Rare earth red fluorescent powder for light emitting diode and preparation method thereof

The invention provides rare earth red phosphor powder used for LEDs and a preparation method thereof, and relates to phosphor powder. The chemical formula of the rare earth red phosphor powder is AxMoO4:yEu<3+>, (1-x-y)B<3+>. In the method used for preparing the rare earth red phosphor powder, oxides, carbonates or nitrates of Ca, Sr, Ba, Mg, Mo, La, Gd, Sm, Y, Cr, Na, K and Li are used as raw materials and are weighed according to the components of the structural formula and stoichiometric ratio; the raw materials are ground and beaten uniformly, and are preheated in air before the raw materials are reground uniformly and are sintered for 1 to 16 hours at 500 to 1200 DEG C; after the raw materials are cooled and ground, the powder is poured into dilute acid solution at room temperature; after ultrasonic agitation, the solution is placed still and filtered, is washed with de-ionized water, and is dried in an oven into powder, thus producing the red phosphor material. The chemical property ...

Method for preparing ferric oxide composite pigment doped with rare earth and silicon oxide

The invention discloses a method for preparing ferric oxide composite pigment doped with rare earth and silicon oxide, and relates to a method for preparing the composite pigment. The method comprises the steps of: adding the right amount of water and dispersing agent into Fe2O3 processed by ball-milling for ultrasonic oscillation; putting the mixture into constant temperature water bath and violently stirring, and adding Na2SiO3 water solution and Re2O3 acid solution to react for a period of time at a certain temperature; after the reaction, ageing for a period of time, filtering and drying a filter cake; and finally, baking the dried filter cake for a period of time at a certain temperature, cooling and taking out for grinding, and obtaining the product. The composite pigment prepared by the method has the brightness value L<*> reaching 33-38, the red degree value a<*> reaching 28-33, the acid resistance improved by more than 94%, the temperature endurance improved by more than 100%and ...

Water-soluble PnO2-PODIPY/PnO2-azaPODIPY fluorescent dye and preparation method thereof

The invention relates to a dye and a preparation method thereof. The fluorescent dye is a series of novel dye which takes PnO2-PODIPY/PnO2-azaPODIPY developed from dipyrrin/aza-dipyrromethene complexing PnO2 (Pn-P, As, Sb, Bi) as a parent nucleus, and the general formula of the fluorescent dye is as shown in I/II. The fluorescent dye disclosed by the invention has the advantages of spectral property and the like of the classic traditional dye BODIPY/azaBODIPY. Although a central atom Pn is a sexadentate, the fluorescent dye is stable without being decomposed in air and a water solution. The compound has the outstanding characteristics of excellent water solubility and certain cell membrane permeability and can be used for biological dyeing. The novel dye disclosed by the invention has a novel spectral characteristic and can be applied to the aspect of fluorescence imaging.

Rare earth red fluorescent powder for light emitting diode and preparation method thereof

The invention provides rare earth red phosphor powder used for LEDs and a preparation method thereof, and relates to phosphor powder. The chemical formula of the rare earth red phosphor powder is AxMoO4:yEu<3+>, (1-x-y)B<3+>. In the method used for preparing the rare earth red phosphor powder, oxides, carbonates or nitrates of Ca, Sr, Ba, Mg, Mo, La, Gd, Sm, Y, Cr, Na, K and Li are used as raw materials and are weighed according to the components of the structural formula and stoichiometric ratio; the raw materials are ground and beaten uniformly, and are preheated in air before the raw materials are reground uniformly and are sintered for 1 to 16 hours at 500 to 1200 DEG C; after the raw materials are cooled and ground, the powder is poured into dilute acid solution at room temperature; after ultrasonic agitation, the solution is placed still and filtered, is washed with de-ionized water, and is dried in an oven into powder, thus producing the red phosphor material. The chemical property ...

Method for preparing calcium magnesium chloro-silicate for green emitting phosphor

This invention discloses a method for preparing fluorescent powder calcium magnesium chlorosilicate. The method comprises: (1) weighing oxides or salts of the elements shown in Ca8Mg (SiO4)4Cl2: Re, Ln according to the mol. ratio, grinding and mixing uniformly; (2) sintering at 1000 deg.C in a reductive atmosphere for 3 h; (3) cooling the sintered body, and pulerizing. The obtained fluorescent powder has strong color rendering property, and adjustable fluorescent color and color temperature.

Rare-earth red fluorescent material and method for preparing same

The present invention discloses a rare earth red fluorescence material and a preparation method thereof and relates to a fluorescence powder. The chemical measurement formulas of the fluorescence powder are Ax(MoO4)y(WO4)1-y:zEu<3+>, zB<3+> and AxMO4:yEu<3+>, zB<3+>. In the preparation method, Ca, Sr, Ba, Mg, Zn, Mo, W, Cr, V, La, Gd, Sm, Y, Na, K, oxide of Li, carbonate or nitrate are used as raw materials and are weighted according to the composition proportion; the raw materials are grinded, stirred uniformly, preheated, grinded uniformly again and sintered at 700-1400 DEG C; at the room temperature, the powder is poured in dilute acid, stirred through supersonic wave, put statically for filtering, washed with deionized water, and then put in an oven to be dried. Thus, the red fluorescence material is obtained. The fluorescence powder of the invention is provided with stable chemical performance. The preparation method of the fluorescence powder is simple, operated easily and environmental ...

