesses of two quantum well layers disposed at opposite end portions of the at least three quantum well layers are less than a thickness of the other quantum well layer disposed between the two quantum well layers disposed at the opposite end portions. A bandgap of the two quantum well layers disposed at the opposite end portions may be higher than a bandgap of the other quantum well layer disposed between the two quantum well layers.