43results about How to "Excellent afterglow performance" patented technology

The invention discloses a method for preparing a red strontium sulphide long afterglow material, comprising a hydrothermal coprecipitation method which comprises the following steps that: (a) water-solubility strontium salt, water-solubility europium salt, water-solubility dysprosium salt, carbamide and water are weight according to the mol ratio of 1: between 0.01 and 0.05: between 0.01 and 0.05: between 4 and 6: between 28 and 32 and are put inside a container to be stirred and dissolved, the mixture is insulated in a sealing state at a temperature of between 80 and 160 DEG C for 5 to 24 hours so that a precursor is obtained; (b) the precursor is subject to filtering and annealing at a temperature of between 900 and 1200 DEG C in the reaction environment for 0. 5 to 2 hours so that the red strontium sulphide long afterglow material is prepared; the water-solubility strontium salt is strontium nitrate or strontium chloride or strontium acetate, the water-solubility europium salt is europium nitrate, europium chloride or polyimide, the water-solubility dysprosium salt is dysprosium nitrate or dysprosium chloride or dysprosium acetate, and a surface active agent is added according to the mol ratio of the water-solubility strontium salt to the surface active agent of 1: between 0.0001 and 0.0003. The method is widely applied to the fields such as building decoration, traffic transportation, military facilities, fire emergency service and goods for everyday consumption.

The invention provides luminescent ceramic with high afterglow intensity. The luminescent ceramic structurally comprises a green body layer, a cover glaze layer, a bonding layer, a luminescent layer,a transparent layer and a pattern layer from bottom to top. According to the luminescent ceramic, the bonding layer is added, so the bonding strength of the luminescent layer and the green body is achieved, the transparent layer is added, so the sealing effect on the luminescent layer can be achieved by the transparent layer, the resistance to rainwater erosion and acid-base corrosion is improved,the service life of luminous ceramic tile can be effectively prolonged, and meanwhile, surface stains and stickers can be cleaned conveniently.

The invention relates to a type of rare earth halosilicate red long-afterglow phosphor, and a preparation method thereof. Especially, the invention relates to a type of red long-afterglow phosphor prepared from a base material of rare-earth-modified solonetz halosilicate, and a preparation method thereof. The phosphor is characterized in the structural formula of: (1-[alpha])M,2[alpha]/3Ln)5(SiO4)2X2:[beta]Eu<3+>,[gamma]Ln<,>, wherein M is at least one of Mg and Ca, Ln is at least one of Y, La, and Gd, X is at least one of F and Cl, Ln<,> is at least one of Dy<3+>, Er<3+>, and Bi<3+>, [alpha]=0.1 to 1, [beta]=0.03 to0.07, and [gamma]=0.001 to 0.05. According to the method, solonetz halosilicate is appropriately modified with rare earth, such that rare-earth-modified solonetz halosilicate, which has a structural formula of (M,Ln)5(SiO4)2X2 is obtained. The rare-earth-modified solonetz halosilicate is adopted as a novel base material, and a rare earth ion Eu<3+> is adopted as a luminous ion. According to the luminous ion Eu<3+>, other rare earth ions or non-rare-earth ions are selected as sensitizers, such that the red long-afterglow phosphor with a main peak wavelength of 611nm, an initial luminance of 1200mcd/m<2>, an afterglow period greater than 12 hours, and a good chemical stability is obtained.

The invention relates to long-afterglow fluorescent powder applied to an LED and a preparation method of the long-afterglow fluorescent powder. The general chemical formula of the long-afterglow fluorescent powder is (Al-xBx)m-yCy(D1-zEz)8-mO12, wherein A is at least one of Y, Gd, Tb and Lu; B is at least one of La and Yb; C is at least one of Ce, Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm, Ti, Cr and Mn; D is Ga; E is at least one of B, Al, In and Sc; x, y, z and m represent the mole fraction of the corresponding elements; 0</=x</=0.2, 0.0001</=y</=0.2, 0</=z</=0.8, and 2.5</=m</=3.5. The preparation method adopts a two-step sintering process which uses oxidization atmosphere first and then uses reduction atmosphere to obtain the long-afterglow fluorescent powder which can be effectively excited by blue light and high in luminous intensity. The long-afterglow fluorescent powder can satisfy the application requirements of the direct current/alternating current LED, has an actual application valueand is promising in commercial prospect.

