103results about How to "Stable Luminescence" patented technology

The invention relates to a method for quickly preparing carbon quantum dots emitting blue light and carbon quantum dots emitting green light. According to the method, an environmentally-friendly hydrothermal synthesis method is adopted, L-ascorbic acid and ethidene diamine serve as raw materials, deionized water serves as solvent, the carbon quantum dots emitting the blue light and the carbon quantum dots emitting the green light are formed by quick synthesis of the L-ascorbic acid at different temperatures, the purity of products reaches 99%, the water solubility reaches 99.5%, the particle diameter of the carbon quantum dots emitting the blue light is smaller than or equal to 6 nm, the particle diameter of the carbon quantum dots emitting the green light is smaller than or equal to 6.2 nm, and the carbon quantum dots are good in dispersity, good in water solubility, good in fluorescence, capable of being applied to fluorescence probes, biomedical imaging, printing inks and photovoltaic devices; the preparation method is advanced in process, precise and detailed in data, high in preparation speed, good in product purity and stable in light-emitting performance and is a very ideal method for quickly preparing the carbon quantum dots emitting the blue light and the carbon quantum dots emitting the green light.

The invention discloses a functionalized metal-organic framework compounds, complexes formed therefrom, and methods of preparation and use thereof, wherein the molecular formula of the functionalizedmetal-organic framework compound is C36H22N7O4Zn, and the complex is formed by self-assembling tetra(4-(3-(4-carboxyphenyl)-2,3,4-triazole)-phenyl)ethylene as the main ligand, 4-4'-bipyridine as an auxiliary ligand and zinc nitrate. A LIFM-WZ-6 has high fluorescence quantum yield and two-photon absorption cross section, and has the advantages of high emission intensity and stable luminescence performance. A large amount of small cationic dyes can be adsorbed to achieve the purpose of adjusting the luminescence properties by single-photon and two-photon excitation and realize the emission of white light. The LIFM-WZ-6 does not mercury, is non-toxic, non-volatile, easy to recycle, and environmentally friendly; the composite can adsorb different kinds of cationic dyes with different contentsto obtain light emitting complexes with different light colors and luminosity, so that the light colors of the light emitting complexes can be more easily adjusted and the light color conversion can be realized.

The invention relates to a preparation method of a metavanadate nano crystal / polymer composite fluorescent screen. Nitrate is used as a precursor; polyacrylamide gel is first prepared and treated with low temperature calcination to obtain alkali metal metavanadate nano crystal white light material; then a styrene-methyl methacrylate copolymer is compounded with the nano crystal to obtain a composite fluorescent microballoon; and a solution spin coating method is employed to prepare a composite fluorescent film, which illuminates green and white lights and has a film thickness no more than 60mm. The composite fluorescent screen can be applied to panel display and white light diode, has a good purity reaching 98%, a high luminescence internal quantum efficiency reaching 86% and stable luminescent properties, and can emit green and white light with a color coordinate of x equal to 0.3117 and y equal to 0.4259. The preparation method with an advanced technology, accurate parameters and no environmental pollution is an ideal method for preparing an organic / an inorganic composite luminescent material.

The invention discloses a photoluminescent composite material and a preparation method and application thereof. The preparation method includes: adopting a diffusion method to prepare organic peroskite nanoparticles; mixing the organic peroskite nanoparticles with organosilicon resin to obtain the photoluminescent composite material. A photoluminescent thin film stable in property can be formed by coating the photoluminescent composite material to form a film and drying for curing the film. The preparation method is simple, and the photoluminescent thin film is stable in performance and has wide application range.

The invention provides a method for preparing blue emission carbon quantum dots. According to the method, carbon quantum dots are synthesized by a microwave method, and dehydration-condensation reaction generated under the microwave effect between amino acid and ethylene glycol is utilized to form carbon quantum dots. The method is a one-step preparation method, is quick, efficient and simple. Furthermore, the invention further develops application of the blue emission carbon quantum dots in oneness detection of antibiotics, and provides a novel method for quantitatively detecting metronidazole. The aim of quantitative detection can be achieved by utilizing optical sensing between metronidazole and carbon quantum dots, and the method is quicker, simpler, more convenient and more intuitive than other methods.

The invention discloses an ytterbium ion Yb<3+> activated borotungstate upconversion luminescent material and preparation thereof. The chemical composition is shown in a general formula R3-3xYb3xBWO9, wherein R is one or more of rare earth Er<3+>, Eu<3+>, La<3+>, Y<3+>, Ce<3+>, Tm<3+>, Pr<3+>, Nd<3+>, Sm<3+>, Gd<3+> and Tb<3+>; and x is the mol percent of the doped Yb<3+>, and 0.0001<x<=1.0. The upconversion luminescent material provided by the invention is prepared by a high-temperature solid-phase method or a chemical synthesis method; the material is high in chemical purity, good in luminous mass and stable in performance; under the excitation effect of infrared laser of 975 nanometers, the material can realize green upconversion luminescence; and the luminescent intensity of the material can be increased with the increase of the energy intensity of an excitation diode. Besides, the preparation process of the material is simple and pollution-free, and is suitable for industrial production.

