40results about How to "Good up-conversion luminescence performance" patented technology

The invention provides a method for preparing an upconversion nanometer material taking NaLuF4 as a base material, which includes the following steps: Step I, adding rare-earth chloride solution into ethylene diamine tetraacetic acid solution, uniformly stirring, and adding the solution into sodium fluoride water solution, stirring to obtain a solution A; Step II, adding the solution A to a reaction still for hydrothermal reaction, and cooling to obtain a solution B; and Step III, heating the solution B, and obtaining the end product, the upconversion nanometer material taking the NaLuF4 as the base material, after precipitation separation, washing and stoving. According to the invention, hydrochloric acid serves as solvent of rare earth oxide, ethylene diamine tetraacetic acid serves as surface appearance control agent, and the upconversion nanometer material taking the NaLuF4 as the base material can be prepared after the hydrothermal reaction; the prepared upconversion nanometer material taking the NaLuF4 as the base material has the characteristics of controllable surface appearance, excellent dispersity, excellent up-conversion luminescence performance, and the like; and the method has simple equipment, is easy to operate, facilitates mass production and popularization, and has better application prospects.

The invention relates to an application of nanoparticles with fluoride lutecium as a main component in biological detection and preparation of a reagent for biological detection. Furthermore, the invention also relates to the nanoparticles used in the above application and a preparation method thereof. The dimension of the material is less than 200nm. The material has an excellent luminescence property and can be used in bioimaging and biodetection as a luminescent probe.

The invention discloses rare earth element-doped bismuth layer-structured multifunctional materials and a preparation method thereof. The general chemical formula of the multifunctional materials is Bi(3-x-y-z)ErxYbyRzTi(1.5-0.5x1)W(0.5-0.5x1-x2)Mx1Mox2Ox3, wherein x is more than 0 and not more than 40 mol%, y is not less than 0, z is not less than 0 and not more than 40 mol%, x1 and x2 are more than 0 and not more than 30 mol%, x3 is not less than 8 and not more than 10, R is one or more of La, Li, Ce, Pr and Y, and M is one or more of Nb, Ta, Zr, Hf, Cr and Mn. The multifunctional materials prepared in the invention have the advantages of good ferroelectric/piezoelectric properties, high Curie point, high high-temperature thermal stability, high chemical durability, excellent up-conversion luminescence performance, excellent optical temperature sensing performance, high sensitivity and wide application temperature range, and has wide application prospects in the fields of optical temperature sensor, bio-molecular fluorescence labeling, infrared detection and anti-fake, luminescence displays and photoelectric integration.

The invention discloses a preparation method of a rare earth-doped fluoride up-conversion luminescent nano dispersion, belongs to the cross fields of chemical engineering, materials and photonics, andrelates to a method for preparing the rare earth-doped fluoride up-conversion luminescent nano dispersion by utilizing a super-gravity reaction intensifying technology, i.e. a rotating packed bed reactor. Raw materials and reagents required for realizing the synthetic method of the rare earth-doped fluoride up-conversion luminescent nano dispersion comprise rare earth chlorate, sodium hydroxide,ammonium fluoride, a surfactant, deionized water and absolute ethanol, wherein the rare earth chlorate comprises yttrium chloride, ytterbium chloride and erbium chloride; the surfactant is respectively prepared from oleic acid, oleylamine and sodium citrate; a dispersion solvent is prepared from ethanol, tetrahydrofuran, cyclohexane, chloroform and toluene. According to the preparation method disclosed by the invention, the rotating packed bed reactor is introduced for premixing a reaction precursor solution, and molecular uniform mixing is realized, so that the rare earth-doped fluoride up-conversion luminescent nano dispersion which is small in particle size and narrow in particle size distribution is synthesized.

