35results about How to "Short afterglow time" patented technology

The invention discloses a rare earth oxide solid solution ceramic scintillator and a preparation method thereof. The main component of the ceramic scintillator is Gd2xLu2yY2(1-x-y-z)Eu2zO3 (the x is more than or equal to 0.1 and less than or equal to 0.6, the y is more than or equal to 0.1 and is less than or equal to 0.4, and the z is more than or equal to 0.01 and less than or equal to 0.1), and the ceramic scintillator has a crystal structure with a cubic Ia3 point group. Ceramic powder can be synthesized by a chemical coprecipitation method. The coprecipitation method adopts ammonia, ammonium hydrogen carbonate or a mixed solution of the ammonium water and the ammonium hydrogen carbonate as a precipitating agent, titrates the precipitating agent into a solution of gadolinium nitrate, lutecium nitrate, yttrium nitrate and europium nitrate to obtain a precipitate, and then the precipitate is dried and calcined to obtain nano-powder. The obtained powder is pressed into a ceramic blank through an isostatic compaction method, then the pressureless sintering is performed in vacuum or hydrogen atmosphere, the sintering temperature is between 1,600 and 1,900 DEG C, transparent Gd2xLu2yY2(1-x-y-z)Eu2zO3 ceramic can be obtained, a ceramic product with the needed dimension is prepared after the cutting, grinding and polishing, and the transmission rate of the ceramic in a visible region (400-800 nanometers) is more than or equal to 65 percent. The ceramic scintillator emits red light with a main wavelength of 610 nanometers under the excitation of ultraviolet light or X rays, and can be used for scintillating materials of imaging and detection of medical and industrial X rays.

A color display unit is provided, which allows color display to be performed with high efficiency in utilizing light as compared with a prior type using all of RGB color filters. The color display unit includes a light source section having plural kinds of color LEDs, and includes a display section controlling transmissivity of light from the light source section in synchronization with light emission control by the light source section, to achieve desired color display. The display section has a full-color transmittable region and a partially transmittable region. The full-color transmittable region allows all color components of the light to be transmitted, while the partially transmittable region inhibits passage of one or more in the color components of the light. The display section controls the transmissivity of the light independently for each of the full-color transmittable region and the partial transmittable region.

The invention provides vacuum ultraviolet induced green emitting phosphor which is characterized by having the following concrete chemical formula: M3 minus 2xBPO7: Tbx, Rx, wherein x is more than 0 and less than or equal to 0.3, R is one or several of Li, Na and K, and M is one or several of Mg, Zn, Ca, Sr and Ba. The invention also provides a method for preparing the green emitting phosphor, comprising the following steps: firstly, weighing corresponding raw materials according to the weight ratio expressed in the chemical formula; secondly, carrying out high-temperature roasting on the raw materials and rinsing coasted materials; and thirdly, carrying out separation, filtration, size grading and drying on the rinsed materials to obtain the vacuum ultraviolet induced green emitting phosphor having stable chemical property, short after time and excellent luminance.

The invention relates to zinc silicate manganese green emitting fluorescent powder and the manufacture method. It includes the following steps: adding SiO2 or silica slurry into zinc nitrate and urea water solution to make suspension, manganese sulfate solution, dropping excessive ammonia to generate precipitate; keeping temperature of precipitate in air or inert gas and gaining the fluorescent powder after processed. The feature is that the grain size is normally 1um, and has equally manganese ion distribution, and the keeping temperature declines about 200 degree centigrade. The invention has good emitting performance and persistent quality.

The invention relates to a warm white fluorescent powder excited by an ultraviolet LED. According to the fluorescent powder, InNbO4 serves as a host material, and the warm white fluorescent powder In1-x-y-zDyxTmyEuzNbO4 is obtained by simultaneously doping rare earth ions such as 0.01-0.05at.% of Dy3+, 0.01-0.05at.% of Tm+3+ and 0-0.03at.% of Eu3+ into the In3+ position, wherein x ranges from 0.01 to 0.05, y ranges from 0.01 to 0.05, and z ranges from 0 to 0.03. The rare-earth-doped niobate-based warm white fluorescent powder for the LED has the advantages of being simple in preparing process, high in light-emitting intensity, adjustable in color, capable of achieving a warm color, short in fall time, good in stability and the like, and can be widely applied to the LED field.