The invention relates to a specific fluorescence labeling method of food-borne probiotics. The method includes following steps: (a), preparing a Cr3+doped gallium zinc germanate long-afterglow fluorescent nano probe having near infrared fluorescence and ultralong-afterglow properties through a solvothermal-high-temperature calcining process; (b), realizing specific fluorescence labeling of the nano probe to target probiotics through antibody surface functionalizing. The method has the advantages that the nano probe prepared by the method has ultrastrong near infrared luminescence, ultralong afterglow life, excellent biocompatibility and structural stability, high grain size uniformity and low toxicity; near infrared fluorescence labeling probiotics in-vivo biological imaging technology developed by the invention can realize nondestructive tracing of distribution of probiotics after entering organisms, and the method is of important significance in developing functional sites of innovative food-borne probiotics and nutriology research concepts.

The invention discloses a praseodymium-doped laminated perovskite type red long-lasting phosphor material and relates to the field of solid light emitting materials. The chemical formula of the material is M4-x-y-zTi3O10:xPr<3+>, yRe<3+>, zA<3+>, in the formula, x is greater than or equal to 0.005 and less than or equal to 0.05, y is greater than or equal to 0 and less than or equal to 0.03, z is greater than or equal to 0 and less than or equal to 0.03, M is one or more elements of Mg, Ca, Sr and Ba, Re is one element of Y, Dy, Lu, Ho, Tm and Yb, and A is one or two elements of Li, Na, K, Zn, B, Al, Ge, Ga, Zr and In. The invention further provides a preparation method of the praseodymium-doped laminated perovskite type red long-lasting phosphor material. The invention further provides application of the praseodymium-doped laminated perovskite type red long-lasting phosphor material. The praseodymium-doped laminated perovskite type red long-lasting phosphor material is low in cost and stable in chemical property.

The invention relates to a near-infrared long-afterglow luminescent material, a fluorescent probe as well as a preparation method and application thereof. The chemical composition of the near-infraredlong-afterglow luminescent material is LaGa1-x-yCrxSbyO3, x is greater than or equal to 0.001 and less than or equal to 0.03, and y is greater than or equal to 0.001 and less than or equal to 0.03. According to the near-infrared long-afterglow luminescent material provided by the invention, LaGaO3 is used as a matrix, and ions Cr < 3 + > and Sb < 3 + > are doped to optimize the afterglow performance; the obtained near-infrared long-afterglow luminescent material can be effectively excited by X-rays to generate afterglow emission at 750nm, the afterglow lasting time is as long as 500 hours, and the near-infrared long-afterglow luminescent material has a wide application prospect in photoelectric devices or biological imaging; particularly, the nano-granular near-infrared long-afterglow luminescent material can be prepared into a fluorescent probe for in-vivo imaging, and a better imaging effect can be obtained under the excitation of low-dose X-rays.

The invention provides a long-lasting phosphor material and a preparation method thereof and relates to long-lasting phosphor materials. The chemical formula of the long-lasting phosphor material is aMIIO.bSc2O3.cZrO2.dCeO2.eMIII2O3.fMIVO2. MII is selected from at least one of Mg, Ca, Sr, Ba and Zn. MIII is selected from at least one of Y, Lu, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Mn, Ga, In, Sb, Bi and Cr. MIV is selected from at least one of Ge, Sn and Ti. A is larger than or equal to 0.5 and smaller than or equal to 1.5, b is larger than or equal to 0.5 and smaller than or equal to 1.2, c is larger than or equal to 0.001 and smaller than or equal to 0.5, d is larger than or equal to 0.001 and smaller than or equal to 0.2, e is larger than or equal to 0 and smaller than or equal to 0.5, and f is larger than or equal to 0 and smaller than or equal to 0.5. Oxides or corresponding salts of all the elements are weighed according to the mole number ratio of a, b, c and d, and grinding is carried out; grinding is carried out after presintering and cooling; after sintering and smashing are carried out, the long-lasting phosphor material is obtained.

The invention discloses a rare earth ion co-doped near-infrared long-afterglow luminescent nano material as well as a preparation method and application thereof, and belongs to the technical field of near-infrared long-afterglow luminescent materials. The chemical expression of the long-afterglow luminescent nano material is Zn3Ga2Sn2O10: xCr < 3 + >, yEu < 3 + >, wherein Cr < 3 + > and Eu < 3 + > are luminescent central ions, x is more than 0% and less than or equal to 1%, and y is more than 0% and less than or equal to 0.5%. A combustion method is adopted for preparation, acetylacetone metal salt is used as a precursor, the calcination temperature is 850 DEG C, and the calcination time is 2 hours. The synthesized long-afterglow material can be excited by a biological window and has near-infrared first-zone emission, and the afterglow performance of near-infrared first-zone emission is greatly enhanced by adjusting the proportion of doped ions to different values.

