1002 results about "Fluorescent materials" patented technology

The invention belongs to the technical field of novel fluorescent materials, and particularly discloses application of a mechanical color change pyrenyl derivative in latent fingerprint fluorescence imaging and extraction. The mechanical color-changing pyrenyl derivative can be selectively combined with fingerprint residual substances under the excitation of ultraviolet light through the unique fluorescence response characteristic, so that potential fingerprints form high-contrast fluorescence imaging on smooth or rough surfaces (such as glass, metal, plastic and the like), and the mechanical color-changing pyrenyl derivative is compatible with conventional camera equipment to realize rapid acquisition. The compound design is based on a modular synthesis route, and has the advantages of simple and convenient synthesis process, controllable raw material cost, high reaction yield and the like. The product has excellent thermal stability and chemical stability, can be stored at normal temperature and does not need special treatment, and the practical application threshold is greatly reduced. Compared with a traditional fingerprint developing technology, the method has remarkable breakthroughs in the aspects of sensitivity, substrate adaptability and operation convenience, and an efficient, economical and environment-friendly novel solution is provided for the fields of criminal investigation, forensic identification and the like.

The invention discloses a raw material mixing device for preparing a fluorescent material for backlight display and a preparation method. The raw material mixing device comprises a mixing cylinder, a feeding port is formed in the top of the mixing cylinder, an annular supporting frame is further arranged at the top of the mixing cylinder, a plurality of sets of raw material cylinders are evenly arranged on the peripheral side of the annular supporting frame, and an annular base is rotationally arranged in the annular supporting frame; a plurality of groups of arc-shaped areas are arranged on the annular base, and a material receiving box is arranged in each group of arc-shaped areas; a discharging port is formed in the bottom of the mixing barrel, a rotating shaft is rotationally arranged in the mixing barrel, the bottom end of the rotating shaft extends to the position below the discharging port and is provided with a discharging gear, and an auger is arranged on the part, located in the discharging port, of the rotating shaft; arc-shaped tooth parts used for being meshed with the discharging gear are arranged at the positions, located in the arc-shaped areas, of the inner ring plate, each arc-shaped tooth part is composed of multiple sets of tooth part units, each set of tooth part units are independently arranged on the inner ring plate in a vertical sliding mode, and a driving assembly for driving each set of tooth part units to slide is arranged on the annular base; the raw materials can be automatically fed into the mixing cylinder for stirring according to the reverse rotation of the motor in proportion.

The invention relates to the technical field of biogenic amine detection, in particular to a dicyanoethylene-based fluorescent material as well as a preparation method and application thereof. After the biogenic amine is in contact with the glass surface fluorescent probe, due to the nucleophilic characteristic of the biogenic amine, the biogenic amine can be subjected to nucleophilic substitution reaction with a probe molecule dicyanovinyl group to generate an imine chemical structure. As the electron-withdrawing capability of dicyanoethylene is stronger than that of imine, the intramolecular charge transfer effect of probe molecules is greatly reduced, so that blue shift of absorption and luminescence properties of the probe molecules is caused, and after the fluorescent probe is loaded on the surface of glass, the fluorescence intensity of the fluorescent probe is improved. The formed dicyanoethylene-based fluorescent material provides a solution for the technical problem that the existing biogenic amine detection mode is inconvenient.

The invention discloses a fluorescent composite nano material as well as a preparation method and application thereof, and belongs to the technical field of fluorescent materials. The fluorescent composite nano-material provided by the invention comprises carbon quantum dots with carboxyl modified surfaces and fluorescent nano-particles with amino modified surfaces, wherein the mass ratio of the carbon quantum dots to the fluorescent nano-particles is (0.8-3): 1; the carbon quantum dots of which the surfaces are modified with carboxyl groups are connected with the fluorescent nanoparticles of which the surfaces are modified with amino groups through amido bonds formed by dehydration condensation of carboxyl groups and amino groups; the molecular formula of the fluorescent nanoparticles is Cs2NaYCl6: Yb < 3 + > / Eu < 3 + >, the molar concentration of doped Yb < 3 + > is 15-25%, and the molar concentration of doped Eu < 3 + > is 8-12%. The fluorescent composite nanomaterial provided by the invention has the advantages of uniform particle size and high fluorescence emission intensity, has good fluorescence stability, and can be applied to the fields of humidity detection, fluorescence imaging and the like.

