47results about How to "Luminous color adjustable" patented technology

The invention discloses fluorescent carbon quantum dots extracted from eggs. The carbon quantum dots are natural and non-toxic, low in material price, strong in fluorescence-emission spectrum and stable in performance, light-emitting color can be adjusted along with excitation wavelength, and the fluorescence efficiency is high in multiple solutions. The fluorescent carbon quantum dots extracted from the eggs provided in the invention are prepared by the following steps of: a, completely separating fresh egg white and yolk by virtue of an egg white separator and placing the separated egg white and yolk in a refrigerator for cold storage before use; b, placing the separated egg white / yolk in a glass dish and conducting bulk treatment on the separated egg white / yolk directly via a long-temperate plasma to obtain a black solid product; c, dispersing the black solid product in solvent, magnetically stirring and conducting ultrasonic treatment to uniformly disperse the sample; and d, conducting centrifugation on the obtained turbid liquid, removing sediment, separating liquid supernatant by virtue of an ultra-filtration membrane, collecting filtrate and drying to obtain the fluorescentcarbon quantum dots.

The invention relates to a preparation method of fluorescence carbon quantum dots. The preparation method comprises the following steps: a first step, collecting plant leaves, washing the leaves and drying the leaves in the air; a second step, burning the clean leaves to obtain a black solid; a third step, grinding the black solid into a powder, and dispersing the powder in a solvent to obtain a well dispersed suspension through magnetic stirring and ultrasonic treatment; a fourth step, centrifuging the suspension or carrying on a separating process using a filter membrane, removing precipitation to obtain a clear solution; and a fifth step, removing the solvent in the clear solution, then obtaining the solid of the fluorescence carbon quantum dots. According to the invention, a variety of the plant leaves can be employed as raw materials, sources of the raw materials are wide and preparation processes of the method are simple and easy.

Present invention relates to an organic light-emitting film electrochemical deposition preparation method and application in preparing electroluminescence device, belonging to organic luminescence field. Said Light-emitting film is formed by electrochemical deposition in electrolytic bath, the monomer for electrochemical polymerization formed by chemical bond connecting electricity activity unit and luminescence unit, wherein electricity activity unit consisting of carbazole, thiophene, pyrrole, ethene, ethyne or phenylamine, diphenylamine, and triphenylamine, luminescence unit being cinnamic dimer, tripolymer, tetramer or terphenyl, quaterphenyl, quinquephenyl, tetracene, pentacene, fluorene dimer, tripolymer or tetramer and terpyridyl (dipyridyl ) rhenium etc, prepared electroluminescence device having simple technology, high device luminous efficiency, easy control area adjustable luminous color etc advantages.

The invention discloses a preparation method of water-soluble fluorescent carbon quantum dots based on eggshell membranes and application of the carbon quantum dots in preparation of a nanogold and carbon quantum dot composite nanomaterial. The method particularly comprises the following steps that the eggshell membranes are stripped, cleaned and dried; a certain quantity of the eggshell membranes are dispersed in an alkaline solution, the dispersed solution is transferred into a hydrothermal synthesis kettle, and reacting is conducted under the condition of 150 DEG C to 210 DEG C for 6 h to 18 h; centrifugal dialysis treatment is conducted, a carbon quantum dot solution is obtained, the carbon quantum dot solution is mixed with a chloroauric acid solution, temperature-controlled reacting is conducted for a period of time, and the nanogold and carbon quantum dot composite nanomaterial with good dispersity is obtained. According to the preparation method and application of the water-soluble carbon quantum dots based on the eggshell membranes, the raw materials for synthesizing the carbon quantum dots are low in price and easy to obtain, the method is simple, the product is good in water solubility and can be used as a reducing agent of gold nanoparticles, and usage of an external toxic reducing agent is avoided. The prepared carbon quantum dots and nanogold and carbon quantum dot composite nanomaterial can be applied in the fields of sensing detection, bioimaging and catalytic conversion.

The invention discloses a fluorescently-labeled hydroxyapatite hollow microsphere and a preparation method thereof. The fluorescently-labeled hydroxyapatite hollow microsphere has a chemical formula of Ca (1-x) Rex (PO4) 0.6 (OH)0.2, wherein x is 0.005-1 and RE is one or several of Eu, Er, Ho, Pr, Tm, Sm and Tb; the outside diameter of the microsphere is 100-600mu m; and the wall thickness of the microsphere is 30-100mum. The preparation method comprises the following steps: preparing a mixed solution of calcium salts and RE (NO3)3 and phosphate solution or phosphoric acid; then fully mixing the mixed solution and the phosphate solution or phosphoric acid under ultrasonic treatment; adding an aqueous water of sodium carboxymethylcellulose; impregnating a styrene microsphere; and carrying out drying, thermal treatment and sintering to obtain the fluorescently-labeled hydroxyapatite hollow microsphere. According to the fluorescently-labeled hydroxyapatite hollow microsphere, the luminous colors and strength adjustment of the microsphere can be realized, so that the fluorescently-labeled hydroxyapatite hollow microsphere has higher application flexibility; according to the preparation method, due to the selection of hydroxyapatite and rare earth ions which have relative-favorable biocompatibility, the problems of fluorescence decay and the like caused by change of an organic structure are solved while environment pollution or physiology toxicity can be avoided.

The invention discloses quantum dots modified by a macromolecular monomer. According to the quantum dots, the macromolecular monomer which is prepared through catalytic chain transfer polymerization is taken as a ligand; and the quantum dots have the characteristics of narrower fluorescence emission spectrum, high luminous efficiency and high stability. Particle sizes of the quantum dots modified by the macromolecular monomer are 2 to 20nm, the quantum dots are water-soluble, the quantum yield is 20 to 95 percent, the half-peak width of a photoluminescence spectrum is 20 to 80nm, and the fluorescent quantum dots are one of ZnxCd1-xS, ZnxCd1-xTe and ZnxCd1-xSe, wherein x is more than or equal to 0 and less than or equal to 1; and the macromolecular monomer used as the ligand is one of polymethylacrylic acid, polyacrylic acid, poly(hydroxyethyl methacrylate), poly(2-Hydroxypropyl methacrylate) or a polymethylacrylic acid-b-poly(butyl acrylate) block copolymer, and the molar ratio of the macromolecular monomer to metal ions is (0.5:1)-(5:1).