55results about How to "Wide range of excitation wavelengths" patented technology

The invention relates to a wastewater and waste gas pollutant treatment ball loaded with composite modified nanometer TiO2. The wastewater and waste gas pollutant treatment ball comprises an active microporous ball, the composite modified nanometer TiO2 and a plant-extracted photosensitizer or strong oxidant, wherein the composite modified nanometer TiO2 and the plant-extracted photosensitizer orstrong oxidant are sequentially loaded on the active microporous ball. According to the invention, the composite modified nanometer TiO2 and the plant-extracted photosensitizer or strong oxidant are sequentially loaded on the active microporous ball, so an obtained treatment ball has an active group with high energy; the diameter and the stacking layer thickness of the treatment ball can be determined according to the pollutant concentration and variety; during waste gas treatment, waste gas can be placed in a waste gas exhaust channel; and by utilization of the maze principle, pollutants in the waste gas react with active groups with high energy and are finally converted into substances like CO2 and H2O.

The invention relates to a vanadate garnet type fluorescent material as well as a preparation method and the application thereof, belonging to the field of vanadate inorganic luminescent materials and aiming at solving the technical problem of providing a wideband-emission fluorescent material with wide excitation spectrum range and high luminescent strength. The vanadate garnet type fluorescent material comprises the components: A(2-2x)K(1+x)NxM2V3O12, wherein x is more than or equal to 0 and less than or equal to 0.1, A is selected from at least one of Ca, Sr and Ba, M is selected from at least one element of Mg and Zn, and N is selected from at least one element of Ce, Pr, Sm, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm and Bi. The fluorescent material belongs to a garnet-type structure in a cubic system and has high luminescent strength and wide excitation spectrum band, and an emission spectrum is emitted by a wideband for covering the whole visible light region. The invention can be widely used in systems of electron, information, traffic, energy sources and illumination and has more remarkable superiority in the application of fourth-generation solid luminescent devices excited by purple light or long-wave ultraviolet light emitted by purple light or ultraviolet light-emitting diodes.

The invention relates to praseodym or praseodym-europim doped strontium lithium silicate yellow-red fluorescent powder and a preparation method thereof. The fluorescent powder utilizes strontium lithium silicate as a medium, can be effectively triggered by blue light with the wavelength of 400-500nm by codope of the praseodym and europium, and has a doublet broadband transmission characteristic (the main peaks are respectively 580nm and 610nm); and the fluorescent powder can be triggered by blue light with the wavelength of 440-490nm to transmit strong red fluorescence (the main peak is a narrow band of 610nm) by single dope of praseodym. The chemical composition of the fluorescent powder has a general formula as Li2Sr1-x-ySiO4:xEu2+, yPr3+, wherein x is no less than 0 and no more than 0.02, so is y. The excitation spectrum of the fluorescent powder has good matching with a blue light LED chip, so the fluorescent powder can be used in assembly of a white light LED with a high color rendering index; and the preparation process is easy to control, and the basic equipment of the current fluorescent powder plants can be used for realizing industrialized production, thus the fluorescent powder is novel and has application potential.

The invention discloses near-infrared fluorescent powder. A general chemical formula of the near-infrared fluorescent powder is Ca3Ga(1.95-2X)In2XCr0.05Ge4O14, wherein x is greater than or equal to 0 and is smaller than or equal to 0.975. The invention further discloses a preparation method of the near-infrared fluorescent powder. The preparation method comprises the following steps that a) oxides or carbonates containing the elements of Ca, Ga, In, Cr and Ge are weighed according to the mole ratio of all the elements in the general chemical formula of the fluorescent powder, namely, Ca3Ga(1.95-2X)In2XCr0.05Ge4O14, the oxides or the carbonates are mixed and ground to obtain a mixture, and in the general chemical formula, wherein x is greater than or equal to 0 and is smaller than or equal to 0.975; b) the mixture is heated to 1100 to 1300 DEG C for calcination for 3 to 4h, and a sintering body is obtained; and C) the sintering body is cooled down to room temperature and then fully ground to obtain the near-infrared fluorescent powder. The near-infrared fluorescent powder prepared through the preparation method is wide in excitation wavelength range, high in luminous intensity, and high in stability; and an adopted high-temperature solid-phase preparation method is simple in process, easy to operate and control, high in safety, short in preparation time and high in production efficiency, the production cost is greatly reduced compared with the prior art, and the near-infrared fluorescent powder and the preparation method thereof are suitable for large-scale industrial production, application and popularization.

