106results about How to "Excellent photoluminescence performance" patented technology

The invention relates to a method of preparing a carbon quantum dot-doped sodium borosilicate glass material. The method comprises the following steps: (1) by adopting ethyl orthosilicate, boric acid and metal sodium as precursors, proportioning the following components in percentage by mass of 5-15% of Na2O, 15-30% of B2O3 and 55-80% of SiO2 to form cracking-free and complete sodium borosilicate dry gel by virtue of a sol-gel method, heating the sodium borosilicate dry gel to 400-470 DEG C in a tubular furnace under O2 atmosphere, carrying out heat preservation for more than 10 hours until the organic substances are completely removed and cooling to obtain a porous sodium borosilicate glass dry gel; (2) immersing the porous sodium borosilicate glass dry gel prepared in the step (1) in a solution of carbon quantum dot, soaking at room temperature, preserving for 6-24 hours, taking out, drying for 10-24 hours at 60-90 DEG C, placing dried porous sodium borosilicate glass dry gel in the tubular furnace, heating to 550-650 DEG C under N2 atmosphere at a heating rate of 10-30 DEG C/h, densifying, carrying out heat preservation for 10-30 hours, naturally cooling to room temperature, closing N2 to obtain the carbon quantum dot-doped sodium borosilicate glass material, wherein solvents for the solution of carbon quantum dot is toluene, ethanol or n-hexane so that the size of the carbon quantum dot is smaller than that of the porous carbon sodium borosilicate dry glue.

The invention discloses a nano structure yttrium aluminum garnet-based transparent ceramic material, a preparation method and an application thereof. A transparent ceramic made of the material is of anano composite-phase structure consisting of YAG and Al2O3, and in addition the grain sizes of a YAG crystal phase and an Al2O3 crystal phase are both smaller than 100nm. A YAG-based transparent ceramic is prepared from an amorphous block glass precursor through thermal treatment, in the thermal treatment process, a part of aluminum dioxide in the block glass precursor is reacted with yttrium oxide, then the YAG crystal phase is generated, and the generated YAG crystal phase and the residual aluminum oxide crystal phase form a composite phase nano structure. The YAG transparent ceramic material has hardness and elastic modus comparable to or even superior to those of a YAG single crystal, is optically transparent between visible light and middle-infrared bands, has excellent photoluminescence properties after light activated ion doping, and has wide application prospects in fields such as laser, fluorescence, flicking light emission, optical lenses, artware and jewelries.

The invention discloses a method for synthetizing nano zinc oxide particles by utilizing high-temperature self-propagating reaction. The method includes: mixing chemically pure Al, CuO, ZnO and ZrO2 powder with grain size of 200 meshes according to a certain proportion, filling the powder in a graphite crucible and laying a layer of pyrophoric powder on the surface of the powder, generating self-propagation high-temperature reaction by igniting the pyrophoric powder, obtaining product in a stainless steel collector disposed at a position 30-40cm above the crucible, placing the collected product into a tubular furnace for annealing at the temperature of 150 DEG C-250 DEG C for 10-30min and carrying out slow furnace cooling to obtain a final product. The synthetic method for zinc oxide nano-particles is simple in process, low in equipment requirement, high in yield, high in purity and full of industrial production value.

The invention relates to carbon material surface silicon carbide nanowhiskers and a preparation method thereof. The technical scheme is as follows: uniformly mixing silicon powder and silicon dioxide powder according to the mole ratio of 1 to (0.3-4) to obtain a silicon source; placing asphalt-based carbon fiber or carbon fiber felt in a high-temperature graphitization furnace, thermally treating for 0.5-1h at 1000-2800 DEG C in argon atmosphere, thereby obtaining a carbon source; orderly placing the silicon source and the carbon source in a graphite crucible according to the mole ratio of 1 to (0.25-4), and then placing the graphite crucible in a high-temperature carbonization furnace, vacuum-pumping to 5-20Pa, pumping in argon to normal pressure; warming the high-temperature carbonization furnace to 1200-1500 DEG C in a speed rate of 10-20 DEG C/min under the argon atmosphere condition, keeping temperature for 0.5-3h, naturally cooling to room temperature to obtain the carbon material surface silicon carbide nanowhiskers. The preparation method disclosed by the invention is simple in process, mild in reaction condition, environment-friendly; and a prepared product is excellent in optical property and electrochemical property.

