47results about How to "Increase the intensity of upconversion luminescence" patented technology

The invention belongs to the technical field of a nano up-conversion luminescent material, in particular relates to a preparation method for a small-sized NaYF4 nano substrate material with a hexagonal phase by inducement with rare earth nano crystal nucleus. In the method, rare earth ions are doped in the NaYF4 nano substrate material so as to obtain a nano material with a low up-conversion luminescence threshold and high luminescence strength. In the method, the small-sized beta-NaYF4 nano substrate material is generated by inducement with a hydrothermal (solvent) process in the presence ofrare earth fluoride nano crystal nucleus, wherein the size of the particle is from 20nm to 200nm, and distribution of the size is even. According to the invention, a preparation method of the small-sized NaYF4 nano substrate material with the hexagonal phase is expanded, and the problem that the NaYF4 nano substrate material, especially water-soluble NaYF4 nano substrate material is difficultly generated at low temperature, is solved. By using the nano up-conversion luminescent material, the demand on biological fluorescent identification probes and disease diagnosis and treatment materials is met, and a foundation is established for the practicable application of the up-conversion luminescent material.

The invention relates to a luminescent material and a preparation method thereof, particularly relates to a zirconium-ytterbium-holmium tri-doped lithium niobate crystal high-upconversion luminescent material and a method for preparing the same, and aims to solve the technical problems of low luminous efficiency and poor light damage resistance of existing LiNbO3:Ho crystal. The zirconium-ytterbium-holmium tri-doped lithium niobate crystal high-upconversion luminescent material is made of Li2CO3, Nb2O5, ZrO2, Yb2O3 and Ho2O3. The preparation method includes: weighing, mixing, presintering, seeding, shoulder expanding, isometric growing and crystal polarizing, so that the zirconium-ytterbium-holmium tri-doped lithium niobate crystal high-upconversion luminescent material can be obtained. The light damage resistance of the crystal is greatly improved when 2mol%-6mol% ZrO is doped in the zirconium-ytterbium-holmium tri-doped lithium niobate crystal high-upconversion luminescent material, and improved by three orders of magnitude as compared with that of crystal with 0mol% ZrO doped, and the upconversion luminescence intensity of the doped crystal is gradually improved along with increase of Zr ionic concentration.

The invention discloses a preparation method of a water-soluble upconversion fluorescence nano material. The preparation method comprises the steps of (1) preparing a rare earth nitrate solution, wherein the molar ratio of yttrium irons to ytterbium ions to erbium ions in rare earth ions is (60-90):(5-35):(0.5-10); (2) adding lower alcohol and a water-soluble rare earth ion ligand and uniformly mixing, and adding a sodium fluoride aqueous solution to obtain mixed liquid, wherein in the mixed liquid, the molar ratio of fluorine ions to the total rare earth ions is (5-16):1, and the volume of fatty alcohol accounts for 1/3-1/2 of the volume of the mixed liquid; (3) performing a hydrothermal reaction on the obtained mixed liquid at 200-240 DEG C for 10-24 hours, and after the reaction, performing centrifugal separation on a solid product to obtain the upconversion fluorescence nano material. By adopting the preparation method disclosed by the invention, the prepared upconversion fluorescence nano material takes a hexagonal crystal phase as a main body, has relatively high upconversion luminous intensity and good water solubility, and is applicable to biological markers.

The invention relates to an infrared ray excited strontium aluminate based up-conversion luminescent functional material and a preparation thereof. The up-conversion luminescent material is obtained by doping a rare earth element and/or alkali metal element in a strontium aluminate matrix with a monoclinal structure and is of a monoclinal strontium aluminate structure. The chemical components of the up-conversion luminescent material meet the following chemical general formula: Sr(1-x-y-z)AxMyRzAl2O4, wherein A is one or more of alkali metal elements such as Li<+>, Na<+> and K<+>, and x is larger than or equal to 0 and less than or equal to 0.40; M is selected from rare earth elements such as Ho<3+> and Tm<3+>, and y is larger than or equal to 0.0005 and less than or equal to 0.10; and R is selected from rare earth elements such as La<3+>, Yb<3+> and the like, and z is larger than or equal to 0.001 and less than or equal to 0.30. The strontium aluminate based up-conversion luminescentmaterial has good physical and chemical stabilities, no radioactive contamination, high luminous intensity and adjustable color, is easy to synthesize and can be widely used in the fields of biomolecule fluorescence labeling, lasers, three-dimensional display, infrared detection, forgery prevention, solar batteries and the like.

