1414 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 provides a zeolite imidazate framework fluorescent material and a preparation method and application thereof, and belongs to the technical field of detection material preparation and environment. Quantum dots, a molecular imprinting technology and an MOFs material are combined, firstly, Mg and N co-doped graphene quantum dots and ZIF-8 are compounded, then imprinting is carried out on the surface of ZIF-8, and the zeolite imidazate framework fluorescent material based on MOFs is obtained. In the zeolite imidazate framework fluorescent material, Mg and N co-doped graphene quantum dots not only have good fluorescence performance, but also can generate electron transfer with SDZ to form hydrogen-bond-like acting force, imprinted holes similar to a target object in size and shape are reserved in the surface of the imprinted material, and the target object needing to be detected can be selectively recognized; the zeolite imidazate framework fluorescent material can be used for detecting sulfadiazine in the environment and has good practicability.

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.

Donor-acceptor type thermally activated delayed fluorescent emitters based on imidazo[1,2-F]phenanthridine and analogues for full color displays and lighting applications.

The invention provides a near-infrared fluorescent material activated by Sm < 2 + > as well as a preparation method and application of the near-infrared fluorescent material. The chemical composition of the fluorescent material is Si < 2-x > Al < x > N < 2 + y > O < 1-y >: Mz, Smm, Lnn, m in the formula is one or more elements of Ba, Sr, Ca and Mg; ln is one or more elements of Bi, Yb, Eu, Nd, Gd, Tb, Dy, Ho, Er, Tm and Pr; 0 < = x < = 0.2, 0.1 < = y < = 0.5, 0 < = z < = 0.5, 0 < = m < = 0.15, and 0 < = n < = 0.1. The luminescent material provided by the invention has a brand new chemical composition, takes Sm < 2 + > as an activation center, and shows a near-infrared luminescence behavior in a gap occupation manner. The fluorescent material can be excited by light within the wavelength range of 300-600 nm, so that narrow-band near-infrared light of 681 nm is emitted, and therefore, the fluorescent material can convert ultraviolet light, purple blue light and green light into near-infrared light. The near-infrared fluorescent material provided by the invention has the advantages of convenient synthesis method and stable chemical properties, and is suitable for the fields of biological imaging, plant growth illumination, white light LEDs, temperature sensors and the like.

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.

The invention discloses a distributed fluorescence temperature measurement method based on 45-degree inclined gratings, and relates to the field of temperature monitoring under high-temperature conditions of engine turbine blades and the like. 45-degree inclined grating strings are designed and manufactured, the outer sides of the 45-degree inclined gratings are coated with fluorescent materials, and the fluorescent materials are made to emit light through ultraviolet pulse excitation light; the fluorescence returns to the optical fiber through the 45-degree inclined grating, the fluorescence lifetime is measured, temperature monitoring is achieved according to the relation between the fluorescence lifetime and the temperature, the detection position is calculated through the pulse light return time, and temperature distribution of different positions is obtained. According to the distributed fluorescence temperature measurement method based on the 45-degree inclined grating, the measurement precision and the signal processing capacity are improved through a time correlation single photon counting method, the grating can be inscribed on a sapphire optical fiber, and the method is suitable for temperature monitoring in the high-temperature field of engine turbine blades and the like; and meanwhile, the device has a multi-point temperature measurement effect with high precision and strong high-temperature adaptability, and is of great significance to high-temperature environment monitoring.

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.

Donor-acceptor type thermally activated delayed fluorescent emitters based on imidazo[1,2-F]phenanthridine and analogues for full color displays and lighting applications.

The invention discloses an aggregation-induced emission metal organic framework, a preparation method thereof and application of the aggregation-induced emission metal organic framework in portable detection of low-concentration nitrobenzene. According to the aggregation-induced emission metal organic framework, ZrCl4 provides Zr < 4 + >, 2-sulfonic terephthalic acid and AIE molecule 2, 3, 5, 6-tetra (4-carboxyl phenyl) pyrazine as organic ligands, an aggregation-induced emission fluorescent material is obtained through a solvothermal method, due to the coordination effect and limited intramolecular rotation, the material shows bright blue fluorescence, and the fluorescence intensity of the aggregation-induced emission metal organic framework is greatly improved. The aggregation-state fluorescence can be obviously quenched after the fluorescent probe is contacted with nitrobenzene. The aggregation-induced emission metal organic framework material is obtained by utilizing the aggregation-induced emission performance of aggregation-induced emission molecules, and the material has good detection capability on nitrobenzene, can rapidly and efficiently detect nitrobenzene in a solution, and has good cycle performance. Meanwhile, the nitrobenzene gas can be detected for multiple times, and good sensitivity and practicability are achieved.