The invention discloses a rare-earth europium-activated single-component white-light fluorescent powder and a preparation method thereof. The chemical formula of the fluorescent powder is (Ca1-xEux)Zr(PO4)2 (0.005<=x<=0.10). The preparation method adopts a two-step solid-phase synthesis method in air, and comprises the following steps: 1. uniformly grinding and mixing CaCO3, ZrO2 and Eu2O3 used as raw materials, and igniting at the high temperature of 1100-1400 DEG C for 1-4 hours to prepare (Ca1-xEux)ZrO3; and 2. uniformly grinding and mixing the (Ca1-xEux)ZrO3 with a right amount of NH4H2PO4 or (NH4)2HPO4 or (NH4)3PO4, and igniting at the high temperature of 1100-1300 DEG C for 3-24 hours to synthesize the end product (Ca1-xEux)Zr(PO4)2. The obtained sample can emit white light under the 200-350nm ultraviolet irradiation, has wide light-emitting color range, and can cover the whole visible light wave range. By utilizing the characteristics of the fluorescent material matrix compound CaZr(PO4)2 in the crystal structure, the Eu<2+>/Eu<3+>-coactivated CaZr(PO4)2 white-light fluorescent material can be prepared in air without multiple rare earth ions or use of a reducing atmosphere. The preparation method is simple and safe, and is easy to operate and low in production cost.

The invention discloses red fluorescent powder capable of being simultaneously effectively excited by near ultraviolet and blue LED light. In the red fluorescent powder, ZnMoO4 is taken as a substrate, Eu3+ is taken as an activation center, and one or more of Li+, Na+, K+, Rb+ and Ag+ are taken as charge compensators, and one or more of Bi3+, Sm3+, Gd3+, Sc3+, Y3+, La3+, Gd3+ and Yb3+ with proper concentration are introduced to partially replace Zn so as to improve the absorption of the Eu3+ under the excitation at 395 nm and 466nm. The chemical composition general formula of the red fluorescent powder is Zn1-2x-y-zAxByMoO4:EuxBizSmw, wherein A is one or more of Li, Na, K, Rb and Ag; B is one or more of Sc, Y, La, Gd and Yb; and x is more than or equal to 0.05 and less than or equal to 0.4, y is more than or equal to 0 and less than or equal to 0.1, z is more than or equal to 0 and less than or equal to 0.1, and w is more than or equal to 0 and less than or equal to 0.05. The invention is applied to the preparation of the red fluorescent powder capable of being simultaneously effectively excited by the near ultraviolet and blue LED light.

The invention provides a nitride fluorescent powder and a preparation method thereof, and a luminescent device containing the fluorescent powder. The chemical formula of the fluorescent powder is M3-x/2(N2-x,Ox).AA1-y/3(N1-y,Oy).bD3-z/4(N4-z,Oz).cXmNn:dR, wherein the M element comprises one or more of Be, Mg, Ca, Sr, Ba and Zn; the A element comprises one or more of B, Al, Ga, La, Gd, Sc and Y; the D element comprises one or more of Si, Ge and Ti; the X element comprises one or both of Se and Te; the R element comprises one or more of Ce, Eu and Mn; and 0.0001<=x<=0.05, 0.0001<=y<=0.05, 0.0001<=z<=0.05, 2.8<=a<=3.2, 0.8<=b<=1.2, 0.0001<=c<=0.1, 0.001<=d<=0.2, 0.8<=m<=4.2, and 1.8<=n<=4.5. The fluorescent powder provided by the invention has the advantages of high luminescence efficiency and simple and feasible synthesis technique, and can be used for making high-performance luminescent devices independently or in combination with other fluorescent powders.

The invention discloses rare earth doped fluorescent powder and a synthetic method thereof and application of the fluorescent powder in LED devices, and belongs to the technical field of luminescent materials. The general chemical formula of the fluorescent powder is MS[2-y]AyO[2+y]N[2-y-4z/3]Cz:Rx. According to the compound, C<4-> is substituted for N<3->, due to the fact that the electronegativity of C is smaller than that of N, the electron cloud expansion effect of the C<4-> is more obvious than that of the N<3->, after doping is conducted, rare earth ion 5d energy level splitting is increased, Stokes shift can change, and fluorescence parameters such as fluorescent peal and full half-peak width of the powder change. By adjusting generation of the above-mentioned doped ions, fluorescent powder with different fluorescent light colors and quantum efficiency can be obtained. The invention further discloses the application of the fluorescent powder in the field of LED devices. The fluorescent powder is applied to white LED light fixtures or light-emitting components which take blue LED or purple LED as a light source and can help to increase the color rendering indexes of the devices.

