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

The provided preparation method for a long-lag yellow fluorophor with nominal constituent as 2(Ca1-xEux)O.mCaBr2.nSiO2:yR (R for Ti, Zr, La, Nd or Dy; all m, n, x and y for mole coefficient, 0.8<=m <=1.2, 0.7<=n<=1.3, 0.005<=x<=0.1, and 0.01<=y<=0.2) comprises: weighing the materials and one of B2O3 or NH4Cl as fluxing agent to grind and mix fully; sintering following two steps: first, pre-sintering for 3-5h at 400-600Deg; then, sintering for 6-8h in carbon reducing atmosphere at 900-1100Deg. This product has wide activation range to absorb UV and visible light, and keeps afterglow luminescent effect for a long time.

The invention discloses a far-red and near-infrared emitting fluoride fluorescent material and its preparation and application. The chemical expression of the fluorescent powder material is R x Al 1‑y F x+3 : yCr; wherein R is at least one of Li, Na, K, Rb or Cs, 1≤x≤3, 0.005≤y≤0.2. The preparation method is as follows: 1) Weigh AlF according to the chemical composition and stoichiometric ratio of the fluorescent material 3 , CrF 3 , R-containing fluoride and NH 4 F; 2) Fully grind and mix the weighed raw materials evenly, and then burn at high temperature to obtain a roasted product; 3) Grind the roasted product into powder, wash and centrifuge, then dry to obtain the fluorescent material. The fluorescent material has stable chemical properties and excellent luminous performance, can be excited by blue or red LED chips, and has simple preparation and operation, no pollution, and low cost. type LED devices.

The invention discloses a silicate-based phosphor material and a preparation method thereof. The chemical expression of the phosphor material is RM 1‑x Si 2 O 6 : xCr, wherein R is one or more of Li, Na, K, M is one or more of Sc, Ga, Y, Lu, 0.005≤x≤0.2. The phosphor material prepared by the invention has stable chemical properties and excellent luminous performance, can be excited by blue or red LED chips, and is used to construct fluorescent conversion LED devices. Moreover, the preparation method is simple in operation, pollution-free and low in cost.

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 relates to white light fluorescent powder for deep ultraviolet LED (Light Emitting Diode), which has the chemical formula of AnxBxRE1-x-yPzV1-zO4:Dy<3+>y, wherein the RE is rare earth ions of Y<3+>, La<3+>, Gd<3+> and Lu<3+>; the A is alkali metal ions of Li<+>, Na<+> and K<+>; the B is transition metal ions of Zn<2+> and Cd<2+>; n is larger than or equal to 0 and less than or equalto 4; x is larger than or equal to 0 and less than or equal to 0.4; y is larger than or equal to 0 and less than or equal to 0.3; and z is larger than or equal to 0 and less than or equal to 1. A chemical coprecipitation method is adopted to dissolve the raw materials containing corresponding negative ions and positive ions into solutions, and the solutions are mixed to generate precipitates which are washed, dried and calcined; or a solid-phase reaction method is adopted to calcine the raw materials subjected to mixing and fully grinding to obtain single phase fluorescent powder with the same structure to the crystal structure of the matrix (RE(P, V)O4). The invention has the advantages that the luminous intensity is enhanced through the synergic sensitization of the alkali metal ions and the transition metal ions; and a wide strong excitation band is formed in the range from 250 to 350nm.

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 phosphate-based phosphor material and its preparation method and application. The chemical expression of the phosphor material is AB 1‑x P 2 o 7 : xCr, wherein A is at least one of Li, Na, K, 0.01≤x≤0.1; its preparation method is as follows: 1) accurately weigh raw materials according to the chemical dosage ratio of the above-mentioned phosphate-based phosphor material; 2) weigh The raw materials taken are mixed well and evenly, and the mixture is fired at high temperature in an air atmosphere to obtain a fired product; 3) the fired product is ground into powder, and then washed and dried to obtain the phosphate-based phosphor material. The phosphor material of the present invention can be effectively excited by the blue LED chip, and emit 750-1100nm broadband near-infrared light, has good chemical stability, excellent luminous performance, and the preparation method is simple, easy to operate, low in cost, and pollution-free. It is suitable for industrialized mass production.

The invention discloses a Ho 3+ Activated green down-conversion phosphor and preparation method thereof, the molecular formula of the green down-conversion phosphor is Ho (3‑x‑y) La x R y Ta 0.5 Ga 5.5 O 14 , where 0

The invention relates to a yellow fluorescent powder for a blue-light-excited white LED and a preparation method of the yellow fluorescent powder, belongs to the field of luminescent materials, and aims at solving the technical problems of shortage of a red-light component, high color temperature, low color rendering index and poor thermal characteristics in an existing white LED preparation method in which YAG fluorescent powder is used. The chemical composition of the yellow fluorescent powder is M1-xN2-y+xAl1-xSixO5:Euy, wherein M is La or Gd; N is Sr or Ba; x=0.10-0.90; and y=0.01-0.07. The invention further provides a preparation method of the material. An emission peak of a sample is broadband transmission of which the main peak is at 569nm under the excitation of blue light at 450nm, is closer to a yellow light zone than YAG, and is combined with a blue LED chip, so that the color temperature of the product can be reduced and the color rendering index is improved; and the product has certain popularization value in preparation of efficient luminescent materials with potential applicability for the white LED.

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.