The invention discloses a method for preparing a fluorescent material based on a waste NCM ternary lithium battery and application of the fluorescent material, and the preparation method of the fluorescent material comprises the following steps: disassembling the waste NCM ternary lithium battery to obtain a nickel cobalt lithium manganate waste material and preparing the nickel cobalt lithium manganate waste material into powder; impurities and part of ions in the nickel cobalt lithium manganate waste powder are removed, and manganese-containing powder is prepared; and mixing manganese-containing powder, a first perovskite fluorescent raw material, a ligand, a protective material and a solvent, heating and stirring under a vacuum condition, heating under a nitrogen atmosphere, adding a second perovskite fluorescent raw material solution into the system for reaction, and cooling after the reaction is finished to obtain the manganese-doped perovskite fluorescent material. According to the method, the efficient recycling of the waste NCM ternary lithium battery is realized, the preparation cost of the fluorescent material is reduced, the resource recycling rate is improved, the environmental pollution is reduced, and the manganese-doped perovskite fluorescent material is simple to operate when chloride ions are detected after being loaded on the carrier and can be used for field detection.

The invention discloses a coated reflecting film based on an organic fluorescent coating and a preparation method of the coated reflecting film, tetra (4-aminophenyl) methane and tetra-(4-formyl-(1, 1-biphenyl)) ethylene are used as reaction monomers to prepare a novel topological structure [4 + 4] COF (3D-TPE-COF) with a tetraphenylethylene (TPE) unit, and the novel topological structure [4 + 4] COF (3D-TPE-COF) is used for preparing the reflective film based on the organic fluorescent coating. The covalent organic framework material 3D-TPE-COF is added into coating liquid as a fluorescent material to prepare a coating reflecting film based on an organic fluorescent coating, and the obtained reflecting film can convert high-energy blue light, so that the brightness of light emitted by a backlight module is higher and closer to white; meanwhile, the 3D-TPE-COF fluorescent material and the polymer particles can form hydrogen bonds in the coating liquid to avoid aggregation of the polymer particles, so that the wear resistance and scratch resistance of the coating reflecting film are improved.

A light sheet microscope for imaging biological materials uses a plurality of light beams, focused to an overlapping line to excite a fluorescent material within the biological sample. The laser-induced fluorescence image is then analyzed and displayed.

The invention relates to a red fluorescent material excited by blue light, an LED device and fluorescent ceramic. The chemical formula of the red fluorescent material is La (2-x) MgNbO6.5: xEu < 3 + >, wherein x is more than or equal to 0.01 and less than or equal to 0.1. The preparation method comprises the following steps: weighing lanthanum oxide, magnesium oxide, niobium oxide and europium oxide raw materials according to a stoichiometric ratio, grinding and uniformly mixing; sintering the uniformly mixed powder in a muffle furnace at high temperature, and cooling to room temperature to obtain the red fluorescent material. Compared with the prior art, the novel oxide-based red fluorescent powder prepared by the invention can emit positive red light of which the central wavelength is 616nm under the excitation of 465nm blue light, and can be used for white light LED (Light Emitting Diode) luminescent devices and fluorescent ceramics.

