33results about How to "Wide excitation range" patented technology

The invention discloses a phosphor material for a near infrared LED. The phosphor material is MBO3:xCr, wherein M is at least one of Sc, Al, Lu, Gd and Y, and x is not less than 0.005 and not more than 0.2. The phosphor material is prepared from the following raw materials: an oxygen-containing compound of Cr, an oxygen-containing compound of Sc, Al, Lu, Gd and Y, one of H3BO3 and B2O3; the raw materials are calcined after being mixed directly and uniformly, or a reaction fusing assistant is added into the raw materials, and after the raw materials and the reaction fusing assistant are fully mixed, the obtained mixture is calcined; post-processing treatment is conducted on the calcined product, the phosphor material is obtained. Compared with the prior art, the phosphor material provided by the invention is stable in chemical property and excellent in light emitting performance, can be efficiently excited by blue light of 420-520 nm and emit near infrared light in the range of 700-920nm; a preparation method of the phosphor material is simple, easy to operate, free of pollution and low in cost.

The invention discloses a fluorescent powder material for a near-infrared LED (Light Emitting Diode) and a preparation method thereof. A chemical expression of the fluorescent powder material is R(1-y)X(3-x)(BO3)4:xCr, yYb, wherein R is at least one of La, Lu, Gd, Y and Nd, X is at least one of Al, Ga and Sc, x is greater than or equal to 0.005 and is smaller than or equal to 0.5, and y is greaterthan or equal to 0.005 and is smaller than or equal to 0.2. The preparation method of the fluorescent powder material comprises the following steps: (1) weighing raw materials according to chemical compositions and chemical dosage; (2) firing after directly and uniformly mixing the raw materials, or fully and uniformly mixing and firing after adding a reaction fluxing agent, thus obtaining a roasted product; (3) carrying out aftertreatment on the roasted product, thus obtaining the fluorescent powder material. The fluorescent powder material prepared by the invention is stable in chemical property and good in luminescent property; the preparation method is simple and easy in operation, is pollution-free and is low in cost.

The invention discloses a backlight module and liquid crystal display equipment and relates to the technical field of liquid crystal display. By means of the backlight module and the liquid crystal display equipment, the utilization rate of quantum dot materials in the backlight module can be effectively improved, and stimulation efficiency of the quantum dot materials in the backlight module is improved. The backlight module comprises a base plate, LED light-emitting chips and a quantum dot packaging layer, and the LED light-emitting chips are arranged on the inner side of the base plate; the quantum dot packaging layer is arranged above the LED light-emitting chips, and a gap is formed between the quantum dot packaging layer and the LED light-emitting chips, reflection net points are formed in the positions, located on one sides of the LED light-emitting chips, of the quantum dot packaging layer, the transmission path of part of light rays emitted by the LED light-emitting chips is changed, then the quantum dot materials are stimulated, the stimulation range of the light rays emitted by the LED light-emitting chips on the quantum dot packaging layer is broadened, and the utilization rate of the quantum dot materials in the backlight module is raised, and the stimulation efficiency of the quantum dot materials is improved. The backlight module is applied to the liquid crystal display equipment.

The invention relates to a rare earth green long persistence luminescent material which has the following structure, the mole coefficient ratio of the matrix raw material being CaCO3 : MgO : SiO2 : CaCl2 = 7 : 1 : 4 : 1.5, the assisting solvent is B2O3, according to doping molecular fraction, weighing the oxides of Eu2O3 and Ln ions, sufficiently grinding and mixing evenly, carrying out two step sintering in reducing gases, taking out the sample for grinding, scouring, filtering and drying to obtain the final product. The obtained long persistence material has wide agitation range, which can absorb ultraviolet and visible light effectively.

The invention discloses a broadband emission fluorescent powder material and a preparation method thereof. The chemical expression formula of the fluorescent powder is Ca3Sc<2-x>Si3O12:xCr, wherein xis greater than or equal to 0.01 but is smaller than or equal to 0.1. The fluorescent powder material comprises the following preparation steps that (1) raw materials are weighed according to the chemical composition proportion of the broadband emission fluorescent powder material; (2) the raw materials are uniformly mixed, or after reaction fluxing agents are added, the raw materials and the reaction fluxing agents are uniformly mixed; then, firing is performed to obtain a roasted product; (3) the roasted product is ground into powder; after the washing and drying, the broadband emission fluorescent powder material is obtained. The prepared fluorescent powder material has stable chemical performance and excellent luminescent performance, and can be excited by a blue light LED chip for building a fluorescence conversion type LED device. The preparation method is simple; the operation is easy; no pollution exists; the cost is low.

