8results about How to "Long afterglow" patented technology

The invention belongs to the field of X-ray long-afterglow luminescent materials. The technical problems that traditional Pr < 3 + > doped fluoride is insufficient in afterglow performance, X-ray imaging depends on continuous irradiation, and color scattering noisy points exist are solved. The NaLuF4: Mg / Cs / Pr fluoride material is prepared by adopting a Cs < + >-Mg < 2 + > co-doping regulation strategy, the material is synthesized by an oleic acid-octadecene liquid phase method, and the X-ray excitation afterglow intensity of Pr < 3 + > is improved by about 110 times by utilizing the synergistic effect that Cs < + > enhances X-ray absorption and Mg < 2 + > optimizes a carrier shallow-deep trap level; the material is prepared into the high-light-transmittance rare earth nano flexible scintillation screen with the resolution ratio of 20.01 lp / mm. According to the invention, zero-noisy-point time-delay imaging after low-dose X-ray transient irradiation is realized, continuous irradiation is not needed, the radiation dose is lower, and the method is mainly applied to the field of X-ray time-delay imaging of low-dose medical diagnosis and industrial nondestructive testing. The method does not need continuous X-ray irradiation, and has important application value in the fields of medical diagnosis, industrial nondestructive testing and the like.

The invention relates to the technical field of material preparation, and discloses a modified luminescent material which comprises the following components in parts by weight: 10-450 parts of a luminescent material and 5-50 parts of a coupling agent, wherein the luminescent material and the coupling agent contain the same metal element; the coupling agent in the modified luminescent material and the luminescent material have the same elements, the coupling agent and the luminescent material are endowed with similarity of structures and functional groups, the compatibility between the coupling agent and the luminescent material is good, the luminescent material is not easy to hydrolyze, the stability of the modified luminescent material is improved, and the luminescent fiber material prepared from the modified luminescent material has excellent mechanical properties and optical properties and is suitable for industrial production. And meanwhile, the stability is high.

The invention belongs to the technical field of doped host-guest long-afterglow materials, and particularly relates to a boron atom doped organic host-guest long-afterglow material with adjustable luminescence color and a preparation method and application thereof. The method comprises the following steps: dissolving guest molecules of an organic long afterglow material in methanol or deionized water to obtain a methanol solution or a deionized water solution of the guest molecules; and adding boric acid host molecules, adding methanol or deionized water or ethanol, heating and stirring to obtain a clear solution, standing at room temperature, and separating out crystal grains or amorphous powder to obtain the boron atom doped organic long afterglow material. A series of luminescent materials are developed by utilizing an organic host-guest doping mechanism, and the material system has the advantages of low cost, low toxicity, easiness in preparation and the like; the organic host-guest doped room temperature phosphorescent system provided by the invention not only optimizes the luminescence performance, but also has adjustable luminescence color, and has potential application in the fields of biological anti-counterfeiting, data encryption, organic light emitting diodes and the like in the future.

The invention discloses a chlorosilicate cyan long afterglow luminescent material and a preparation method thereof. The chemical expression of the luminescent material is Sr 8‑m‑n SiO 12 Cl8:Eu m ,R n . According to the stoichiometric ratio of each element in the chemical expression, each raw material is weighed, mixed, and then an appropriate amount of ethanol is added and ground. After mixing, it is calcined in a high-temperature tube furnace with a reducing atmosphere, and then ground again after cooling in the furnace to obtain a chlorosilicate cyan long afterglow luminescent material. The luminescent center of the luminescent material obtained comes from Eu 2+ , trivalent rare earth ion La 3+ 、Ce 3+ As auxiliary activating ions, the luminous intensity of the long afterglow luminescent material is enhanced and the luminous time is increased. After irradiation with ultraviolet light for 10 minutes, the light source is removed and the afterglow of about 8 hours can still be observed. At the same time, it has the excellent chemical stability and thermal stability of silicate materials. In addition, the preparation method of the present invention is simple, pollution-free and low-cost.

The invention discloses a long afterglow luminescent material, the chemical formula of which is CaM x N y TiO 3 Pr, wherein M = one or more elements of Sr, Ba, Mg, Be, N = one or more elements of Yb, Er, Nd, Tm, Ho, 0≤x<0.4, 0≤y<0.4; the long afterglow luminescent material prepared by the present invention has excellent chemical stability and uniform crystal form, and the afterglow time is as long as 8.5h. In addition, the material has good water resistance and can be used in water-based paints, solving the problem of less red luminescent materials in water-based paints, and has low cost and can be mass-produced. The obtained product does not contain radioactive elements and will not cause harm to the environment and human body.

This invention relates to the field of advanced petrochemical new materials technology, and discloses a luminescent composite material, its preparation method, and its application. The composite material comprises the following components: homopolymer polypropylene, polybutylene succinate, a compatibility modification system, double-modified rare-earth strontium aluminate luminescent powder, dispersant, antioxidant, weathering agent, toughening agent, nucleating agent, and silane coupling agent. This invention employs a compatibility modification system composed of maleic anhydride-grafted PP-g-PBS copolymer and double-modified nano-montmorillonite. The maleic anhydride-grafted PP-g-PBS copolymer constructs a chemical link between the polypropylene and polybutylene succinate molecular chains through a grafting reaction, reducing the interfacial tension between the two resins. The double-modified nano-montmorillonite, after ionic liquid intercalation and silane grafting treatment, exhibits increased interlayer spacing and improved surface activity, uniformly dispersed in the matrix, and acts as a physical crosslinking point, improving the compatibility of the matrix resin and preventing phase separation.

The application discloses an intelligent response organic room-temperature phosphorescent material and a preparation method and application thereof. The method comprises the following steps: dissolving a dipyridyl phosphor, a monomer and a crosslinking agent in a supersaturated solution obtained by melting a hydrated salt to obtain a mixed solution, adding an initiator into the mixed solution, stirring, and obtaining a precursor solution; and the monomer comprises acrylamide, acrylic acid or methyl methacrylate. The preparation method has the advantages of mild conditions, short preparation process, low cost, cheap and easily available raw materials, and the prepared material has the advantages of good stimulus response, long afterglow time, long phosphorescent lifetime and the like, and the material can realize response through touching, and has a wide application prospect in the fields of afterglow imaging, information encryption and anti-counterfeiting, warning or sensing.

The invention discloses a material capable of activating yellow long afterglow by sunlight and a preparation method thereof, and belongs to the field of photoelectric functional materials. The chemical expression of the material is Sr1-xGa2-ySi2-zO8: xEu < 2 + >, yMn < 2 + > and zTM, x is the amount of substance doped with Eu < 2 + >, x is greater than 0 and less than or equal to 0.1, y is the amount of substance doped with Mn < 2 + >, y is greater than 0 and less than or equal to 0.2, z is the amount of substance doped with TM, z is greater than 0 and less than or equal to 0.1, and TM is transition metal ions and comprises one or more of V, Nb, Ta, Mo and W ions. The material disclosed by the invention can emit yellow light in a range of 400-700nm under the excitation of sunlight, can maintain afterglow with relatively high strength for a relatively long time, is good in structural stability, and can fully meet the actual application requirements of the yellow long-afterglow luminescent material.