US 9,011,721 B2 · Halo-silicate luminescent materials and preparation methods thereof

Abstract

Halo-silicate luminescent materials and preparation methods thereof are provided. The said luminescent materials are represented by the following general formula: (Ba1-yAy)2-xSiO4:Eux, Dz@ Mn, wherein A is selected from one or two of Sr, Ca, Mg or Zn, D is selected from one of F or Cl, M is selected from at least one of Ag, Au, Pt, Pd or Cu metal nano-particles; @ is coating; (Ba1-yAy)2-xSiO4:Eux, Dz, is shell; 0.001<x≦0.15, 0≦y≦0.5, 0≦z≦0.5, 0<n≦1×10−2. The said luminescent materials have excellent chemical stability and high luminous intensity. Furthermore, the luminescent materials have controlled spherical shape which is beneficial to the coating screen process and the improved displaying effect. The said preparation methods have simple technique, no pollution, manageable process conditions and low equipment requirement, and are beneficial to industry production.

Claims13

Dependent claims

Silicate luminescent materials represented by the general formula of (Ba1-yAy)2-xSiO4:Eux, Dz@ Mn, wherein A is one or two of Sr, Ca, Mg and Zn, D is any one of F and Cl, M is at least one metal nano-particles of Ag, Au, Pt, Pd and Cu;

@ is coating, M nano-particles is a core;
(Ba1-yAy)2-xSiO4:Eux, Dz fluorescent powders are shell;
x is in the range of 0.001<x≦0.15, y is in the range of 0≦y≦0.5, z is in the range of 0≦z≦0.5, n is molar ratio of M nano-particles to Si in fluorescent powders, n is in the range of 0<n≦1×10−2.

A preparation method of silicate luminescent materials, comprising:

step S1:
adding surface treating agent into M nano-particles colloid, then successively adding ethanol, water, ammonia water and tetra ethoxy silane, obtaining solution containing nano-sphere of M nano-particles coated in SiO2;
wherein, M is at least one nano-particles of Ag, Au, Pt, Pd and Cu;
step S2:
regulating pH value of solution containing nano-sphere of M nano-particles coated in SiO2 obtained from step S1 to 5, then adding nitrate solutions of Ba, A and Eu separately, and adding aqueous nitrate solutions of BaD2 or AD2 according to the stoichiometric ratio of corresponding elements in (Ba1-yAy)2-xSiO4:Eux, Dz, next, adding precipitator, after stirring and reacting for 1 to 8 h, placing precipitates into oven for drying to obtain precursor;
wherein, A is one or two of Sr, Ca, Mg and Zn, D is any one of F and Cl;
x is in the range of 0.001<x≦0.15, y is in the range of 0≦y≦0.5, z is in the range of 0≦z≦0.5, n is molar ratio of M nano-particles to Si in fluorescent powders, n is in the range of 0<n≦1×10−2;
step S3:
cooling and grinding the precursor obtained from step S2 after heat treatment and reducing treatment, obtaining said silicate luminescent materials represented by the general formula of (Ba1-yAy)2-xSiO4:Eux, Dz@ Mn;
wherein, @ is coating, M nano-particles is a core;
(Ba1-yAy)2-xSiO4:Eux, Dz fluorescent powders are shell.

8 more elements

Dependencies are inferred from the claim text.

Halo-silicate luminescent materials and preparation methods thereof

Life of this patent

Halo-silicate luminescent materials and preparation methods thereof

Life of this patent

Abstract

Claims13