The invention discloses a Yb<3+> activated boron tungstate up-conversion luminescent material and a preparation method thereof. Molecular formula of the luminescent material is expressed as R1-xYbxBWO6, wherein R represents one of La<3+>, Pr<3+> and Nd<3+>, X represents a mol percent of doped Yb<3+>, and x is not greater than 0.5 and greater than 0.0001. The preparation method adopts a solid-phase synthesis or chemical synthesis process, and is simple in preparation process; the up-conversion luminescent material is synthesized in the air without production of a reducing atmosphere, so that demand on the equipment is comparatively low and production cost is reduced. The prepared up-conversion luminescent material is stable in performance, and has advantages of high color purity, high brightness and the like; the up-conversion luminescent material, excited by a 975nm infrared laser, can realize up-conversion luminescence of blue and green; and the up-conversion luminescent material has application prospects in the fields of printing anti-counterfeiting, 3-dimensional display, laser medicine, high-density data storage, etc.

The invention belongs to the technical field of up-conversion luminescence anti-counterfeiting materials, and particularly relates to an up-conversion luminescence silicon dioxide aerogel and a preparation method thereof. The up-conversion luminescence silicon dioxide aerogel is formed by compounding a rare earth doped up-conversion luminescence material and a silicon dioxide aerogel; and the rareearth doped up-conversion luminescence material is a NaYF4:Yb/Er micro-tube and/or a NaYF4:Yb/Er micro-rod. The nano-porous material silicon dioxide aerogel is used as a display matrix material, thesilicon dioxide aerogel is transparent, the existence form of NaYF4:Yb/Er is micro-tube and/or micro-rod, and the NaYF4:Yb/Er is uniformly compounded with the silicon dioxide aerogel. The up-conversion luminescence silicon dioxide aerogel has good up-conversion luminescence performance under 980 nm laser irradiation, emits macroscopic green light, has an optical waveguide effect, and can be used in the field of up-conversion luminescence anti-counterfeiting excited by near-infrared laser.

The invention relates to a rare earth doped niobate single-crystal up-conversion luminescent material and a preparation method thereof, and relates to the technical field of up-conversion luminescentmaterials. The method comprises the following steps: A, preparing a polycrystalline material having a theoretical composition of yEr-K<x>Na<1-x>NbO<3> according to a molar ratio; B, preparing a crystal growth starting material according to a molar ratio; C, putting the crystal growth starting material into a growth crucible, and growing a Er-KNN single crystal by using a top seed crystal growth method at a temperature of 1000-1400 DEG C; D, performing annealing on the Er-KNN single crystal; and E, testing up-conversion luminescence properties of the product. The method provided by the invention can grow the large-sized Er-KNN single crystal, in particular, the up-conversion luminescence characteristics of the product disappear after vacuum annealing at a temperature of 400-600 DEG C, and the up-conversion luminescence intensity of the product is enhanced by nearly 20 times after oxygen annealing at a temperature of 700-800 DEG C; therefore, the Er-KNN single crystal provides a solid technical material basis for the fields such as oxygen sensors and optical waveguides.

The invention discloses an antibacterial wound dressing based on a visible light up-conversion material and a preparation method of the antibacterial wound dressing. The dressing takes a chitosan filmas a carrier, a large number of Y2SiO5: Pr < 3 + > and Li < + > particles are embedded in the chitosan film. The dressing utilizes a large number of amino groups on a natural polymer material chitosan (CTS) to kill bacteria, and a rare earth up-conversion material is added on the basis. As a unique optical material, the rare earth up-conversion material can realize anti-Stokes luminescence, continuously absorb two or more low-energy photons to transition to a higher energy level, and when the photons return to the ground state, they can emit short-wavelength visible or ultraviolet light.

The invention relates to a rare earth probe capable of carrying out target recognition of lung squamous cell carcinoma, and a preparation method and application thereof. The rare earth probe is a core-shell structure formed by coating a lanthanide fluoride oxide containing an up-conversion luminous element with a lanthanide fluoride oxide containing a near-infrared second-region fluorescent imaging element, and a structure general formula is: ReOF:Ln@ReOF:Ln', wherein Re, Ln, and Ln' are all lanthanide elements. The rare earth probe has good up-conversion luminescence performance and near-infrared second-region fluorescence performance at the same time, is relatively strong in fluorescence intensity, has adjustable up-conversion fluorescence color, can realize dual-mode imaging effects, isa nano-probe with excellent fluorescence performance, and has good luminous effects.