The invention discloses a novel white persistent afterglow luminescence material. The molecular formula of the material is Zn2GeO4, with a main phase structure belonging to a rhombohedral system. The invention is synthesized using a high temperature solid phase method, in which ZnO and GeO2 are grinded, mixed, then calcined, and cooled to obtain the white persistent afterglow luminescence material. Zn2GeO4 in the invention has a band afterglow spectrum across 400 nm to 700 nm after being motivated by a 254 nm ultraviolet lamp, and emits white light observed by naked eyes, and after the light source is removed, the material still emit white persistent afterglow. The color purity of the material is good, the performance of the afterglow is good, and the synthesis method of the material is simple and easy to be achieved.

The invention relates to a near-infrared high-afterglow material and a preparation method thereof and aims to solve the technical problem that existing near-infrared long-afterglow materials are weak in afterglow intensity and short in afterglow time. A molecular formula of the near-infrared high-afterglow material is (Zn1-xCax)3(Ga0.995Cr0.005)2G22O10, wherein x is greater than or equal to 0.01 and smaller than or equal to 0.03. The preparation method includes: well mixing zinc oxide, calcium oxide, gallium oxide, chromium oxide and germanium oxide according to a chemical dosage ratio, adding a mixture into water, boiling the water, and adding nitric acid to dissolve the oxides to obtain a solution; mixing the solution with a mixed solution of water, alcohol and oleic acid to obtain a mixed solution, and performing hydrothermal reaction to obtain a solid-phase product; subjecting the solid-phase product to pre-sintering and high-temperature sintering to obtain the near-infrared high-afterglow material. The near-infrared high-afterglow material can be used in the technical field of bioluminescent imaging.

The invention provides a rare earth doped long-afterglow material and a preparation method and application thereof, the rare earth doped long-afterglow material is represented by a chemical formula MgGeO3: aMn < 3 + >, bYb < 3 + > and cY < 3 + >, Mn < 3 + > and Yb < 3 + > are luminescent central ions, Y < 3 + > is a sensitizing ion, wherein 0.01 mol% < = a < = 5mol%, 0.25 mol% < = b < = 3mol%, and 0.25 mol% < = c < = 3 mol%; by introducing Y < 3 + > for doping and controlling the molar amount of luminescent central ions and sensitized ions, the finally obtained rare earth doped long afterglow material has excellent luminescent effects in a near-infrared first region and a near-infrared second region at the same time; the problem that a long-afterglow material prepared by a traditional method cannot meet the requirement that a near-infrared region has double emission peaks at the same time is solved.

The invention relates to an intracellular fluorescence labeling method of food-derived probiotics. The method comprises the following steps that a, a long-afterglow nano-luminescent material is modified by using a DNA; b, a probiotic competence is prepared; c, a DNA coated nano fluorescent probe is electrically transferred to the probiotics; d, the nano fluorescent probe is orally taken into a mouse body for imaging. The method has the advantages that the method for using the nano-luminescent material for intracellular fluorescence labeling is achieved for the first time, complex surface functionalization and antibody modification of a fluorescent material are not needed, the steps are simple and convenient, the cost is low, and compared with surface marking, the method has better stability and marking reproducibility. According to a near-infrared fluorescence labeling probiotic body in-vivo biological imaging technology developed through the method, the long-afterglow nano-luminescentproperty inside thalli can be used, metabolic behaviors and distribution conditions of probiotic bodies in a biological body can be monitored losslessly in situ in real time, and an innovative research means is provided for functional sites and nutriology of the food-derived probiotics.