The invention discloses a fluorescent covalent organic framework material for hydrogen sulfide detection as well as a preparation method and application thereof, relates to a covalent organic framework material as well as a preparation method and application thereof, and aims to solve the technical problems that an existing porous material for H2S detection is few in structure type, unstable in COFs (Covalent Organic Frameworks) structure, high in detection limit and harsh in detection environment. The periodic structure fragment of the fluorescent covalent organic framework material for hydrogen sulfide detection is shown in the specification. 3-(5, 10-diamino-1H-phenanthrene) [9, 10-d] imidazole-2-yl) phenol and 2, 4, 6-tri (4-formylphenoxy)-1, 3, 5-triazine are subjected to a reaction to obtain a hydroxyl intermediate, the hydroxyl intermediate is modified with 2, 4-dinitrofluorobenzene, and the fluorescent material is used for qualitative detection of H2S. The method is not interfered by amino acids and anions in the environment, and is not influenced by an acid-base environment. The method can be used in the field of H2S detection.

The invention relates to the technical field of organic electroluminescence, in particular to an organic compound, application of the organic compound and an organic electroluminescence device containing the compound, in particular to a novel thermal activation delayed fluorescent material and an organic electroluminescence device adopting the compound as a luminescent layer luminescent dye and a sensitizer. The compound disclosed by the invention has structures shown as a formula (1), a formula (2), a formula (3), a formula (4), a formula (5) and a formula (6). The compound disclosed by the invention has the advantages that the compound has higher photoluminescence quantum efficiency and faster reverse intersystem crossing rate when being used as a luminescent dye in an OLED (Organic Light Emitting Diode) device, and can show excellent device efficiency and device service life when being used as a luminescent layer sensitizer. The invention also protects the organic light-emitting device adopting the compound with the general formula. # imgabs0 #

The invention discloses a building ceramic tile with a fluorescent magical color effect and a preparation method of the building ceramic tile, and relates to the technical field of building ceramic tiles. The ceramic tile sequentially comprises a green body layer, a cover glaze layer, a pattern layer, a fluorescent material layer and a transparent color-emitting glaze layer from bottom to top, the pattern layer is formed by printing a multi-layer multicolor pattern file on the cover glaze layer by using a digital ink jet machine; according to the fluorescent material layer, after patterns are printed in an ink-jet mode, a printing machine is used for accurately aligning designed marking positions, the patterns printed by an ink jet printer and the fluorescent material layers with different colors are positioned and overlapped, it is ensured that the patterns of the fluorescent material layer and the colorful patterns printed by the digital ink jet printer are completely matched and overlapped, and the multi-layer colorful effect of the brick surface is achieved. According to the invention, a fluorescent material is introduced, a novel transparent color-developing protective glaze is researched and developed, and a proper firing process is combined, so that the brick surface can show a magical color effect in both bright and dark places.

The invention discloses a near-infrared two-region aggregation-induced emission material as well as a preparation method and application thereof, and belongs to the technical field of aggregation-induced emission materials. The invention provides a fluorescent material with aggregation-induced emission (AIE) property, which can have high luminous efficiency in an NIR-II (1000 nm to 1500 nm) region. The invention aims to carry out rational structure design through the multilevel space confinement effect of molecule and aggregate levels. Through modification of a methyl group and a side chain substituent group, free rotation of an aromatic ring is effectively inhibited, and a rigid mortise and tenon interlocking structure is formed in the crystal. The water-soluble nanoparticles prepared from the synthesized aggregation-induced emission material can achieve a fluorescence quantum yield of 28.2%. By utilizing the nanoparticles with high fluorescence efficiency, the application of real-time dynamic monitoring and the like on intestinal vessels of a living body can be realized, and a new method is provided for early diagnosis and surgical intervention of acute intestinal ischemia.