The invention discloses a preparation method of an in-situ growth quantum dot optical film. The method comprises the following steps: in situ growing an organic film layer with high-dispersible quantum dots on an ITO (Indium Tin Oxide) glass substrate by a combined process technology of sol-gel and spin coating, wherein the organic film layer serves as a photoluminescence layer; then, carrying out the organic matter spin coating, encapsulation and insulation processes to finally prepare the in-situ growth quantum dot optical film with high dispersibility. The method is novel, low in preparation cost and simple in preparation process. In addition, the particle diameters of quantum dots in the photoluminescence layer are accurately controlled and dispersibility is good due to the adoption of the in-situ growth technology. According to the preparation process of the quantum dot optical film, the particle diameters of quantum dots are effectively controlled and the high-dispersible distribution of the quantum dots in the photoluminescence layer is realized by fully utilizing obstruction, regulation and control functions of the organic matters to the growth of the quantum dots, so that the photoluminescence property of the quantum dot optical film is effectively improved. Thus, the quantum dot optical film disclosed by the invention has a very important application value in a novel photoelectric display device.

The invention discloses a manganese complex serving as an X-ray scintillator material and application of the manganese complex in preparation of a flexible X-ray scintillator film. The structure of the manganese complex is shown as a formula (I). In the formula (I), R1, R2, R3 and R4 are respectively and independently alkyl or aryl groups; A is N or P; and X is F, Cl, Br or I. The manganese complex disclosed by the invention has the advantages of low preparation cost, excellent photoluminescence performance, good stability, environmental friendliness and the like.

The invention relates to the synthesis technology of new luminescent materials, and is a new-type electrically neutral tridentate iridium [III] complex red light material and a preparation method thereof. It is a 6-[5-trifluoromethylpyrazole]-2,2'-bipyridine·2,6-diphenylpyridine iridium[III] complex. Under the protection of nitrogen, the trihydrate iridium trichloride [III] metal salt reagent and 6-[5-trifluoromethylpyridine]-2,2'-bipyridine tridentate chelate ligand were heated in ethanol, and the reaction The liquid was pumped dry for recrystallization, filtered, washed, and vacuum-dried to obtain an orange-yellow solid intermediate; in a nitrogen glove box, the orange-yellow intermediate, silver trifluoromethanesulfonate, and 2,6-diphenylpyridine ligand were uniformly mixed , ground into powder, heated, after the reaction solution was cooled to normal temperature, the filtrate was collected and dried to obtain the crude product, the crude product was separated, the second orange-red eluate was collected and dried, and vacuum-dried to obtain the final product, the yield was up to 30-68%.

The invention belongs to the technical field of luminescent materials, and particularly relates to borosilicate rare earth luminescent microcrystalline glass, and a preparation method and applicationthereof. The chemical composition of the borosilicate rare earth luminescent microcrystalline glass is aMO.bLn<2>O<3>.cB<2>O<3>.dSiO<2>.eAl<2>O<3>: xBi, yGe, zRE. According to the invention, rare earth ions including RE, Bi, Ge, Al and the like are doped into the microcrystalline glass, and a crystal field around the rare earth ions is further adjusted by utilizing different ion radiuses, coordination potentials, bond types, bond lengths, coordination numbers and the like of the rare earth ions, so the control of color and luminous intensity is facilitated; and through sensitization of Bi ionsto other rare earth ions (such as Tb<3+>, Eu<3+>, Tm<3+>, Dy<3+> and the like), the microcrystalline glass has higher luminous intensity and can be applied to LED luminescent devices.