The invention discloses a method for degrading phenol-containing wastewater through a modified TiO2 catalyst in a rotating disk reactor. The method comprises the following steps that 1, in-situ doping modification of a catalyst is conducted to prepare modified catalyst sol; 2, catalyst loading is conducted; 3, a uniform light source is designed and installed; 4, the phenol-containing wastewater is degraded. According to the method for degrading the phenol-containing wastewater through the modified TiO2 catalyst in the rotating disk reactor, preparation, ion doping modification and loading of the catalyst are completed in one time through a sol-gel method, and the technology is applied to the rotating disk reactor, the advantages of the technology and the rotating disk reactor are combined, and the photocatalytic degradation efficiency of the phenol-containing wastewater is improved.

The invention relates to a near ultraviolet excitation type red phosphor and a preparation method thereof, and belongs to the technical field of luminescent materials. The phosphor has a structural formula represented by (Y1-x,Gdx)1-a-b(Px,V1-x)O4:aEu<3+>,bBi<3+>; and in the formula, x is greater than 0 and not greater than 0.5, and each of a and b is greater than 0 and lower than 0.1. The design idea of the phosphor is characterized in that Eu<3+> is treated as a luminescent center, and Bi<3+> and the like are added as auxiliary activators; there is an interaction in the luminescence of the phosphor; and the addition of Bi<3+>, Gd<3+>, P<5+> and the like enhances the luminescence performance of a sample, wherein the doping of Gd<3+> can improve the luminescent color purity of the sample, the doping of P<5+> can substantially enhance the luminescence performance, and the doping of Bi<3+> can reduce the fluorescent attenuation time of the sample. The preparation method comprises the following steps: weighing reactant raw materials according to the stoichiometric ratios of all elements in the structural formula, preparing a YVO4:Eu<3+>,Bi<3+> matrix predecessor through using a solvothermal process, doping Gd<3+> and P<5+> through using a sol-gel process, drying the obtained product, grinding the product, adding a flux, carrying out ball milling and uniform mixing, calcining the obtained mixed product in a high temperature furnace, and grinding the obtained product to obtain the required phosphor which is the near ultraviolet excitation type red phosphor and can emit red fluorescence.

The invention discloses a composite antibacterial ABS material and a preparation method therefor. The composite antibacterial ABS material comprises the following ingredients in parts by weight: 100 parts of ABS, 0.3-1.2 parts of composite antibacterial agent, 1-5 parts of silane coupler, 0.2-1 part of dispersant, 1.5-2.5 parts of antioxidant and 0.5-2 parts of discoloration inhibitor. The composite antibacterial agent is prepared from the following ingredients in parts by weight: 40-60 parts of IONPURE silver-loaded antibacterial agent, 4-6 parts of chitosan, 20-40 parts of nano zinc oxide and 5-15 parts of photosensitizer CCA (chlorophyll cupric acid). Antibacterial ABS plastics disclosed by the invention are high in antibacterial performance and long in antibacterial effective period and have an obvious bacteriostasis effect on Staphylococcus aureus and Escherichia coli. The composite antibacterial ABS material has the advantages of easiness in processing, high antibacterial performance, difficulty in discoloration, excellent mechanical properties and the like.

The invention discloses a special nano photocatalyst composite material for marine ship chemical leakages. The special nano photocatalyst composite material is characterized by containing the following raw material ingredients in parts by weight: 50-70 parts of nano titanium dioxide, 15-30 parts of silica sol, 20-35 parts of phenol-formaldehyde resin, 0.8-2 parts of silver chloride, 0.1-0.5 part of platinum, 0.2-0.5 part of nano silver, 0.3-0.6 part of stannic oxide, 1-1.5 parts of zirconium oxide, 1-5 parts of tungsten oxide, 3-10 parts of magnesium chloride, 1-5 parts of manganese chloride, 3-8 parts of active carbon fibers, 0.2-0.9 part of zinc oxide, 3-8 parts of N-cetyl ethylenediamine triacetic acid, 5-12 parts of mesoporous silicon dioxide, 10-20 parts of diatomite and 20-40 parts of water. The special nano photocatalyst composite material for the marine ship chemical leakages, disclosed by the invention, can be used for treating the marine ship chemical leakages and is prompt in treatment and good in treatment effect.