The invention discloses a self-activated titanoniobate-based fluorescent material and a preparation method thereof. The series of fluorescent powder is prepared by the following steps: taking GdNbTiO6 as a matrix, doping rare earth ions Eu3<+> and Dy<3+>, thereby obtaining a red fluorescent material Gd<1-x>NbTiO6:xEu3<+> and yellow green fluorescent powder Gd<1-y>NbTiO6:yDy3<+>, wherein x is equal to 0.01-0.05, and y is equal to 0.01-0.05. The process flow disclosed by the invention is safe, simple and easy to control. The prepared fluorescent material has the advantages of high chemical stability, non-toxicity, zero radiation, high brightness, high color purity, high conversion efficiency and the like.

The invention discloses a red fluorescent powder for a PDP (Plasma Display Panel) and a preparation method thereof. The chemical formula of the red fluorescent powder is (Y1-x-y-zEuxREyRz)2O3, wherein x is not less than 0.005 and not more than 0.40, y is not less than 0.005 and not more than 0.40, z is not less than 0.005 and not more than 0.10, RE is rare-earth metal and R is alkali metal. The main light-emitting ion in the red fluorescent powder disclosed by the invention is Eu<3+>. Under the excitation of vacuum ultraviolet (VUV) light, after absorbing a certain amount of energy, the red fluorescent powder can transfer the energy to the Eu<3+>; the Eu<3+> produces red emission and an auxiliary ion R results in lattice distortion of the red fluorescent powder, so that the afterglow time of the Eu<3+> can be shortened effectively; moreover, the raw material for synthesis of the red fluorescent powder is non-toxic, the preparation process is simple and the industry production is easily realized.

The invention discloses a preparation method of zinc manganese silicate fluorescent powder with short afterglow. The fluorescent powder is prepared by a high temperature solid state method, wherein the source of Mn is ZnMn2O4 instead of conventional manganese oxide or manganese carbonate or other compounds. The zinc manganese silicate green fluorescent powder prepared by the method is high in luminous intensity and short in afterglow time, thus completely meeting the requirement on 3D plasma display. The preparation method does not change existing technology of preparing the zinc manganese silicate fluorescent powder by the high temperature solid state method, thus being easy to implement industrially, and very applicable to scale production.

The invention discloses a Cr < 3 + >-doped gallium aluminate near-infrared long-afterglow luminescent material and a preparation method thereof. The general chemical formula of the near-infrared long-afterglow luminescent material is Zn3GaxAl2-xGaeTibSn2-a-bO10: yCr < 3 + >. The preparation method comprises the following steps: weighing the raw materials according to the molar ratio of the substances in the equation, adding the fluxing agent, grinding in an agate mortar, and uniformly mixing to obtain a precursor; putting the precursor into an alumina crucible, and pre-sintering in an air or neutral atmosphere; and grinding and uniformly mixing a sample obtained by presintering, and calcining in air or neutral atmosphere to obtain the Cr < 3 + > gallium aluminate near-infrared long-afterglow luminescent material. The near-infrared long-afterglow fluorescent powder disclosed by the invention has the advantages of low raw material cost, simplicity and feasibility in operation, low requirements on equipment and the like. The long-afterglow luminescent material has the advantages that the emission range is located in a near-infrared region, and the long-afterglow luminescent material is long in afterglow time and the like.

The invention relates to the technical field of ceramics, and discloses a light-emitting ceramic tile based on a co-firing method preparation process, and the preparation process thereof. The preparation process comprises a luminous particle pre-sintering step and a finished product preparation step, wherein the luminous particle pre-sintering step comprises: S1) preparing luminous slurry; S2) putting the luminous slurry into an electric furnace, and presintering at 600-700 DEG C to remove impurities, so as to obtain luminous particles; and the preparation step of the finished product comprises: P1) applying a first viscous material on the surface of a green body to form a lower viscous layer on the green body; P2) applying the luminous particles to form a luminous layer on the green body;P3) applying transparent glaze to form a transparent glaze layer on the green body, and P4) placing the green body in a kiln, and firing at 1100-1250 DEG C to prepare the luminous ceramic tile. The luminous layer can prevent liquid in the transparent glaze from eroding and damaging particles of luminous powder in a fired molten state, and the prepared ceramic product is high in luminous brightness and long in luminous life.