The present invention discloses a method for preparing an X-ray fluorescent screen and the X-ray fluorescent screen thereof. The preparation method comprises the following steps: S1, pretreatment: cleaning and drying a microchannel structure; the microchannel structure is provided with a plurality of through microchannels, and the microchannel structure is made of glass; S2, microchannel coating: coating the sidewalls of the microchannels with a reflective film; S3, preparing a suspension: mixing fluorescent material particles, a carrier solvent, and a surfactant, and dispersing them to prepare a suspension; S4, filling the microchannels; S5, repeating the filling; S6, post-treatment: cleaning the surface of the microchannel structure and encapsulating it; the X-ray fluorescent screen is prepared using the above preparation method; the X-ray fluorescent screen comprises a microchannel structure, the microchannel structure is provided with a plurality of through microchannels arranged in an array, and the microchannels are filled with fluorescent material particles. The present invention fills the glass microchannel structure with fluorescent material particles to improve the resolution and fluorescence transmission efficiency of the X-ray fluorescent screen.

The invention relates to the field of ultraviolet light absorbers, and discloses a research and development method of an ultraviolet light absorber with a novel structure. Comprising the following raw materials in parts by weight: 25 to 30 parts of pyrene-triazine hybrid, 10 to 20 parts of MOF loaded benzotriazole, 15 to 20 parts of silicon dioxide coated nano zinc oxide, 10 to 15 parts of carbon quantum dot modified titanium dioxide, 8 to 12 parts of PLGA microcapsules, 7 to 13 parts of chitosan-hyaluronic acid composite film, 12 to 18 parts of Eu < 3 + > coated MOF fluorescent material, 8 to 12 parts of gibberellin-nano selenium compound and 5 to 8 parts of ionic liquid PF6. The absorption wavelength range is widened by virtue of a unique structure of a pyrene-triazine hybrid, the stability and dispersity are improved by MOF-loaded benzotriazole through MOF pore channels, the conditions of agglomeration and poor stability of nano-zinc oxide are improved by coating nano-zinc oxide with silicon dioxide, and the photoresponse range of titanium dioxide is expanded by modifying titanium dioxide with carbon quantum dots.

The application belongs to the technical field of fluorescent material synthesis, and particularly relates to a blue fluorescent powder with self-activation effect and a preparation method thereof, the chemical formula of the blue fluorescent powder is Li2Mg2W2O9 or Li2Zn2W2O9; the preparation comprises the following steps: 1) according to the chemical proportion of the fluorescent powder, magnesium / zinc source, lithium source and tungsten source are weighed and uniformly ground; 2) the uniformly ground mixed powder is placed into an alumina crucible, sintering is carried out, and the product is fully reacted after heat preservation for a period of time; 3) the product is uniformly ground again after cooling, and the blue fluorescent powder with self-activation effect is obtained. The application utilizes the special lattice structure of the substrate, and obtains the blue fluorescent powder with self-activation effect under an air atmosphere; the generated product has high purity, simple synthesis conditions, low cost and is easy to be prepared on a large scale; the prepared fluorescent powder has a high internal quantum efficiency of 68.7%, high luminous intensity and unique blue light emission characteristics.

The invention relates to the technical field of organic synthesis and the technical field of fluorescent materials, in particular to a boron coordination salicylhydrazone double-state emission fluorophore as well as a preparation method and application of the boron coordination salicylhydrazone double-state emission fluorophore. The structure of the boron coordination salicylazone double-state emission fluorophore is shown as I, II or III; wherein R1 is selected from one of H, halogen atoms, diethylamino and thienyl, R2 is selected from one of H, halogen atoms, diethylamino and thienyl, and R3 is selected from one of aryl, 9, 9 '-spirobifluorenyl, alkoxy and halogen atoms. The boron coordination salicylazone double-state emission fluorophore is diversified in structure and good in solubility, has excellent photophysical properties and extremely high quantum yield, and also shows excellent biocompatibility and remarkable liposome targeting property at the same time. Moreover, the preparation method of the boron-coordinated salicylazone double-state emission fluorophore adopts a one-pot two-step method, is simple and convenient, is high in yield, is green and environment-friendly, and has a wide application prospect.