The invention provides a method for preparing strontium aluminate long-persistence luminescent materials based on nanometer fusing assistants. The invention has the technical scheme that the method comprises the following steps: simultaneously preparing a nanometer ammonium pentaborate powder fusing assistant A and a nanometer aluminium borate powder fusing assistant B by a liquid phase method; then, obtaining boron of a mixed fusing assistant and a defect forming assistant through the introduction of the fusing assistant A and the fusing assistant B; and finally, using solid-phase reaction for preparing the long-persistence luminescent materials at the low reaction temperature. The invention overcomes the defects of overhigh temperature required by the reaction, high cost of equipment used in the reaction, high consumption of energy required in the synthesis process, poor luminescent performance of products and the like when the existing solid-phase method is used for preparing the strontium aluminate long-persistence luminescent materials. At the same time, the invention also solves the problems that the traditional products only pursue the persistence time, so the fusing assistant with high boron content is added, the strontium aluminate reaction products can easily obtain the excessive sintering, and the application effect of the pulverized strontium aluminate reaction products is poor. The luminescent materials of the invention are mainly applied to the fields of safety passage display, luminescent printing ink, luminous lighting and light detection, and are also usedfor novel energy-saving LED lamps with persistence.

The invention discloses an ytterbium-containing near-infrared ultra-long-afterglow gallate luminescent material and a preparation method thereof, belonging to the technical field of near-infrared luminescent materials. The chemical general formula of the material is La<1-y>AGa<11-x-z>Al O<19>: xCr<3+> and yYb<3+>, wherein A is one or two selected from the group consisting of elements with valence of +2, namely Zn and Mg; x is more than or equal to 0.0001 and less than or equal to 1; y is more than or equal to 0.0001 and less than or equal to 1; and z is more than or equal to 0 and less than or equal to 5. Yb<3+> is used as an electron trap, a new thermoluminescence peak appears in a range of 50-150 DEG C after Yb<3+> is added, afterglow intensity and afterglow time are remarkably improved, and Cr<3+> is used as a luminescence center. The near-infrared ultra-long-afterglow luminescent material is of a hexagonal structure and has a space crystal structure which is the same as the space crystal structure of LaMgGa<11>O<19>, and the space group of the material is P63/mmc. The excitation wavelength range of the material is 250-700 nm, and the emission wavelength range of the material is 600-1100 nm; the material has ultra-long afterglow decay time of 10 hours or more after being irradiated by ultraviolet light for 5 minutes, and the afterglow performance of the material is superior to the afterglow performance of a current commercial ZnGa<2>O<4>: Cr<3+> near-infrared long-afterglow luminescent material. Experiments show that the material has wide application prospects in the aspects of counterfeiting prevention, military affairs, biological imaging, optical information storage and the like. The material is simple to prepare, can be formed by one-time sintering and is easy to technically popularize.

The invention discloses a method for preparing high-performance europium and dysprosium co-doped strontium aluminate long-lasting phosphor. The method comprises the following steps: 1) taking the following raw materials according to the stoichiometric ratio: SrCO ₃ 、Al ₂ o ₃ 、Eu ₂ o ₃ and Dy ₂ o ₃ , and weigh the flux H at the same time ₃ BO ₃ 、BaF ₂ ; 2) Grinding the raw materials weighed in step 1) and the flux to obtain a slurry; 3) suctioning the slurry; 4) drying the blank, and then sintering in a weak reducing atmosphere to obtain the europium , Dysprosium co-doped strontium aluminate long afterglow phosphor. In this method, a certain concentration of boric acid/barium fluoride is added as a combined flux when the phosphor powder is sintered by the high-temperature solid-state method, so that the luminous intensity of the sample powder sintered at a certain temperature is greatly improved, and the afterglow time is also extended. The afterglow performance of the phosphor is improved.

The invention belongs to the field of anti-counterfeiting, and particularly relates to blue light fluorescent powder for ultraviolet excitation and a preparation method thereof. In allusion to the problems of unstable emission peak value and quantum efficiency and weak afterglow performance in the prior art, the invention proposes the following scheme: the blue light fluorescent powder is prepared from the following components in parts by weight: 60 parts of Ca3Ga4, 30 to 34 parts of a maleic anhydride-vinyl acetate linear alternating copolymer, 30 to 34 parts of nitrate, 20 to 24 parts of melamine, 16 to 20 parts of glue, 6 to 10 parts of urotropin and a proper amount of an ethoxy alcohol solution, the glue is maleic anhydride modified rosin glyceride mixed glue, the performance of the fluorescent powder can be enhanced through the Ca3Ga4, the maleic anhydride-vinyl acetate linear alternating copolymer, the nitrate, the melamine, the glue, the urotropine and a proper amount of the ethoxy alcohol solution, the emission peak value and the quantum efficiency are properly matched, the requirements of the commercial anti-counterfeiting fluorescent powder are met, and the afterglow performance of the fluorescent powder is further improved.