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

The invention relates to an infrared-excited oxide up-conversion luminescence piezoelectric material of a bismuth lamellar perovskite-like structure and a preparation method thereof. The up-conversion luminescence piezoelectric material has a chemical general formula of Am-1-x-RxYbyBi2BmO3M<+3>, wherein R is selected from Er<3+>, Ho<3+> and Tm<3+>, A is selected from Bi<3>, Ca<2+>, Sr<2+>, Ba<2+>, Pb<2+>, Na<+>, K<+>, La<3+> and Y<3+>, B is selected from Ti<4+>, Zr<4+>, Nb<5+>, Ta<5+>, W<6+> and Mo<6+>, m is a positive integer not smaller than 2 and not more than 8, x is not smaller than 0.000001 and not more than 0.3, and y is not smaller than 3.0 and not more than 0.6. The up-conversion luminescence piezoelectric material is prepared by adopting a solid-phase reaction method, has the characteristics of good thermal stability, good chemical stability, easiness for synthesis, high luminous intensity and adjustable color, and can be widely applied to various aspects such as three-dimensional display, infrared detection, counterfeiting prevention, solar cells and photoelectric integration, micro-electro-mechanical systems, photoelectric sensing and the like.

The invention provides a nanomaterial and a preparation method thereof. The method comprises the following steps: drying polystyrene microspheres to obtain a polystyrene crystal template, using the polystyrene crystal as a template, and preparing different nanomaterials by a sol-gel method. TiO doped with Bi content 2 Composite precursor solution, 3DOM Bi:TiO obtained by negative pressure filling method combined with high temperature calcination 2 ; The mixed solution of citric acid and urea was processed to synthesize CDs by microwave method, and it was lyophilized and dialyzed to obtain CDs solution; the prepared 3DOM Bi:TiO 2 Mix and stir the catalyst and CDs solution to make CDs evenly dispersed in 3DOM Bi:TiO 2 in composite materials. The nanomaterial of the present invention not only has the enhanced visible light utilization rate brought by the 3DOM structure, high specific surface area, high active sites and other characteristics, but also has the excellent conductivity and excellent up-conversion effect of CDs and Bi 3+ The excellent photocatalytic performance that doping brings; The present invention adopts preferred Bi, TiO 2 , CDs ratio, the 3DOM CDs / Bi:TiO with the best photocatalytic performance was obtained 2 nanocomposites.

The invention discloses a ternary supramolecular self-assembled upconversion gel and its preparation method and application. The photosensitizer is used as a donor, and 9,10-diphenylanthracene derivatives are used as acceptors. The gelling factor self-assembles in an organic solvent through triple hydrogen bonding to prepare a ternary supramolecular self-assembled upconversion gel. This gel structure not only shortens the spatial distance between the photosensitizer and the receptor, but also makes the triplet excited The abundant hydrogen bond network in the gel can also effectively block the quenching of triplet excitons by oxygen, thus enabling efficient triplet annihilation upconversion emission under air conditions. The ternary supramolecular self-assembled upconversion gel of the present invention has excellent upconversion performance, and can be widely used in the fields of photovoltaics, photocatalysis, anti-counterfeiting and the like.

The invention provides a preparation method of a rare-earth-ion-doped yttrium fluoride green upconversion fluorescent material, which has the advantages of simple preparation technique, low heat treatment temperature and high product purity and can implement large-scale production. The method comprises the following steps: adding rare-earth acetate into a mixed solvent composed of isopropanol, ethanol and water, adding trifluoroacetic acid, and stirring uniformly to obtain a transparent sol A; drying the transparent sol A to obtain a colloid substance, carrying out heat treatment, heating from room temperature to 300-500 DEG C, keeping the temperature for some time, carrying out furnace cooling to room temperature, and grinding to obtain rare-earth-ion-doped yttrium fluoride fluorescent powder; applying the transparent sol onto a glass or silicon chip substrate by whirl coating, airing at room temperature for 15-30 minutes, drying in a drying box at 100 DEG C, carrying out annealing treatment in a high-temperature furnace, heating to 300-500 DEG C at the heating rate of 1-10 DEG C / minute, keeping the temperature, and cooling to obtain the rare-earth-ion-doped yttrium fluoride fluorescent film.

The invention relates to a red up-conversion material of oxyfluoride and a preparation method thereof. The molecular formula of the red up-conversion material of oxyfluoride is Y(5-x-y)YbxEryO4F7, wherein 0.5<=x<=2.5, and 0.05<=y<=0.25; lithium-containing compounds such as Li2CO3 and LiF are used as a fluxing agent and a spectrum regulator. The red up-conversion material of oxyfluoride provided by the invention has the advantages of stable performance, high strength, pure chroma and the like; under the 980nm laser excitation, the material can realize red up-conversion luminescence and make up for the shortcomings of few colors and varieties of the up-conversion luminous material, thereby having a good application prospect in the fields of three-dimensional display, anti-counterfeiting, medicine, high-density data storage and the like; moreover, the preparation process is finished in an air atmosphere without needing special atmosphere protection, thereby greatly reducing the production difficulty and cost and being suitable for large-scale production.

The invention provides a preparation method of size-controllable nitrogen-doped carbon quantum dots, and belongs to the technical field of nanometer material science. The preparation method of the size-controllable nitrogen-doped carbon quantum dots is characterized in that triisopropanolamine serves as the raw material, a carburizing agent is added into ethanol solvent, a solvothermal reaction is conducted, filtering and dialyzing are conducted, and a nitrogen-doped carbon quantum dot dispersion solution can be obtained; concentrating and freeze drying are conducted, and nitrogen-doped carbon quantum dot solids are obtained, wherein the size of the carbon quantum dots can be controllable by controlling the addition amount of the carburizing agent. According to the preparation method of the size-controllable nitrogen-doped carbon quantum dots, the adopted raw materials are low in price and easy to obtain, the synthesizing method is simple and convenient in technology, low in preparation temperature and controllable in operation. Triisopropanolamine not only serves as a carbon source, but also serves as a nitrogen source, and the prepared nitrogen-doped carbon quantum dots have the good fluorescence property and are expected to be applied to the fields of photoelectric materials, bioimaging, fluorescent probes and the like.

The invention discloses a titanium dioxide matrix up-conversion luminescent material excited by a multi-wavelength laser at low power, which is prepared by the steps of: uniformly mixing prepared titanium oxide, lanthanum oxide, ytterbium oxide and erbium oxide and then drying for 2-3h in a vacuum drying box; and then grinding dried materials into 200-250mu powder, loading in a crucible and covering to be placed into a calcining furnace, raising the temperature to 1300-1350 DEG C at a speed of 10-15 DEG C per minute, keeping the temperature for 1-1.5h and then cooling with the furnace to the room temperature, taking out calcined materials, and grinding the calcined materials into 250-280mu powder to obtain the titanium dioxide matrix up-conversion luminescent material. The titanium dioxide matrix up-conversion luminescent material has higher chemical stability and better mechanical strength as well as excellent up-conversion property, and can be excited by a 1064nm laser under the condition of 8mw low power.