The present disclosure relates to a method and device for unmixing fluorescent signals based on a joint histogram. The method and device may be configured to obtain a plurality of images of a plurality of fluorescent materials marked in different biomolecules and to unmix the signals of the fluorescent materials based on at least one joint histogram index defined between the images of each of pairs each including two or more of the obtained images. According to the present disclosure, the joint histogram index may include at least one of Kullback-Leibler divergence, cross-entropy, or Rand-index.

The invention relates to a preparation method of a terbium-doped gadolinium oxysulfide fluorescent material. The performance of the material is remarkably improved through an optimized high-temperature solid-phase method. According to the process, firstly, polyvinylpyrrolidone (PVP) and dopamine hydrochloride are used as a dispersing agent and a coating agent to prepare uniformly dispersed Gd2O3 and Tb4O7 oxide precursors, then through a fluxing agent system with the synergistic effect of boric acid and lithium carbonate and in combination with a low-temperature pre-sintering-medium-temperature vulcanization-high-temperature crystallization three-stage sintering process, grain aggregation and abnormal growth are effectively inhibited, and the Gd2O3 / Tb4O7 composite material is obtained. And finally, annealing in air to remove carbon impurities to obtain the superfine fluorescent powder with small particle size and narrow distribution. Experiments show that the particle size D50 of the fluorescent powder in the embodiment is 496-678 nm, the fluorescence decay life exceeds 1100 microseconds, the luminous intensity is high, the stability is excellent, and the fluorescent powder has wide application prospects in the fields of liquid crystal display, biomedicine and the like.

The present invention discloses a yellow-green fluorescent COFs material, its preparation method and application, belonging to the fields of covalent organic framework materials and analytical detection. In the present invention, 4,4',4'',4'''-(ethene-1,1,2,2-tetrayl)tetraphenylaldehyde (ETBA) and a flexible organic monomer 4,4'-diaminodiphenyl ether (ODA) with chelating sites are used as raw materials, methanol and acetic acid are added and shaken for dispersion, frozen with liquid nitrogen, evacuated and reacted in a constant temperature oven, the product is collected by filtration, washed with anhydrous N,N-dimethylformamide and tetrahydrofuran respectively, and then centrifuged and washed with anhydrous acetone, the solid product is collected, dried in an oven to obtain yellow ETBA-ODA-COF powder. The present invention regulates the π-π interaction in the COF structure, synthesizes a kind of ETBA-ODA-COF material with yellow-green fluorescence, and can establish a fluorescent nanoprobe to realize the analysis and detection of metal Fe 3+ , Hg 2+ ions and folic acid small molecules.

Provided in the present application are an organic light-emitting diode and a display apparatus. The organic light-emitting diode includes at least one light-emitting layer, which includes at least one phosphorescence sensitized light-emitting layer, wherein the phosphorescence sensitized light-emitting layer includes a host material, a phosphorescent sensitizer and a narrow-spectrum fluorescent material, and the full width at half maximum of the narrow-spectrum fluorescent material is less than 50 nm. The present application can improve the performance, such as the efficiency, of an organic light-emitting diode.

A light-emitting element includes an anode, a cathode, and an electroluminescent layer between the anode and the cathode. The electroluminescent layer includes an emission layer containing a host material and a first fluorescent material. A bandgap of the host material is equal to or greater than 3.0 eV and equal to or less than 3.4 eV. A difference in a level of a lowest unoccupied molecular orbital between the host material and the first fluorescent material is equal to or greater than 1.0 eV. A difference in a level of a highest occupied molecular orbital between the host material and the first fluorescent material is equal to or less than 0.3 eV

The present invention relates to an organic electroluminescent device comprising an emitting layer B comprising two host materials, namely an n-type (electron transport) and a p-type (hole transport) host material, a thermally activated delayed fluorescence (TADF) material, and an emitter material exhibiting a narrow deep blue emission with a small full width at half maximum (FWHM) and an emission maximum of 440 nm to 475 nm. Furthermore, the present invention relates to a method for generating blue light using the organic electroluminescent device of the present invention.