The invention provides a panchromatic adjustable long-life room-temperature phosphorescent material and a preparation method thereof. The long-life room-temperature phosphorescent material is a compound composed of boron oxide polycrystals and carbon dots, wherein the carbon dots are generated in situ and are uniformly dispersed and embedded in the boron oxide polycrystals, and the boron oxide polycrystals are blocky polycrystals generated by in-situ dehydration of boric acid molecules. According to the invention, the long-life room-temperature phosphorescent material has a panchromatic adjustable long-life room-temperature phosphorescent color, and the phosphorescent color can be adjusted from blue to red to cover the whole visible region; and the average decay life of the long-life room-temperature phosphorescent material can reach 113.90-581.76 ms in a room-temperature air environment, the maximum decay life can reach 1311.07 ms in a 77K vacuum environment, the afterglow time which can be distinguished by naked eyes can reach 5-12 s in the room-temperature air environment, and the long-life room-temperature phosphorescent material is stable in phosphorescence luminescence performance and can be stored for a long time.

The invention discloses a luminous brick which contains luminous fibers and concrete, wherein the luminous fibers are uniformly arranged in the luminous brick. The luminous brick disclosed by the invention can be designed into diversified luminous patterns so as to be decorated on the ground, wall surfaces and various patterns, and can maintain excellent bearing capacity. Meanwhile, the inventionfurther discloses a preparation method of the luminous brick. By changing the mold structure, simplifying optical fiber penetration and uniformly distributing and positioning, the fiber planting speedand quality of the luminous fibers are improved; and an effect of improving the adhesive structure compactness and bearing capacity among prefabricated luminous concrete bricks is achieved, so that the luminous brick is stable in luminous performance, excellent in durability, high in pressure-bearing strength, stable in structure and long in luminous duration.

The invention discloses ground limestone-based bismuth and europium co-doped yellow fluorescent powder. According to the fluorescent powder, ground limestone is used as matrix, EU<3+> is used as an activating agent, Bi<3+> ions are used as a sensitizing agent, and alkali carbonate is used as a fluxing agent and a charge compensation agent; and the molar ratio of ground limestone to EU<3+> to Bi<3+> to M2CO3 is 100:(1-5):(1-15):(0.5-2.5), wherein M is one or more of Li<+>, Na<+> or K<+>. The invention also discloses a preparation method for the ground limestone-based bismuth and europium co-doped yellow fluorescent powder; and the preparation method comprises the following steps of: accurately weighing raw materials, fully grinding the raw materials in a ball grinding mill, mixing uniformly to form powder and thus obtaining precursor, pre-treating in a high-temperature furnace, grinding, calcining the precursor at CO2 atmosphere of standard atmospheric pressure, and grinding to obtain a sample. The provided preparation method for the fluorescent powder is simple, and the fluorescent powder is stable in performance, and high in luminous intensity and has important application value.

The invention aims to quantitatively detect chloramphenicol by utilizing photobacterium leiognathus (YL). In the invention, the photobacterium leiognathus (YL) from marine environment is separated andpurified, and the photobacterium leiognathus is a gram-negative bacillus. China Center for Type Culture Collection (CCTCC) is authorized to preserve the photobacterium leiognathus strain on December27, 2006 with a preservation number of M 206139. The 16S rDNA gene sequence of the photobacterium leiognathus strain is submitted to the CenBank database with an access number of EF017227. The invention establishes a method system for quantitatively detecting the chloramphenicol by utilizing the characteristics of quick growth, stable luminous performance, low requirement on nutrition and sensitivity to the chloramphenicol of the photobacterium leiognathus strain and the characteristic that the concentration of the chloramphenicol is in a direct proportion to the luminous intensity suppressionratio of the photobacterium leiognathus strain through selecting indexes of an optimal detection wavelength, an optimal growth state, initiative luminous intensity, reaction time, reaction temperature, and the like so as to realize the quantitative detection of the chloramphenicol. The requirement on the quick quantitative detection of the chloramphenicol can be met by utilizing the characteristics of low cost, simple operation, high sensitivity, and the like for detecting the chloramphenicol of the invention.

The invention relates to a red perovskite quantum dot with stable luminescence property, and a preparation method thereof. The chemical formula of the material composition of the red perovskite quantum dot is CsPbBrxI3-X, wherein x is greater than 0 and less than 3. The preparation method of the red perovskite quantum dot uses a short-chain metal organic salt for replacing oleic acid added in theprocess of preparing quantum dots by a traditional thermal injection method, the addition of the organic short chain passivates the surface of the perovskite quantum dot and remarkably improves the stability of the red perovskite quantum dot, and the luminous intensity and the stability are greatly improved compared with those of a red quantum dot prepared from traditional oleic acid. The preparedquantum dot is dispersed in n-hexane, has good dispersibility, and is easy for subsequent QLED packaging. The red perovskite quantum dot is stable in luminescent property and high in luminescent intensity, and the stability of the red perovskite quantum dot to oxygen and water vapor is higher than that of the red perovskite quantum dot prepared by the traditional thermal injection method.