The invention discloses a deep red phosphor material for LED plant growth lamp, which is RX3(BO3)4:yCr, wherein the R is at least one of La, Lu, Gd, Y and Nd, the X is at least one of Al, Ga and Sc, and 0.005<=y<=0.2. The phosphor material uses the following substances as raw materials: oxygen-containing compounds of Cr, oxygen-containing compounds of Cr, La, Lu, Gd, y, Nd, Al, GA and SC, and oneof H3BO3 and B2O3. The raw materials are directly mixed and then burned, or a reaction flux is added, the raw materials and the reaction flux are fully and evenly mixed, and the mixture is burned; a burned product is subjected to a post-processing process to manufacture the phosphor material. The invention provides the phosphor material with stable chemical property and excellent luminous performance which can be effectively excited by blue light (380-500 nm) and emits deep red and near-infrared light in a range of 650 nm-900 nm. The phosphor material has the advantages of simple method, easyoperation, no pollution and low cost.

The invention belongs to the field of polymers, and relates to a red fluorescence polymer, a preparation method and applications, red fluorescence powder a preparation method and applications, red fluorescence fiber a preparation method and applications, and a transferred-to-red light resin, a preparation method and applications. According to the present invention, the red fluorescence polymer isa polymer obtained by modifying a maleic anhydride copolymer having a specific general formula with a strong alkali and then carrying out heat treatment, the excitation range is between 300-640 nm, and the emission range is within the red light region of 600-750 nm; the red fluorescence polymer, the red fluorescence powder, the red fluorescence fiber and the transferred-to-red light resin have theextremely wide excitation range from ultraviolet to green light to yellow light region, have the emission range only in the red light region, and further have characteristics of low raw material cost, mature production process, no biological toxicity, no environmental pollution and diversified applications, wherein the fluorescence performances are not restricted by the solution concentration andthe solid form; the preparation method is simple and easy to perform, and is suitable for industrial production; and the product has broad application prospects in anti-counterfeiting field, bio-imaging field, light-transfer films, solar cell sealing glues, fluorescent dyes and other fields.

The invention discloses novel Cr < 3 + >-doped garnet structure near-infrared fluorescent powder and a preparation method of a near-infrared light source. The general chemical formula of the fluorescent powder is A3-yCayB2-x-zCzD3O12: xCr < 3 + >, aRE2O3 (0<x<0.5, 1 <= y < 3, 0< x + z < = 2, 0 < z < 1.5, and 0 < = a < = 0.5), wherein A is one or a combination of more of Lu, Y, Gd, La and the like;B is one or a combination of Mg, Zn, Cu, Ni, Fe, Co, Ti and the like, C is one or a combination of Sc, In, Al, Ga and the like, and D is one or a combination of Ge, Si, Ti, Sn and the like; RE is oneor a combination of more of Yb, Nd, Ce, Er and Pr; Cr<3 +> is luminescent ion. The prepared fluorescent powder can be effectively excited by blue light and ultraviolet light, and the packaged near-infrared light source has strong near-infrared broadband emission, so that the fluorescent powder can be widely applied to the fields of plant illumination, food detection and the like.

The invention discloses a brushless DC (Direct Current) motor with brushless AC (Alternating Current) composite excitation. When a stator excitation winding end adopts an AC variable frequency excitation winding, high excitation efficiency and wide excitation range at a low rotating speed are achieved; a rotor power excitation unit performs composite power excitation by using a DC winding and a permanent magnet; a stator power winding can perform excitation square wave electricity generation by adopting a three-phase or multi-phase winding; the motor running power density is great, and the running range is wide, so that brushless DC motor with the brushless AC composite excitation can be used for power generation running and electric running. The brushless DC motor with the brushless AC composite excitation comprises a stator excitation winding, a motor rotor and a stator power winding; the motor rotor comprises a rotor excitation winding, a rotary rectifier and the rotor power excitation unit; the rotor power excitation unit comprises the DC winding and the permanent magnet; the DC winding is wound on the permanent magnet, and the DC winding and the permanent magnet perform composite excitation.