A water quality analysis system is calibrated without using any organic fluorescence material such as phenanthrene. The water quality analysis system analyzes a component to be measured contained in a liquid sample by a fluorescence spectroscopy, and that comprises a light irradiation section that irradiates the liquid sample with a light having an excitation wavelength of the component to be measured, a light detection section that detects a fluorescence of the component to be measured emitted from the liquid sample, a calculation unit that calculates a concentration of the component to be measured by using a fluorescence intensity obtained by the light detection section, and a solid fluorescence reference member that is arranged on an optical path between the light irradiation section and the light detection section and that emits the fluorescence by the light from the light irradiation section at a time of calibration.

The invention discloses a method for extracting lignin from lignocellulose. The method comprises the following steps: 1) cleaning and drying straws, crushing and sieving to obtain a lignocellulose raw material; 2) adding the lignocellulose raw material into a hydrogen peroxide aqueous solution, soaking for 1-2 hours, adding ethylenediamine, and reacting for 1 hour at 25 DEG C or 120 DEG C to obtain a reactant; (3) washing each gram of reactants with deionized water, and carrying out solid-liquid separation to obtain solids and washing liquid; and adding absolute ethyl alcohol into the water washing liquid, generating a precipitate, centrifuging, taking a liquid part, carrying out rotary evaporation and freeze drying to obtain lignin, and storing at-20 DEG C. Lignin obtained through the first method is low in molecular weight and more uniform in lignin chain length, more nitrogen-containing functional groups are grafted in lignin, and lignin obtained through the second method is high in fluorescence intensity and becomes an ideal raw material for manufacturing fluorescent materials.

The embodiment of the invention discloses a detection system and method for a battery cell clamping needle, and the detection system comprises a camera and a visual upper computer. The camera is used for collecting a to-be-detected image; the to-be-detected image is an image imaged on the triangular prism after the light source lights the end face of the cell clamping needle plated with the fluorescent material and the end face of the standard block; the visual upper computer is used for acquiring a to-be-detected image acquired by the camera on the detection station; and performing defect detection on the to-be-detected image to obtain a detection result of the to-be-detected image, and sending the detection result to the controller. According to the embodiment of the invention, the light source is used for lighting the end face of the cell clamp needle and the end face of the standard block which are plated with the fluorescent material, the camera is used for collecting images of the end face of the cell clamp needle and the end face of the standard block on the triangular prism, and the fluorescent material can enhance the contrast, so that details of the end face of the cell clamp are more easily captured; therefore, the definition and accuracy of the to-be-detected image are improved.

The present invention relates to the technical field of the preparation of Cr3+-doped fluorescent materials. Disclosed are the preparation of a Cr3+-doped fluorescent material and the use thereof in a plant light supplement lamp. The preparation comprises the following steps: weighing a matrix raw material and a Cr3+-containing raw material according to the stoichiometric ratio, and respectively grinding and then storing same in a dryer; placing the raw materials into a ball milling tank, and subjecting same to planetary ball milling for 3-6 hours; transferring same to an alumina crucible, and pre-sintering same for 2-5 hours; after secondary ball milling, adding a fluxing agent thereto; placing same in a high-temperature furnace and sintering same for 6-10 hours, and furnace cooling same or cooling same under the protection of an inert gas; and firstly coarsely crushing same, then grinding same to 10-30 μm, alternately cleaning same with deionized water and ethanol, drying same in an air dry oven, detecting and screening the product by using a fluorescence spectrophotometer, an X-ray diffractometer and a scanning electron microscope, and remanufacturing unqualified products after adjusting process parameters according to detection results. The present invention has a high light-emitting efficiency, and the spectrum thereof is suitable for plant photosynthetic absorption. When being applied to a light-supplementing lamp, plant growth can be promoted, the plant height and the chlorophyll content are significantly increased, and the natural spectrum is simulated, such that the material is suitable for multiple cultivation scenarios.