The invention belongs to the technical field of photoluminescence and solar cells, and particularly provides an Er-Yb-codoped A12O3-Ag bilayered upconversion luminescence thin film and a preparation method thereof. The preparation method comprises the steps that a bilayered thin film is prepared on a quartz or silicon substrate, an Er-Yb-codoped A12O3 thin film serves as the bottom layer, deposition is performed by adopting a radio frequency sputtering technique, an A12O3 ceramic target inlaid with an Er sheets and a Yb sheet is adopted as a sputtering target, and the Er-Yb doping amount is controlled by controlling the area and sputtering power of the Er sheet and the Yb sheet at a sputtering region; a noncontinuous Ag film serves as the top layer, deposition is performed by adopting a direct-current magnetron sputtering technique, an Ag target is adopted as a target, and an Ag film with different surface appearances can be obtained by controlling the A g sputtering power and time. Compared with an Er-Yb-codoped A12O3 single-layer thin film, the prepared double-layer thin film has the obviously-enhanced upconversion luminescence performance. The preparation method is good in technological stability and high in repeatability and has the industrial production prospect.

The invention discloses a high-temperature optical sensing material, i.e., erbium-ytterbium-codoped lead-free fluogermanate glass. Through adding erbium and ytterbium ions into fluogermanate glass, high doping of the erbium and ytterbium ions in the fluogermanate glass can be achieved, the energy utilization efficiency and luminescence efficiency of pumping can be further increased, high-sensitive temperature sensing can be achieved in relatively short optical fibers, and the practicability of temperature sensors is improved. Compared with the former erbium-doped optical glass sensing materials, the erbium-ytterbium-codoped lead-free fluogermanate glass disclosed by the invention has the advantages that inherent disadvantages of fluoride glass, sulfide glass and silicate (borate) glass as optical sensing materials are overcome, the working ceiling temperature and temperature sensing sensitivity are relatively high, and the erbium-ytterbium-codoped lead-free fluogermanate glass can be extensively applied to the field of microwave heating and temperature measurement through being made into optical fibers.

The invention belongs to the technical field of rare earth luminescent materials, and discloses a Gd < 3 + >-doped micron crystal material and a preparation method and application thereof.The micron crystal material is obtained by doping Gd < 3 + > with a Y site of a matrix material LiYF4: Yb < 3 + >/Ho < 3 + > micron crystal, and the doping concentration of Gd < 3 + > is smaller than or equal to 60 mol% of the total amount of rare earth elements in the micron crystal material; the preparation method comprises the following steps: dispersing the dispersing agent in a water solvent, sequentially adding the rare earth element source and the matrix source, uniformly mixing, and preserving heat at 210-250 DEG C for 24-60 hours to obtain the micron crystal material. Gd < 3 + > is used for replacing part of Y < 3 + > in the LiYF4 crystal, so that lattice distortion of the LiYF4 crystal is realized, the field symmetry of the crystal is reduced, the transition probability and the number of excited state particles of Ho < 3 + > are increased, energy transfer between Yb < 3 + > and Ho < 3 + > is accelerated, and up-conversion luminescence of Ho < 3 + > is enhanced.

The invention belongs to the technical field of light-emitting materials and particularly relates to a rare-earth doped upconversion nanocrystalline light-emitting material and a preparation method thereof. The chemical formula of the rare-earth doped upconversion nanocrystalline light-emitting material is NaYF4:Yb/Tm(x/y mol%), wherein x=20, and y=0.2. The rare-earth doped upconversion nanocrystalline light-emitting material is in a pure hexagonal phase and of a snowflake shape and has large specific surface area. Test results show that the rare-earth doped upconversion nanocrystalline light-emitting material has good upconversion light-emitting performance under the excitation of 980-nanometer near infrared light and is high in conversion light-emitting efficiency. The preparation methodhas the advantages that the rare-earth doped upconversion nanocrystalline light-emitting material is prepared by co-doping sensitizer Yb<3+> and activator Tm<3+> in host material NaYF4 which is low in phonon energy and high in chemical stability, the rare-earth doped upconversion nanocrystalline light-emitting material is obtained by the co-precipitation of yttrium acetate, ytterbium acetate, thulium acetate, NH4F and NaOH in solvent oleic acid (OA) and 1-octadecane (ODE), low crystallization temperature is achieved, crystal growth can be achieved at 220 DEG C, and efficiency and safety are achieved.