The present invention relates to new material, and is especially new type of green photoluminescent phosphor and its preparation. The phosphor is RE Tb activated aluminate green phosphor in the expression of M1-XAl12O19:Tb3+x, where, M is Ba2+, Sr2+ and Ca2+, and x is 0.005-0.06. The phosphor is prepared through either a solid phase process including mixing and grinding materials terbium oxide, alumina, barium carbonate and boron oxide, and roasting for over 2 hr; or a sol-gel process including dissolving barium carbonate, aluminum nitrate a RE nitrate in citric acid solution, heating and stirring in water bath to form sol, drying the sol to form loose black powder, grinding and high temperature roasting. The phosphor has short afterglow, high light emitting strength, high light emitting efficiency, and small and homogeneous grain size.

A phosphor, comprising a manganese activated zinc silicate phosphor, is comprised of particles having a major-to-minor axis ratio of 1.0 to 1.4. A method for producing the phosphor, comprising burning a phosphor material containing elements constituting a host material of the phosphor and an activator or compounds containing the elements by heating in a heating furnace while flowing or rotating them to manganese activated zinc silicate phosphor particles having a major-to-minor axis ratio of 1.0 to 1.4. Another method for producing the phosphor, comprising burning phosphor material by heating in a heating furnace while flowing or rotating them to obtain a manganese activated zinc silicate phosphor having an afterglow time of less than 9 ms. Thus, a compact phosphor layer with high packing density can be formed, and there can be obtained a phosphor capable of high-luminance green light emission upon excitation by vacuum ultraviolet rays or low-voltage electron beams. Moreover, there can be obtained a manganese-activated zinc silicate phosphor capable of emission of green light of high luminance and short afterglow time upon excitation by vacuum ultraviolet rays or low-voltage electron beams.

The invention relates to a green light-emitting fluorescent powder, which is characterized in that the chemical formula thereof is M1-x-yRexNyO, wherein M is at least one of Ca, Sr and Ba; Re is at least one of Tb and Gd; N is Li, Na or K; the value of x is more than or equal to 0.001 and less than or equal to 0.3; and the value of y is more than or equal to 0 and less than or equal to 0.3. The preparation method comprises the following steps: weighing raw materials and fluxing agents in proportion; grinding and uniformly mixing the raw materials and the fluxing agents; roasting the mixture at the temperature of between 850 DEG C and 1,300 DEG C in reducing atmosphere for 1 to 24 hours for one to three times; and grinding the roasted mixture after cooling to obtain the green light-emitting fluorescent powder. The green light-emitting fluorescent powder has the advantages of simple preparation method, no pollution, contribution to industrialized production, short afterglow time, high luminous intensity and excellent luminous performance, can be widely used in PDP or mercury-free fluorescent lamps.

The invention discloses rare earth borate-based red fluorescent powder. According to the fluorescent powder, CaInBO4 is used as a base body, 0.02-0.08 at.% of Al<3+> is doped to enter In<3+> bit, 0.02-0.08 at.% of Ba<2+> is doped to enter Ca<2+> bit and 0.07-0.10 at.% of Eu<3+> is doped to enter In<3+> bit, so that fluorescent powder (In(1-x-z), Alx, Euz)(Ca(1-y), Bay)BO4 is obtained, wherein x is equal to 0.02-0.04, y is equal to 0.05-0.07, and z is equal to 0.07-0.1. The rare earth borate-based red fluorescent powder provided by the invention has excellent properties of high luminous intensity, warm color, rapid decay, short persistence, good heat stability, easiness in long-term preservation and wide application range.

The invention relates to a low-pressure gas discharge lamp (10) for use in a scanning or blinking backlighting system, the low-pressure gas discharge lamp (10) comprising a luminescent layer (20) comprising a luminescent material selected from a group comprising: (Sr1-x-y-z, Bax, Cay, Eu(II)z)2Si04 (also known as XSO), (Sr1-x-y-z, Bax, Cay, Eu(II)z)Si2N2O2 (also known as XSON), and (Sr1-x-y-z, Bax, Cay, Eu(II)z)2Si5N8 (also known as XSN), wherein 0=x<1, 0=y<, 0<z=0.20, and x+y+z=l. The luminescent materials according to the invention have a relatively short decay time (less than 0.5 milliseconds), resulting in a relatively short afterglow time of the low-pressure gas discharge lamp (10) according to the invention. When using known low- pressure gas discharge lamps, for example, comprising the luminescent materials BAM, LAP and YOX in the scanning or blinking backlighting system, the afterglow time of these luminescent materials creates visible motion artifacts, especially when the scanning or blinking time is increased from 50 Hertz or 60 Hertz to, for example, 90 Hertz or 100 Hertz. Replacing the known luminescent materials LAP and / or YOX with luminescent material according to the invention will result in a reduction of the motion artifacts.