The invention relates to phosphor excited at ultraviolet 250-290 nm and near ultraviolet 396 nm and a preparation method thereof, and belongs to the technical field of rare earth luminescent materials. The purpose is to provide phosphor with stable chemical performance and good luminous effect so as to meet the requirements for high-brightness high-color rendering rare earth energy saving lamps and white light LED assembly. The following technical scheme is adopted: the phosphor adopts lithium zinc phosphate as a substrate, and Zn2+ is substituted by Eu3+. The invention has the following advantages: the excitation wavelength range is wide; the luminous effect is good; double-peak emission with coexistence of orange red light and dark red light is formed; the phosphor of the invention has stable physical and chemical properties, does not react with oxygen, water, carbon dioxide and the like in environment, is heat-resistant, nontoxic, and pollution-free; the preparation method of the phosphor of the invention is simple, and easy to operate; no cosolvent is added during the preparation process, and the preparation method is suitable for industrial production.

The invention discloses white-light fluorescent powder for an LED.The general chemical formula of the fluorescent powder is Ca[0.75-x]EuxSr0.2Mg[1.05-y]Mny(Si2O6), wherein x is larger than or equal to 0.02 and smaller than or equal to 0.04, and y is larger than or equal to 0.01 and smaller than or equal to 0.03.A preparation method of the fluorescent powder comprises the steps that 1, oxides or carbonates containing Ca, Sr, Mg, Si, Eu and Mn are weighed according to the mole ratio of all the elements in the general chemical formula, mixed and ground, and a mixture is obtained; 2, the mixture is put in a reducing atmosphere to be subjected to high-temperature roasting, and a sintered body is obtained; 3, the sintered body is cooled to room temperature and then ground, and the white-light fluorescent powder for the LED is obtained.The obtained white-light fluorescent powder is wide in excitation wavelength range, high in luminous intensity, high in stability and capable of being effectively excited by specific ultraviolet wavelength to emit bright white light.A matrix adopted in the preparation method is non-rare-earth ion-doped single pure silicate, the production cost is greatly reduced compared with the prior art, the preparation technology is simple, the method is easy to operate and control, the safety is high, the preparation time is short, the production efficiency is high, and the method is suitable for industrial large-scale production, application and popularization.

The invention provides a red fluorescent powder capable of being excited by multiple wavelengths and a preparation method thereof. The fluorescent powder is a europium-doped SiO2-Y2O3-TiO2 composite material. The fluorescent powder can be excited by near-ultraviolet light with the principal wave peak of 387nm or so, blue light with the principal wave peak of 462nm or so and green light with the principal wave peak of 532nm or so to emit red light with the principal wave peak of 616nm or so. The preparation method is implemented by proportionally combining rare-earth ions and an oxide matrix material by a sol-gel process. The method is simple in technical process and easy to operate. The obtained product has stable performance and high luminescence efficiency. The product can be matched with a proper amount of green and blue fluorescent powders, and then coated and packaged outside an InGaN diode to prepare the high-efficiency white-light LED (light-emitting diode) illuminators.

The invention relates to a red luminous fluorescent powder, the formula of which is MM'aAlbOd:Mnx,Ry, wherein M is at least one of Li, Na, K, Rb, Zr, Ce and Hf, M' is at least one of Si, B, P, F, Cl and Br, R is at least one of Eu, Sm, Dy, Nd, Pr, Ho, Er, Bi and Cr and 0<=a<=10, 0.1<=b<=12, 1<=d<=25, 0.0001<=x<=0.5 and 0<=y<=0.5. The red luminous fluorescent powder in the invention is a composite oxide, prepared in high-temperature solid-phase method. The substrate contains no toxic or hazardous chemical components such as precious rare earth, cadmium and sulfer. The invention has the advantages of simple preparing process, low production cost, stable chemical properties, good luminous performance, high thermal-stability, wide excitation wavelength and capable of being effectively excited by ultraviolet light, purple light or blue light LED etc. The invention can be widely used in white light LED.

The invention relates to the technical field of fluorescent powder for LED, and in particular to a nitride fluorescent powder material and a preparation method thereof. The nitride fluorescent powder material is characterized by having a chemical formula of M2-xSi5-yAlyN8:xEu; M represents one or a combination of two selected from alkaline earth metals including Mg, Ca, Sr and Ba; and x and y satisfy the relations of: 0.01<=x<=0.3, and y<0<=1.0. The invention has the following beneficial effects: 1. the luminescent material provided by the invention is an Eu activated nitride with high quantum efficiency, stable physical and chemical properties, and excellent antidamping performance; 2. the luminescent material provided by the invention has a wide range of excitation wavelength, and can be adapted to excitation of excitation sources with various wave bands; and 3. the method omits a metal nitridation process in a conventional to greatly reduce the product cost.