The invention relates to the technical field of solar cells, in particular to a wide-band-gap perovskite solar cell and a preparation method thereof. The preparation method comprises the following steps: preparation of the ITO layer, O2-plasma treatment of the ITO layer, preparation of the hole transport layer, preparation of the perovskite light absorption film layer, coating of PEAI post-treatment salt, preparation of the thermal evaporation C60 electron transport layer, preparation of the SnO2 electron transport layer by an atomic layer deposition method, plating of the ITO transparent conductive electrode by a magnetron sputtering technology, preparation of the metal gate line, and evaporation of the MgF2 antireflection layer. The organic fluorescent material NPBI2 which absorbs ultraviolet light and converts the ultraviolet light into visible light is doped into the perovskite light absorption layer, so that the damage of the ultraviolet light to perovskite is avoided, the perovskite can absorb the visible light to generate power and improve the photoelectric conversion efficiency, and the organic fluorescent material can passivate crystal defects in the perovskite light absorption layer and improve the quality of the perovskite thin film. And the carrier lifetime is prolonged.

The invention belongs to the technical field of organic electroluminescence, and particularly relates to a boron nitrogen-phosphorus oxygen skeleton fused series compound and an organic electroluminescence device.A phosphorus oxygen unit is introduced into a boron / nitrogen type multiple resonance thermal activation delayed fluorescence skeleton through a one-step phosphorus oxygen post-modification method, metal does not need to participate in the synthesis route, the yield is high, and the method is suitable for industrial production. A universal strategy is provided for expanding the structural diversity of an MR-TADF system, the provided multi-resonance type thermally activated delayed fluorescent material containing fusion of the boron, nitrogen and phosphorus oxygen frameworks has the characteristic of wide color gamut emission, and an organic electroluminescent device prepared by using the material as a luminescent material realizes wide color gamut and narrow spectrum TADF emission and has wide application prospects. And the electroluminescent device has relatively low efficiency roll-off, and is an organic luminescent functional material with good performance.

According to the high-temperature-resistant tracking master batch provided by the invention, a composite structure is adopted, and the matrix layer is composed of the high-temperature-resistant engineering plastic and the inorganic reinforcing agent and has high temperature resistance and mechanical strength; the functional layer is a tracking unit dispersed in the matrix layer and comprises magnetic nanoparticles and a rare earth fluorescent material, and the interface bonding strength is improved through silanization treatment; the protective layer is a microcapsule formed by coating the tracking unit through a sol-gel method, the thermal expansion coefficient difference between the protective layer and the matrix is less than or equal to 10%, and the rupture rate during melt blending at 320 DEG C is less than or equal to 2%. The preparation method of the tracking master batch comprises the steps of high-temperature extrusion and water-cooling pelletizing. The fluorescence intensity attenuation rate of the tracking master batch is smaller than or equal to 5% at the temperature of 300 DEG C, and the tracking master batch is suitable for full-life-cycle tracking of engineering plastics.

The invention discloses a construction method and application of NaYF4: Ln < 3 + > reversible photochromic polymer core-shell nanoparticles, and relates to the technical field of material preparation, and the technical key points are as follows: the NaYF4: Ln < 3 + > reversible photochromic polymer core-shell nanoparticles are prepared by utilizing the characteristics of luminescence concealment of rare earth doped NaYF4: Ln < 3 + > up-conversion nanoparticles (UCNPs) and dynamic fluorescence of a reversible photochromic polymer; the near-infrared / ultraviolet light dual-mode reversible photochromic fluorescent material is constructed, and the synergistic luminescence mechanism of the near-infrared / ultraviolet light dual-mode reversible photochromic fluorescent material is ascertained so as to realize the application of the near-infrared / ultraviolet light dual-mode reversible photochromic fluorescent material in multi-mode fluorescent anti-counterfeiting coding.