Preparation method of catalyst suitable for synthesizing C8 and C12 through oligomerization of 1-butene

A preparation method of catalyst suitable for synthesizing C8 and C12 through oligomerization of 1-butene relates to a catalyst preparing method. In the method, equivalent-volume impregnation is employed. Fe(NO3)3 is firstly dissolved and then is impregnated onto [gamma]-Al2O3. A drying process and a calcination process are carried out. (NH4)2SO4 is firstly dissolved and then is impregnated onto Fe(NO3)3/[gamma]-Al2O3. The SO4<2->/[gamma]-Al2O3-Fe2O3 catalyst having high activity and high target product selectivity is obtained through the drying process and the calcination process. The catalyst, when being used in oligomerization of 1-butene, is high in high activity and high in target product selectivity so that the catalyst can be used for synthesizing C8 and C12 through oligomerization of the 1-butene. The raw materials of the catalyst are easy to obtain. The catalyst is simple in preparation method, is mild in reaction condition, is low in medicine and device costs and is high in reaction ...

Rare-earth red fluorescent material and method for preparing same

The invention discloses a rare earth red fluorescence material and a preparation method thereof and relates to a fluorescence powder. The chemical measurement formulas of the fluorescence powder are Ax(MoO4)y(WO4)<1-y>:zEu<3+>, zB<3+> and AxMO4:yEu<3+>, zB<3+>. In the preparation method, Ca, Sr, Ba, Mg, Zn, Mo, W, Cr, V, La, Gd, Sm, Y, Na, K, oxide of Li, carbonate or nitrate are used as raw materials and are weighted according to the composition proportion; the raw materials are grinded, stirred uniformly, preheated, grinded uniformly again and sintered at 700-1400 DEG C; at the room temperature, the powder is poured in dilute acid, stirred through supersonic wave, put statically for filtering, washed with deionized water, and then put in an oven to be dried. Thus, the red fluorescence material is obtained. The fluorescence powder of the invention is provided with stable chemical performance. The preparation method of the fluorescence powder is simple, operated easily and environmental ...

Green photoluminescent phosphor and preparing method thereof

Rare-earth element modified catalyst for low-temperature synthesizing methanol

The invention relates to a rare earth element-modified catalyst for synthesizing methanol at low temperature. The catalyst contains noble metal 1% and rare earth element 10%, wherein the mole ratio of Cu/Zn is 1:1; the noble metal includes Pd, Pt and Ru, and the rare earth element includes La and Y. The catalyst is prepared by a coprecipitation method. With the method, catalysts of Cu-Pd/ZnO/La2O3, Cu-Pt/ZnO/La2O3, Cu-Ru/ZnO/La2O3, Cu-Pd/ZnO/Y2O3, Cu-Pt/ZnO/Y2O3 and Cu-Ru/ZnO/Y2O3 can be respectively obtained. Since the method introdues noble metal such as Pd, Pt and Ru into the catalyst, catalyst activity in an intermediate formate hydrogenation step during a low-temperature synthesis process of methanol is improved so as to further improve the CO conversion.

Sodium titanate nanowire supported copper catalyst as well as preparation method and application thereof

The invention discloses a sodium titanate nanowire supported copper catalyst, which is characterized in that a sodium titanate nanowire is used as a carrier, copper nanoparticles are supported on the sodium titanate nanowire, and the size of the copper nanoparticles is 4-10 nm; the sodium titanate nanowire is of a linear layered structure, and the average diameter of the sodium titanate nanowire is 70nm; the loading capacity of the copper nanoparticles is 4%-20%. The invention also provides a preparation method of the sodium titanate supported copper catalyst and a method for preparing calcium lactate and hydrogen by using the sodium titanate supported copper catalyst. The sodium titanate nanowire supported copper catalyst is prepared by adopting a wet chemical reduction method, and the sodium titanate nanowire and nano-copper particles of the catalyst are small in size and good in dispersity and stability. When the catalyst is used for catalyzing glycerol dehydrogenation to prepare calcium ...

Method for preparing ferric oxide composite pigment doped with rare earth and silicon oxide

The invention discloses a method for preparing ferric oxide composite pigment doped with rare earth and silicon oxide, and relates to a method for preparing the composite pigment. The method comprisesthe steps of: adding the right amount of water and dispersing agent into Fe2O3 processed by ball-milling for ultrasonic oscillation; putting the mixture into constant temperature water bath and violently stirring, and adding Na2SiO3 water solution and Re2O3 acid solution to react for a period of time at a certain temperature; after the reaction, ageing for a period of time, filtering and drying afilter cake; and finally, baking the dried filter cake for a period of time at a certain temperature, cooling and taking out for grinding, and obtaining the product. The composite pigment prepared bythe method has the brightness value L<*> reaching 33-38, the red degree value a<*> reaching 28-33, the acid resistance improved by more than 94%, the temperature endurance improved by more than 100%and the ...

Method for catalytically synthesizing calcium lactate and hydrogen by using Cu/apatite nano-catalyst

The invention discloses a method for catalytically synthesizing calcium lactate and hydrogen by using a Cu/apatite nano catalyst, which comprises the following steps: adding a glycerol aqueous solution, calcium hydroxide and a Cu/apatite nano catalyst into a reaction kettle, with the concentration of the glycerol aqueous solution being 0.5-2 mol/L; the molar ratio of the calcium hydroxide to the glycerol is (0.4-0.8): 1; the mass ratio of glycerol to the catalyst is 20: 1; and introducing nitrogen for purging, heating to 210-230 DEG C, carrying out constant-temperature stirring reaction for 0.5-4 hours to obtain calcium lactate reaction liquid and hydrogen, and concentrating and crystallizing the calcium lactate reaction liquid to obtain a calcium lactate product. According to the method, the Cu/apatite nano-catalyst is used for catalyzing glycerol to synthesize calcium lactate and hydrogen, and under the optimal condition, the conversion rate of glycerol is 100%, the selectivity of calcium ...