The invention provides a preparation method and application of fungal hypha nitrogen and sulfur self-doped carbon dots and belongs to the field of researches of fluorescent carbon nano-materials. Thepreparation method comprises the following preparation steps: (1) firstly, preparing fungal hyphae by utilizing a biosynthesis technology; culturing the hyphae in a PDA (Potato Dextrose Agar) solid culture medium at constant temperature; then inoculating the hyphae into a modified PDA liquid culture medium and culturing in a constant-temperature oscillator; finally, purifying the hyphae; and (2) taking the hyphae as a raw material and synthesizing the nitrogen and sulfur self-doped carbon dots (N,S-CDs) in one step under a hydrothermal condition. According to the preparation method provided bythe invention, a method combining biosynthesis and the hydrothermal condition is adopted for the first time, and the N,S-CDs with excellent performance are prepared. The N,S-CDs can be used for carrying out high-selectivity and high-sensitivity detection on tetracycline antibiotics (TCs); and when the concentration of TC is 0.5 to 38.46muM, the linear correlation coefficient is 0.991 and the TC detection limit is 0.041muM. The N,S-CDs are used for preparing fluorescence detection test paper and the fluorescence detection test paper can be used for rapidly detecting the TCs in culture wastewater. The N,S-CDs do not influence the survival rate of cells and have a very great application potential in the field of cell imaging.

The invention relates to a preparation method of a noble metal/SiO2 composite particle and semi-conductor quantum dot laminated quantum dot luminescent thin film. The preparation method comprises thefollowing steps: on an ITO glass substrate, single-layered metal nano-particles kernels are assembled to serve as a plasma excimer enhancement center, and metal nano-particles are wrapped with SiO2 housings to serve as isolating layers; and a CuInS/ZnS quantum dot semi-conductor quantum dot is taken as a photoluminescence center. The noble metal/SiO2 composite particle and semi-conductor quantum dot laminated quantum dot luminescent thin film is prepared by the spin-coating process, and the quantum dot luminescent thin film is finally prepared by the organic spin-coating and packaging processes. The preparation method is novel, low in manufacture cost and simple in preparation process, and becomes the most effective method which most probably improves the light field intensity of the semi-conductor quantum dot, improves the utilization efficiency of exciting light and accordingly improves the overall luminescence property of the semi-conductor quantum dot luminous optical film at last.

The invention discloses a copper nano cluster with high stability and near-infrared phosphorescence and a preparation method thereof, and belongs to the crossing field of coordination chemistry and nano materials. Common p-tert-butyl thiophenol and triphenyl phosphine are used as protective ligands of the copper nano cluster, the copper nano cluster with near-infrared luminescence is synthesized through a simple one-pot method at the room temperature in an air atmosphere, and the yield is high. The molecular formula of the copper nano cluster is [Cu11(SC10H13)9(PC18H15)6](SbF6)2, the copper nano cluster belongs to a monoclinic system, and the space group is P 21/n. At the room temperature, a solution and a solid of the copper nano cluster both have strong red phosphorescence, and the absolute quantum yield of the solid is 22%. At the room temperature and in an air atmosphere, a solution of the copper nano cluster has strong stability.

The invention belongs to the technical field of functional coatings and photoelectric functional films, and particularly relates to a composite functional coating and film and a preparation method andapplication thereof. A metal ion-thiocyanate aqueous solution is used as a filling solution and a doping solution, a composite solid-liquid interface system is constructed by the metal ion-thiocyanate aqueous solution and a solid film or a solid surface, and then in-situ filling or in-situ growth of a plurality of composite functional coatings and functional films is carried out. The composite coating and film are good in stability and wide in application range, and have wide applications including surface treatment, anti-corrosion treatment, weather-proof treatment, marine antifouling coatings, marine organism propagation prevention coatings and the like. Some composite functional films prepared by the invention can emit high-brightness red light under the excitation of green light, andcan be used as one of three primary color ingredients for constructing a white light emitting device (LED). The method provided by the invention is environment-friendly, and has good universality.

The invention discloses an ordered extralarge-hole-pitch alumina film and a preparation method thereof. The alumina film has high hardness and elastic modulus, low reflectivity and obvious photoluminescence performance. The surface of the film is composed of innumerable holes. The bottoms of the holes are distributed in ordered hexagons. According to the ordered extralarge-hole-pitch alumina film and the preparation method thereof, macromolecular organic acid serves as an electrolyte, the electrolyte and an aluminum base are effectively cooled simultaneously, and the aluminum base is stably oxidized under extra-high voltage. The alumina film can serve as an ideal template for preparing various ordered major-cycle nano array structures of metal, polymer and the like, and can also be used for developing three-dimensional channel alumina films of micro and nano composite structures. The major-cycle alumina film is an excellent bioactivator carrier and has wide application prospects in the aspects of biosensors, medicine transport platforms, solar cells and the like.