The invention discloses a silicate-based phosphor material and a preparation method thereof, wherein the chemical expression formula of the phosphor material is RM1-xSi2O6:xCr, R is one or a pluralityof materials selected from Li, Na and K, M is one or a plurality of materials selected from Sc, Ga, Y and Lu, and x is more than or equal to 0.005 and is less than or equal to 0.2. According to the present invention, the prepared phosphor material has characteristics of stable chemical property and excellent light-emitting performance, can be excited by blue-light or red-light LED chips, and is used for constructing fluorescent conversion type LED devices; and the preparation method has characteristics of simple operation, no pollution and low cost.

The invention discloses novel Cr < 3 + > doped double borate structure near-infrared fluorescent powder and a preparation method of a near-infrared light source. The general chemical formula of the fluorescent powder is Y1-x-bMx (NyAlz) 3-a (BO3) 4: aCr < 3 + >, bRE (0 < x < 1, 0 < = y < 1, 0 < = z < 1, y + z = 1, 0 < a < = 0.5, 0 < b < 0.2); wherein M is one or a combination of more of Li < + >, K < + >, Na < + > and the like; N is one or a combination of more of Lu, Ga, Gd, Sc, In and the like; RE is one or a combination of more of Yb < 3 + >, Nd < 3 + >, Dy < 3 + >, Er < 3 + > and Pr < 3 + >; and Cr < 3 + > is a luminous ion. The prepared fluorescent powder can be effectively excited by blue light or ultraviolet light, and a near-infrared light source obtained after packaging has strong broadband near-infrared emission, so that the fluorescent powder can be widely applied to the fields of plant illumination, food detection and the like.

The invention discloses a segmented type intelligent vibration isolator with an impact resistance property, and relates to the technical field of vibration isolation and reduction of civil engineeringstructures. The segmented type intelligent vibration isolator with the impact resistance property comprises a rubber vibration isolation layer, an MRA vibration isolation layer and an interlayer plate shell impact resistance layer, wherein the rubber vibration isolation layer is composed of an upper cover plate, a support column A, a limit ring column A, a ring steel plate, rubber and a cylindrical partition plate; the MRA vibration isolation layer is composed of a cylindrical partition plate, a support column B, a limit ring column B, a circular steel plate, MRE, a coil A and an intermediatecover plate; the interlayer plate shell impact resistance layer is composed of an immediate cover plate, an upper magnetic isolation plate shell, a lower magnetic guide plate shell, a lower magneticisolation plate shell, a magnetic guide plate, a magnetic guide gasket, a support column C, a coil B and a lower cover plate; and the rubber vibration isolation layer, the MRE vibration isolation layer and the interlayer plate shell impact resistance layer together form the segmented type intelligent vibration isolator with the impact resistance property. A three-section design is adopted, the rigidity of the vibration isolator is continuously and uniformly changed, the vibration isolation and reduction of various excitation under the small and large displacement can be realized, and meanwhile, the design of a controllable interlayer arc-shaped plate shell enables the vibration isolator to resist the impact force and dissipate the impact energy under the condition of large load impact.

The invention relates to Sr2SiO4: Eu<2+>, N fluorescent powder and a preparation method thereof. The stoichiometric ratio of Sr to Si to Eu to N is 2: 1: x: y, wherein x is more than or equal to 0.03 and less than or equal to 0.05, and y is more than 0 and less than or equal to 0.5. The preparation method comprises the following steps of: mixing strontium carbonate, silicon oxide and europium oxide serving as raw materials uniformly, and screening and drying the mixture; nitriding the dried mixture in flowing ammonia gas flow; and crushing the product after nitriding to obtain bright yellow fluorescent powder. The N-doped Sr2SiO4: Eu<2+> fluorescent powder has wide excitation range and good effect of matching a blue light emitting diode (LED) chip; and the preparation method is simple, can conveniently realize control of emission wavelength during preparation, and is suitable for industrialized production.

