Polymer grafted alkali earth aluminate phosphor through coordination bond

Abstract

The invention provides a kind of polymer grafted long afterglow phosphor which composed of alkali earth aluminate phosphor grafted by polymer through coordination bond and a method for producing the same. The method for producing a polymer grafted phosphor comprise two steps: the alkali earth aluminate activated by rare earth ions is coordinated with difunctional ligand to form a coordinated long afterglow phosphor; The coordinated long afterglow phosphor was dispersed in organic solvent at 40˜130° C., the ligand was initiated by initiator and could copolymerize with other polymerizable monomer to form the polymer grafted long afterglow phosphor. The formed phosphors have good water resistance and luminescent properties. They can be widely used in fields of luminescent coatings, paints and plastics.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic illustration of the process to prepare polymer grafted long afterglow phosphor.

FIG. 2 is a schematic illustration of the decay curves of polymer grafted and ungrfted long afterglow phosphor.

Claims

1. A polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor through coordination bond, characterized in that said phosphor is the product of polymerization of organic monomer on the surface of difunctional ligand coordinated rare earth ions activated alkali earth alumninate, it has the following formula: A (B) n   (1)

2. The polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor in claim 1, wherein the rare earth ions activated alkali earth aluminate include, but not limited to SrAl2O4:Eu2+,Dy3+, Sr4Al14O25:Eu2+,Dy3+, CaAl2O4:Eu2+,Dy3+, CaAl2O4:Eu2+,Dy3+, BaAl2O4:Eu2+,Pr3+ or MgAl2O4:Eu2+,Nd3+.

3. The polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor in claim 1, wherein the polymerizable β-diketones have the experimental formula:

4. The polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor in claim 1, wherein the polymerizable multi-carboxylic acids and anhydrides have the experimental formula:

5. The polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor in claim 1, wherein the polymerizable amines have the experimental formula:

6. The polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor in claim 1, wherein the polymerizable heterocyclic compounds have the experimental formula: R7-D-R6   (6)

7. The polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor in claim 1, wherein the organic monomers used in the co-polymerization or homo-polymerization are selected from the group consisting of methyl methacrylate, ethyl methacrylate, butyl methacrylate, ethylene, ethylene chloride, propene, styrene, acrylonitrile, butadiene, maleic anhydride, or combination comprising 1˜3 of the foregoings.

8. The method to preparing the polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor in claim 1, comprising the steps of: forming a coordinated rare earth ions activated alkali earth aluminate long afterglow phosphor by the reaction between the rare earth ions activated alkali earth aluminate MxAlyOz:Eu2+,E and the organic difunctional ligands in solvents; and 5 parts of the above coordinated aluminate phosphor is dispersed in solvents at room temperature, then the temperature is increased to 40˜130° C. and the initiator was added to the reaction vessel, afterward, 0.1˜500 parts of polymerizable monomer was dropped into the reaction vessel, and kept the reaction at 40˜130° C. then the polymer grafted rare earth ions activated alkali earth aluminate long afterglow phosphor is formed.

9. The method of the claim 8, in which the solvents used in the polymerization step are selected from the group consisting of chloroform, ethanol, hexane, the mixture of hexane and ethyl acetate and N,N-dimethyl formamide.

10. The method of the claim 8, in which the solvents used in the coordination step are selected from the group consisting of C1-C6 aliphatic alcohols, chloroform, ethylene dichloride, methylene dichloride, tetrahydrofuran, acetone and acetonitrile.