The invention relates to a method to prepare a transparent humidity resistant covering electroluminescence powder, realizing its preparation by the combination of sol-gel method and hydrolysis method. The invention has simple equipment and operation, low cost, the humidity resistant film formed on electroluminescence powder is average, and the transmission of light and electric performance are both outstanding, the electroluminescence powder processed by the invention stable performance, prolonged service life. It is a new method easy to be produced in large scale.

The invention discloses a noctilucent shell fabric which is compounded from a polymer noctilucent material and cloth and is composed of two layers of materials, wherein the two layers of materials are respectively a common material layer and a noctilucent material layer; the common material layer is positioned at the outer side and is woven by pure cotton, pure silk and pure hemp in a blending way and used for realizing the warming function of dress fabrics; and the noctilucent material layer is positioned at the inner side, is made of a polymer material and is provided with a plurality of noctilucent cavity holes. The noctilucent shell fabric has the beneficial effects of good air permeability, good hand feel, low possibility of fading, low possibility of losing color and the like, and can be cleaned. The shell fabrics which are processed and are not processed do not have essential difference without affecting shell fabric texture; the processed shell fabric is nontoxic and harmless, is free of radioactivity, can keep lighting for more than 10 hours, can be reused unlimitedly, and has stable lighting performance.

The invention aims at providing a Photobacterium leiognathi YL bacterial strain deriving from marine environment and quantitative detection on environmental pollutants by using the bacterial strain. In the invention, the luminous bacterial YL deriving from the marine environment is obtained by separating and purifying, is Gram-negative bacilli, and is rhabditiform. The luminous bacterial YL is identified to be Photobacterium leiognathi according to a phylogenetic tree established by a 16SrDNA sequencing result and a physiology and biochemistry result. The Photobacterium leiognathi YL is preserved in China Center for Type Culture Collection (CCTCC in short) with a collection number of M 206139. The 16SrDNA gene sequence of the luminous bacterial is submitted to GenBank nucleotide sequence database with the accession number of EF017227. The bacterial strain has the characteristics of rapid growth, stable luminous property, low requirements for nutrients, and sensibility to the environmental pollutants, and the like; the luminous intensity thereof is confirmed to form a maximum peak at 474 nm by fluorescence scanning; and the luminous intensity inhibition ratio thereof is in direct ratio to the concentration of multiple tested environmental pollutants, thereby the quantitative detection of the tested environmental pollutants can be realized. The invention has the characteristics of low cost, simple and convenient operation, high sensitivity and the like on detecting the environmental pollutants, , thereby satisfying the requirements on rapid detection of the pollutants.

The present invention belongs to the technical field of organic photoelectric materials, and discloses a benzotriazolyl-containing copolymer, a preparation method and an application thereof. The benzotriazolyl-containing copolymer has the following general formula (I), wherein R1 and R2 are respectively C1-C20 alkyl, and n is an integer of 10-100. The benzotriazolyl-containing copolymer of the present invention has the following advantages that: a synthesis process is simple, manufacturing cost is reduced, and mass production of the benzotriazolyl-containing copolymer can be achieved; and electroluminescent devices of the benzotriazolyl-containing copolymer have characteristics of high purity and stable luminescence performance, and can be used as red-light emitting polymers.

The invention discloses a transparent ceramic material with mechanoluminescence property and a preparation method of the transparent ceramic material, aims to provide a pressure sensing material withthe mechanoluminescence property and belongs to the technical field of the transparent ceramic material. The general formula of chemical composition of the transparent ceramic material is Se(10-y-z)Al(6-x)BxO19:yEu<2+>,zRe<3+>, wherein Re is one or combination of more than one of Dy, Gd and Nd, value ranges of x, y and z are as follows: x is larger than or equal to 0.1 and smaller than or equal to0.5, y is larger than or equal to 0.01 and smaller than or equal to 0.05, and z is larger than or equal to 0.01 and smaller than or equal to 0.05. The luminescence center of the transparent ceramic material is Eu<2+> ions, and the mechanoluminescence effect of the transparent ceramic material can be effectively enhanced by introducing rare earth impurity ions such as Dy<3+>, Gd<3+> and Nd<3+>. The transparent ceramic material has the characteristics of high compressive strength, remarkable mechanoluminescence effect and the like and can be applied to pressure sensing components in pressure sensors.

The invention discloses a manganese complex luminescent material as well as a preparation method and application thereof. The chemical structural formula of the luminescent material is [(C7H10N)2]MnBr4. The preparation method comprises the following steps: synthesis of a MnBr2.4H2O[(C7H10N)2]MnBr4 complex from N-ethylpyridine bromide (C7H10NBr) and manganese bromide tetrahydrate; purification of the [(C7H10N)2]MnBr4 complex; and finally, single crystal culture of the [(C7H10N)2]MnBr4 complex to obtain a transparent single crystal, i.e., the manganese complex luminescent material. The manganese complex luminescent material has application value in preparation of scintillators for X-ray scanning imaging, and has ultrahigh quantum yield.