The invention discloses metal silicon-based nitrogen oxide fluorescent powder and a preparation method thereof. The fluorescent powder is as shown in the general formula: M[1-x]Si2O2N2:xEu<2+>, wherein x is larger than 0 and smaller than 0.06, and M is one element or multiple elements selected from Ca, Sr and Ba. The fluorescent powder is wide in excitation range, stable in chemical and thermal properties and good in light-emitting effect; and the bathochromic shift of the peak of an emission spectrum appears along with the increment of the concentration of active ions. The invention also discloses a preparation method of the fluorescent powder, comprising the following steps of: generating silicate as an intermediate phase firstly, and then, generating a final product. The preparation method has the advantages that raw materials are simple, cost is low, operation is simple and easy, preparation temperature is low, equipment requirement is low and the like, and is capable of saving energy source and beneficial for large-scale industrial production; and the light-emitting performance of the fluorescent powder prepared by using the method is remarkably higher as compared with the traditional solid-phase one-step reaction method.

The invention discloses a sulphide red fluorescent material for a white-light LED (light-emitting diode) and a preparation method for the same, wherein the general formula of the red fluorescent material is Ca<1-x-y>AxByS: 0.05Eu<2+>, wherein x is greater than 0 and not greater than 0.05, y is greater than 0 and not greater than 0.05, A is one or more of Mg, Sr or Ba, and B is one or more of Al, Ga or In. The red fluorescent material has the advantages of being wide in excitation range, stable in chemical and thermal performances, high in light-emitting efficiency and light-emitting brightness, and the like. The invention further provides a preparation method for the red fluorescent material, comprising the following steps of: step 1, weighing a Ca-containing compound, an A-containing compound, a B-containing compound, an Eu-containing compound and sulphur powder according to the general formula as raw materials, adequately mixing and grinding, and drying to form a mixture; and step 2, placing the mixture in an atmosphere furnace, roasting in a protective atmosphere, cooling and then taking out the mixture, grinding and sieving the mixture to obtain the red fluorescent material. The preparation method has the advantages of easily getting the raw materials, being simple to operate, energy-saving and environment-friendly, and beneficial to industrialized mass production.

The invention relates to a nitrogen-containing aluminum silicate compound red luminescent material and a preparation method thereof. The molecular formula of the material is M<3-x>AlSi<6>N<11>: xEU<2+>, wherein M is one or more than one selected from a group consisting of Mg, Ga, Sr, Ba, and x is no less than 0.001 and no more than 0.05. The material is prepared from a nitrate compound containing alkaline earth metal M, Al(NO3)3, Eu(NO3)3, nanometer silica sol or nanometer silicon oxide sol, and NH4Cl. The invention has the advantages that the nitrogen-containing aluminum silicate compound red luminescent material has the characteristics of high phototransformation efficiency, a high degree of crystallization, good heat stability, a high color rendering index, etc.; the preparation method is simple to operate, can reduce reaction temperature and pressure and poses no environmental pollution in the process of preparation; and the luminescent material prepared in the invention can be cooperated with other luminescent materials and ultraviolet, near ultraviolet or blue-light LEDs to prepare novel white-light LED light sources, or be cooperated with ultraviolet, near ultraviolet or blue-light LEDs to prepare red LED light sources.

The invention provides infrared fluorescent powder for an LED (light-emitting diode), a preparation method of the infrared fluorescent powder and an infrared light-emitting device. The infrared fluorescent powder for the LED comprises an inorganic compound with the chemical formula of M4-xNO8: Crx, x is larger than 0.05 and smaller than or equal to 1.0, M is Ga or at least one of four elements of B, Al, In and Sc and Ga, and N is selected from Ge or at least one of two elements of Si and Sn and Ge; and the wavelength range of the emission peak of the infrared fluorescent powder for the LED is 850-1000 nm, and the half-peak width of the emission peak is greater than 220 nm. The infrared fluorescent powder is stable in property, high in luminous intensity, wide in excitation range, capable of being effectively excited by visible light within the range of 250 nm to 780 nm, long and adjustable in emission peak wavelength and wide in emission light coverage area so as to achieve broadband dark red and infrared light within the range of 650 nm to 1300 nm, has the advantages of being high in efficiency, excellent in thermal stability, adjustable in luminescence, wide in half-peak width and the like, and can be widely applied to the field of light emitting devices. The method can be used for constructing a broadband infrared light-emitting device.