The invention discloses an up-conversion luminescent structure capable of raising luminescence intensity and a preparation method, wherein the structure comprises a substrate, a metal film layer, a dielectric layer and an up-conversion luminescent layer; the method comprises the steps of depositing Ag or Au on a piece of glass or silicon substrate by vacuum evaporation or direct current sputtering to form the metal film layer; then sputtering a layer of zinc oxide film by radio frequency magnetron sputtering; and finally spin coating a layer of fluorination lanthanum potassium doped with rare earth ion. According to the invention, the fluorination lanthanum potassium doped with rare earth ion is taken as the up-conversion luminescent material to enhance the luminescence intensity of the upper transition luminescent structure; and the thickness of the dielectric layer zinc oxide film is controlled to regulate and control the luminescence intensity of the up-conversion luminescent structure, therefore up-conversion luminescence intensity is enhanced. The up-conversion luminescent structure can be applied in biomedical science, luminescent devices and solar energy cell fields; the preparation technology is simple; the operation is easy and the application prospect is wide.

The invention is an oxyhalogen tellurate upconversion light-emitting, and its characteristic: its components and component contents (mol%) as follows: TeO2 58-80, PbF2 + PbCl2 10-30, BaO + BaF2 0-10, XY (X = Na and K; Y = F and Cl) 0-10, ZnO + ZnBr2 0-10; La2O + Al2O3 0-5, and Yb2O3 + Er2O3 1-4.

The invention discloses an up/down conversion dual-mode light-emitting nanocrystalline and a preparation method and application thereof, and relates to the technical field of nanocrystalline materials. According to the nanocrystal, rare earth chloride is used as a precursor, and monodisperse rare earth fluoride nanoparticles with small particle sizes are prepared as cores under the joint participation of sodium hydroxide and ammonium fluoride; an epitaxial growth method is used, oleic acid and octadecene are used as a mixed solvent, and the rare earth oleate precursor and sodium fluoride jointly act in a high-temperature solvent to realize coating of the shell rare earth fluoride nanocrystalline. The method is simple in synthetic route operation, uniform in product particle size distribution and high in purity, the nanocrystalline is endowed with stronger red and near-infrared two-region fluorescence by doping different rare earth elements and controlling the sizes of a core and a shell in a core-shell structure, and the nanocrystalline can be used as a potential optical imaging contrast agent due to near-infrared fluorescence, so that the contrast agent has a wide application prospect. Due to red light emission, the prepared nanocrystal can be used as a nano energy converter to be applied to light-triggered therapy.

The invention relates to a heavy metal oxide block glass material for up-conversion of white light and a method for enhancing the illumination intensity of the heavy metal oxide block glass material. The heavy metal oxide block glass material for the up-conversion of the white light consists of the following components in percentage by mass of the glass material: 47wt% to 49wt% of TiO2, 30wt% to 44wt% of La2O3, 3wt% to 4wt% of ZrO2, 0.1wt% to 1.1wt% of Er2O3, 0.3wt% to 6.1wt% of Tm2O3 and 2.7wt% to 11.2wt% of Yb2O3, wherein the sum of the mass percentages of the components is 100%.

The invention relates to a preparation method of a single-green up-conversion fluorescent marking material, in particular to a preparation method of a fluorescent marking material, solving the problems of complicated preparation process, poor chemical stability, easy light injury, toxicity, low detection sensitivity and poor monochromaticity of a traditional preparation method of the fluorescent marking material. The method comprises the following steps of: dissolving Y2O3, Yb2O3, Ho2O3 and Eu2O3 to concentrated sulfuric acid; adding deionized water; adding an LiNO3 solution; adding a complexing agent citric acid; then, adding ammonia to adjust a pH value; drying to obtain dried gel; calcining the dried gel; and naturally cooling to a room temperature to obtain a single-green up-conversion fluorescent marking material. The method has simple preparation process, low reaction temperature and hardly damaged crystal lattice, the single-green up-conversion fluorescent marking material prepared by using the method has high purity, good evenness of particles in 20-50 nm, strong luminescence and favorable monochromaticity.

The invention relates to a method for preparing an upconversion fluorescent material from waste lithium battery electrolyte. The method comprises the following steps of obtaining waste lithium battery electrolyte subjected to impurity removal; adding the waste lithium battery electrolyte into a three-necked flask containing an organic solvent, calcium ions and rare earth ions; after vacuum filling, introducing inert gas for protection; performing heating to a certain temperature; performing high-temperature calcination on the obtained product to obtain a lithium doped CaF2-based upconversion fluorescent material. The method has the advantages that the cost for resource utilization of the waste lithium battery electrolyte is low; the operation process is simple; fluorine ions and lithium ions in the electrolyte are utilized at high values; the obtained lithium doped CaF2-based upconversion fluorescent material has efficient upconversion fluorescent performance through the excitation of 980nm near-infrared light.