The invention relates to a green luminescent material and a preparation method thereof. The green luminescent material adopts a chemical formula of M1-x-y-zGdxTbyNzAl2B2O7, wherein M is at least one component among Ca, Sr and Ba, N is Li, Na and K, the value range of x meets the relationship, i.e., 0.02 Less than or equal x Less than or equal 0.3, the value range of y meets the relationship, i.e., 0.01 Less than or equal y Less than or equal 0.4, z=x+y, and 1-x-y-z>0. The preparation method comprises the following steps: weighing all the raw materials according to the proportion, then fully grinding the raw materials, presintering the ground raw materials at the lower temperature, calcining for 2 to 12 h at the temperature of 800-1200 DEG C under the reducing atmosphere, and then grinding after cooling to obtain the green luminescent material. The preparation method is simple, pollution-free and is beneficial to industrialized production; and the obtained green luminescent material is short in afterglow time and high in luminous intensity, has the excellent luminous performance and can be widely used for a PDP or mercury-free fluorescent lamp.

A green luminescent material of terbium doped gadolinium borate is provided. The luminescent material has a formula of M3Gd1-xTbx(BO3)3, wherein, M is alkaline earth metal element and x is 0.005-0.5. The method for preparing the luminescent material comprises the following steps: selecting the source compounds of alkaline earth metal ion, boric acid radical ion (BO33−), Gd3+ and Tb3+ by the stoichiometric ratio, wherein, the stoichiometric ratio is the molar ratio of the corresponding element in the formula of M3Gd1-xTbx(BO3)3, and the source compound of BO33− is over 10%-30% by the molar ratio; mixing; pre-treatment by sintering; cooling; grinding; calcination; and cooling to obtain the luminescent material.

The invention relates to a boron aluminate luminescent material capable of generating green light and a preparation method thereof. The chemical formula of the luminescent material capable of generating green light is M1-x-y-zGdxTbyNzAl3BO7, wherein M is at least one of Ba, Sr, N is Na, Li or K, and x, y, and z satisfy the relations: 0.001 <= x <= 0.20, 0.005 <= y <= 0.50, 0.02 <= z <= 0.30, 1-x-y-z > 0. The preparation method comprises the steps: weighing raw materials and a flux in proportion; grinding and mixing well, then pre-sintering under a lower temperature; then calcining under a temperature of 900 to 1100 DEG C for 1 to 24 hours; grinding after cooling; and obtaining the boron aluminate luminescent material capable of generating green light of the invention. The method of the invention is simple, has no pollution, and is benefit for industrial production. The obtained luminescent material capable of generating green light has short afterglow, high luminous intensity and excellent luminous performance, and can be widely used for PDP or mercury-free fluorescent lamp.

The invention relates to a boron aluminate luminescent material capable of generating green light and a preparation method thereof. The chemical formula of the luminescent material capable of generating green light is M1-x-y-zGdxTbyNzAl3BO7, wherein M is at least one of Ba, Sr, N is Na, Li or K, and x, y, and z satisfy the relations: 0.001 <= x <= 0.20, 0.005 <= y <= 0.50, 0.02 <= z <= 0.30, 1-x-y-z > 0. The preparation method comprises the steps: weighing raw materials and a flux in proportion; grinding and mixing well, then pre-sintering under a lower temperature; then calcining under a temperature of 900 to 1100 DEG C for 1 to 24 hours; grinding after cooling; and obtaining the boron aluminate luminescent material capable of generating green light of the invention. The method of the invention is simple, has no pollution, and is benefit for industrial production. The obtained luminescent material capable of generating green light has short afterglow, high luminous intensity and excellent luminous performance, and can be widely used for PDP or mercury-free fluorescent lamp.

The invention discloses rare earth borate-based red fluorescent powder. According to the fluorescent powder, CaInBO4 is used as a base body, 0.02-0.08 at.% of Al<3+> is doped to enter In<3+> bit, 0.02-0.08 at.% of Ba<2+> is doped to enter Ca<2+> bit and 0.07-0.10 at.% of Eu<3+> is doped to enter In<3+> bit, so that fluorescent powder (In(1-x-z), Alx, Euz)(Ca(1-y), Bay)BO4 is obtained, wherein x is equal to 0.02-0.04, y is equal to 0.05-0.07, and z is equal to 0.07-0.1. The rare earth borate-based red fluorescent powder provided by the invention has excellent properties of high luminous intensity, warm color, rapid decay, short persistence, good heat stability, easiness in long-term preservation and wide application range.