The invention discloses a preparation method of carbon quantum dots with a changeable color and a photothermal effect as well as a product of the preparation method and application of the carbon quantum dots. The preparation method comprises the following steps: mixing: mixing ink and water; reacting: after mixing, heating and reacting; freezing: freezing and drying to obtain quantum dot powder with the changeable color and the photothermal effect. The preparation method has the advantages of simple preparation technology and low economic cost; a surface passivating agent does not need to be added and the carbon quantum dots with the changeable color can be prepared in one step. The carbon quantum dots provided by the invention have the characteristics of color changing performance, excellent photoluminescence performance and the like, the carbon quantum dots bring a great prospect to future agriculture and are especially used for monitoring changes of cells in plants; the carbon quantum dots are dispersed in a high polymer and can be used as an anti-fake label of an agricultural film. The carbon quantum dots prepared by the preparation method have good biocompatibility, low toxicity and photoluminescence performance and can be used as a fluorescent probe in an organism. The carbon quantum dots prepared by the preparation method have the photothermal effect and can be used as acarrier for inhibiting the growth of tumors and treating the tumors.

The invention discloses a silicate luminescent material and a preparation method thereof. The chemical formula of the luminescent material is aCaO.bAl2O3.cSiO2:xCe,yTb. The preparation method of the luminescent material comprises the following steps: using at least one of oxide, carbonate and oxalate of Ca, Al2O3, SiO2 and Tb4O7 as raw materials; weighing the raw materials according to the mol ratio of elements in the chemical formula aCaO.bAl2O3.cSiO2:xCe,yTb; and evenly mixing the raw materials, heating to 1000-1500 DEG C in the reducing atmosphere, calcining at constant temperature for 4-20 hours, cooling to room temperature, and grinding to obtain the luminescent material. The silicate luminescent material is suitable for LED excitation in ultraviolet regions, and can emit green light in high efficiency. The preparation method has the advantages of simple technique and low cost.

The invention relates to photoluminescent citric acid based nanoparticles and an application and a method for living cell marking. The photoluminescent citric acid based nanoparticles have the advantages as follows: (1) the nanoparticles have excellent photoluminescent performance, can excite fluorescence imaging at the wave band of 360-480 nm and have the fluorescence quantum yield up to 15%; (2)the nanoparticles have good light stability and have the fluorescence emission spectrum not changed obviously and have high brightness after being soaked in a phosphate buffer solution and a completecell culture medium (DMED+10% fetal calf serum); (3) the nanoparticles have good biocompatibility and facilitate adhesion and proliferation of cells; (4) the photoluminescent citric acid based nanoparticles can mark stem cells and tumor cells in real time for a long time and have the marking time in vitro as long as 14 days, which is far longer than that of commercial cell markers; (5) the preparation process is simple and industrial production can be realized.

The invention relates to a preparation method for a plasma excimer enhanced quantum dot optical film. A spin coating film forming process technology is utilized, and a metal quantum dot layer acts as a plasma excimer enhancement layer, an organic high-molecular compound acts as an isolation layer and a CdSe quantum dot/organic high-molecular composite film layer acts as a photoluminescence layer respectively to prepare the plasma excimer enhanced quantum dot optical film on an ITO glass substrate. The preparation method is novel, low in manufacturing cost and simple in preparation technology. Besides, the simple spin coating process technology is adopted so that thickness of each film layer in the composite film is accurate and controllable, dispersity is great, effective control of parameters like optical field intensity distribution of semiconductor quantum dots through metal quantum dots is realized by fully utilizing high-molecular compound blocking and adjusting and control of distance between the metal quantum dots and the semiconductor quantum dots, photoluminescence performance of the quantum dot optical film is effectively enhanced, and thus the preparation method has quite important application value in novel photoelectric display devices.