The invention belongs to the technical field of agricultural light supplement, and particularly relates to an agricultural light supplement lamp system and method based on optical fiber transmission and fluorescence conversion. Efficient light distribution from a single light source to multiple application terminals is achieved, and the proportion of blue light to red light can be flexibly adjusted according to the photosynthesis requirements of crops. In addition, the optical shaping system arranged behind the application tail end ensures that the light can be accurately irradiated on the target crop, so that the light utilization rate and the energy conversion efficiency are greatly improved. Through the technical innovation, the wiring design is simplified, the complexity and the cost of the system are reduced, and the effectiveness of photosynthesis and the growth quality of crops are remarkably improved.

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 discloses a laser illumination ceramic phosphor with adjustable emergent light spots and a preparation method of the laser illumination ceramic phosphor. The ceramic phosphor comprises a light conversion layer and a light scattering layer covering one surface of the light conversion layer. Wherein the light scattering layer is composed of a porous silicon dioxide sublayer and a compact silicon dioxide sublayer, and the porosity of the porous silicon dioxide sublayer is larger than that of the compact silicon dioxide sublayer. The invention has the following beneficial effects: on the premise that the luminous efficiency of the fluorescent material is not reduced, the problem of non-uniform distribution of light spot color and brightness of light emitted by a laser illumination product is effectively improved, and uniform white light emission is obtained.

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 relates to a purple-light-excited blue-light fluorescent material for a sunlight-like LED (light-emitting diode) as well as a preparation method and application of the blue-light fluorescent material. The chemical expression of the fluorescent material is Ca2LuZr2Al1. 5Ga1. 5O12: xCe < 3 + >, wherein x is more than or equal to 0.02 and less than or equal to 0.07. The blue light fluorescent material for the purple light excitation type sunlight LED is a brand new and unreported purple light excitation Ce < 3 + > doped oxide blue light emission fluorescent material, the fluorescent powder has a wide excitation band, the effective absorption range covers 300-450 nm, the fluorescent powder can be excited by purple light, and blue light with the central wavelength being 485 nm is emitted. The fluorescent powder has the advantage of stable physical and chemical properties, can be prepared by adopting a conventional solid-phase reaction method, has the characteristics of simple preparation process and facilitation of industrial production, and can be used as a good candidate material for wide application of a next-generation full-spectrum illumination white light LED (light-emitting diode). The fluorescent powder can be completely and well matched with the existing purple light chip, meets the commercial market requirements, and is suitable for application of white light LEDs, sunlight-like LEDs, full-spectrum LEDs and the like.

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 invention discloses a comprehensive measurement system for a two-photon fluorescent material. The comprehensive measurement system comprises a laser, a tunable attenuator, a beam splitter, a reference light integrating sphere, a reference light spectrograph, a focus lens, a test light integrating sphere, a test light integrating sphere, a transmission light integrating sphere, a transmission light spectrograph, a stepping motor controller, a computer and the like. By means of the comprehensive measurement system, comprehensive measurement of multiple key performance parameters of the two-photon fluorescent material is achieved, the accuracy and reliability of measurement are improved, and powerful technical support is provided for research and application of the two-photon fluorescent material.

The invention belongs to the technical field of 3D printing and flexible high-hydrophobicity self-luminous life jackets, and particularly relates to a flexible high-hydrophobicity self-luminous life jacket and a preparation method thereof. A self-luminous waterborne polyurethane emulsion of a hydrophobic modified energy-storage long-afterglow luminescent material is synthesized, the prepared self-luminous waterborne polyurethane emulsion is used for coating and post-processing a thermoplastic polyurethane elastomer (TPU) flexible life jacket part formed by SLS, and a luminous coating permeates into micro-gaps in the surface of the TPU part and is attached to the surface. And a firmly attached self-luminous coating is formed after curing, so that the hydrophobic property of the TPU life jacket product is obviously improved, and the self-luminous function in a dim and dark environment is also realized. The problems that a traditional fluorescent material is low in luminous intensity, incapable of continuously emitting light, poor in water resistance and the like are solved, and excellent high-hydrophobicity self-luminous performance is obtained on the premise that the original SLS forming process characteristics of the TPU life jacket are not changed and the mechanical property of the TPU life jacket is reserved.

An organic electroluminescent device having a light-emitting layer, wherein the light-emitting layer contains a host compound having a boron atom and an oxygen atom in the molecule as a first component, a thermally assisting delayed fluorescent material such that the energy difference ΔEST between the excited singlet energy level and the excited triplet energy level is 0.20 eV or less as a second component, and a fluorescent material as a third component, and has a high light emission efficiency.

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.