Abstract: Double core-shell fluorescent materials and preparation methods thereof are provided. The double core-shell fluorescent materials include inner core, inner shell coating the inner core and outer shell coating the said inner shell. The inner core is metal particle and the chemical constitution of the inner shell is silicon dioxide. The outer shell is fluorescent powder represented by the following chemical formula: (R1-x, Eux)2O3, wherein R is Y, Gd or combination thereof, 0.02?x?0.1. The double core-shell fluorescent materials with uniform and stable luminous effect not only increase luminous intensity, but also decrease usage amount of fluorescent powder by using metal particle as inner core.

Abstract: A preparation method of zinc manganese silicate is provided. The method includes the following steps: step 1, preparing silicon dioxide sol with distilled water, anhydrous ethanol and tetraethyl orthosilicate; step 2, preparing a mixture solution of a zinc salt and a manganese salt; step 3, adjusting the silicon dioxide sol to be neutral or acidic; step 4, adding the mixture solution of the zinc salt and the manganese salt into the silicon dioxide sol to form a gelatin; step 5, drying the gelatin, keeping the temperature, grinding, reducing with keeping the temperature in a reductive atmosphere to obtain zinc manganese silicate. The preparation method has simple technique and low equipment requirement. The particles of the zinc manganese silicate phosphor prepared by the method have a regular size, uniform shape and good luminescent performance.

Abstract: A method for producing core-shell magnetic alloy nanoparticle, comprising: step 1, dissolving nickel compound to produce solution; step 2, adding surfactant into the solution; step 3, dissolving the first reducing agent to produce the first reducing solution; step 4, adding the first reducing solution into the solution obtained from step 2, obtaining nickel nano-collosol by stirring and aging; step 5, adding metallic compound into the nickel nano-collosol; step 6, dissolving the second reducing agent to produce the second reducing solution; step 7, adding the second reducing solution into the mixed solution obtained from step 5; step 8, allow the product to stand, then discarding the supernatant, redispersing in water or absolute ethyl alcohol to obtain the core-shell magnetic alloy nanoparticle using nickel as the core.

Abstract: A preparation method of zinc manganese silicate is provided. The method includes the following steps: step 1, preparing silicon dioxide sol with distilled water, anhydrous ethanol and tetraethyl orthosilicate; step 2, preparing a mixture solution of a zinc salt and a manganese salt; step 3, adjusting the silicon dioxide sol to be neutral or acidic; step 4, adding the mixture solution of the zinc salt and the manganese salt into the silicon dioxide sol to form a gelatin; step 5, drying the gelatin, keeping the temperature, grinding, reducing with keeping the temperature in a reductive atmosphere to obtain zinc manganese silicate. The preparation method has simple technique and low equipment requirement. The particles of the zinc manganese silicate phosphor prepared by the method have a regular size, uniform shape and good luminescent performance.

Abstract: Double core-shell fluorescent materials and preparation methods thereof are provided. The double core-shell fluorescent materials include inner core, inner shell coating the inner core and outer shell coating the said inner shell. The inner core is metal particle and the chemical constitution of the inner shell is silicon dioxide. The outer shell is fluorescent powder represented by the following chemical formula: (R1-x, Eux)2O3, wherein R is Y, Gd or combination thereof, 0.02?x?0.1. The double core-shell fluorescent materials with uniform and stable luminous effect not only increase luminous intensity, but also decrease usage amount of fluorescent powder by using metal particle as inner core.