The invention discloses a preparation method of a water-soluble upconversion fluorescent nano material. The preparation method comprises following steps: a rare earth nitrate solution containing yttrium ions, ytterbium ions and erbium ions is prepared, a fatty alcohol and a water-soluble rare earth ion ligand are added for uniform mixing, and sodium fluoride aqueous solution is added so as to obtain a mixed solution, wherein (1) molar ratio of fluorinion to the total rare earth ion is (5-16):1, and (2) volume ratio of the fatty alcohol to water in the mixed solution is (0.5-1):1; the mixed solution is subjected to hydrothermal reaction at a temperature of 200 to 240 DEG C, is cooled to room temperature, and is subjected to centrifugation to separate a solid product, and then the water-soluble upconversion fluorescent nano material is obtained. The water-soluble upconversion fluorescent nano material is mainly of hexagonal phase, up-conversion luminescent intensity is high, water solubility is relatively high, and the water-soluble upconversion fluorescent nano material is suitable to be used as a biological marker.

The invention relates to a magnesium, erbium and ytterbium doped sodium niobate, a preparation method and an application thereof. The preparation method comprises the following steps: S1) dissolving erbium source, ytterbium source, niobium source and sodium source in a solvent, thereby acquiring a mixed solution, wherein the solvent is a mixed solvent of water and ethylene glycol; S2) triggering the mixed solution to react for 24-48h at 260-270 DEG C, filtering and drying, thereby acquiring solid powder; S3) calcining the solid powder for 0.5-2h at 900-1050 DEG C, thereby acquiring the magnesium, erbium and ytterbium doped sodium niobate. The preparation method provided by the invention is a solvothermal method; the preparation process is simple; in the magnesium, erbium and ytterbium doped sodium niobate provided by the invention, under 980nm laser excitation, erbium ion (Er3+) is a rare earth luminescence center, ytterbium ion (Er3+) is a sensitizing ion and magnesium metal ion (Mg2+) is used for increasing the up-conversion luminescence efficiency.

The invention discloses a method for realizing quantum regulation and control on upconversion luminescence of a rare earth-doped material based on a micro-nano resonant structure, which comprises the following steps of: modulating a resonant mode, inhibiting radiative transition of a luminescence channel, and promoting particles in various excited states to be redistributed, including the processes of energy transfer and non-radiative transition of the particles among the different excited states, so as to realize quantum regulation and control on the upconversion luminescence of the rare earth-doped material. When the resonance wavelength of the micro-cavity is in the emission wavelength of the nanoparticles, more particles are gathered in the excited state of one allowed channel, so that the light emission of the micro-nano resonant cavity is enhanced, and the light field mode in the micro-nano resonant cavity is corrected; quantum regulation and control are carried out on multi-step electron transition processes (including radiation transition and non-radiation transition) among multiple energy levels through a resonance mode; when the resonant wavelength of the microcavity is at the emission wavelength of the nanoparticles, the up-conversion luminescence intensity at the position can be enhanced, and up-conversion luminescence of other unneeded emission wavelengths can be inhibited, so that the unneeded luminescence process can be inhibited, the luminescence process at the needed specific wavelength can be promoted, and monochromatic luminescence can be realized.

The invention discloses an erbium ytterbium double-doped lanthanum oxide lutecium laser material, which is characterized by comprising a structure shown in Formula (I): Er2x,Yb2y:(La0.1Lu0.9-x-y)2O3,wherein x is not more than 0.09 and not less than 0.01, and y is not more than 0.07 and not less than 0.01. The invention discloses a preparation method of the erbium ytterbium double-doped lanthanumoxide lutecium laser material, which includes steps of step 1, weighing Er2O3, Yb2O3, La2O3, and Lu2O3 in nitric acid and then heating at constant temperature to obtain mixed solution; adding incendiary agent in the mixed solution and then adding dispersing agent; after completely dispersing, adjusting pH value to 7; continuing the constant-temperature heating and gradually dewatering to obtain gel; step 2, drying the gel and then grinding and calcining; then grinding to obtain nano-powder; step 3, adding sintering aid and absolute ethyl alcohol in the nano-powder to stir, dry and grind so asto obtain the pretreated powder; step 4, pressing the pretreated powder to obtain a blank biscuit; cooling under static pressure to obtain a blank body; step 5, performing constant-temperature vacuumsintering on the blank body to obtain the laser material.

The invention provides a fluorescent probe material as well as a preparation method and application thereof, and belongs to the technical field of inorganic luminescent materials. The fluorescent probe material provided by the invention can emit 980nm up-conversion light under the excitation condition of a 1550nm laser, the excitation light and the emission light are both located in a near-infrared region, no background fluorescence exists in the detection process, and the accuracy is high; moreover, an oleic acid ligand on the surface can enable core-shell nanocrystals to have good dispersity in gasoline, the influence of lead ions on the surface of the core-shell nanocrystals is promoted, the lead ions can effectively capture electrons on the Er<3+> ion excited state energy level, and then the energy transfer efficiency from Er<3+> to Yb<3+> is reduced; therefore, the up-conversion luminescence intensity of Yb <3+> ions at 980nm is gradually weakened along with the increase of the lead ion concentration, and the probe material can be applied to quantitative detection of the lead content in gasoline.