2O4:Eu2+,Dy3+belong to the new system of light-emitting oxide phosphor. It has...">
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Modification Of Long Afterglow Luminescent Materials SrAl2O4:Eu2+,Dy3+ Phosphor Research

Posted on:2010-11-23Degree:MasterType:Thesis
Country:ChinaCandidate:Y YangFull Text:PDF
GTID:2251330425462431Subject:Chemical processes
Abstract/Summary:PDF Full Text Request
Long afterglow luminescent material is a "green" light material, one of SrAl2O4:Eu2+,Dy3+belong to the new system of light-emitting oxide phosphor. It has a high luminousefficiency, long-time and non-radioactive light-emitting characteristics, and a wide range ofapplications. However, the oxide phosphor in the wet system of luminous environment proneto hydrolysis, resulting in failure light-emitting, and poor organic miscibility, it can berestricted by the scope of the application. This paper reports a way called ligand-coated toimprove the water resistance and organics miscibility of phosphor. The organics wereintroduced to the surface of phosphor by the reaction between organic ligands and surfaceunsaturated metal ions, and the introduction of organic ligand improved the water resistanceand organic miscibility of phosphor.This paper selects maleic anhydride and acetyl acetone as a ligand and carry onligand-coated to SrAl2O4:Eu2+,Dy3+phosphor, obtain ligand-coated phosphor. Products aredetermined by infrared spectroscopy, proved that there is coordination bond between the two.Test the light-emitting properties, water resistance properties and organic compatibility ofligand-coated phosphor, the results show that water resistance properties and organiccompatibility of two ligand coordination coated phosphor have been improved. However,there is a certain damage to afterglow properties of light-emitting phosphor, and waterresistance properties is not very satisfactory.Based on cationic Gemini surfactants with good amphiphilic and dispersion, and partialpositively charged nature of its positive ion, investigate new features of the above-mentionedcoating process with Gemini surfactants effect. Use ethylenediamine and epichlorohydrin asraw materials, compose quaternary ammonium Gemini surfactants, add compound cationicGemini surfactants in maleic anhydride ligand-coated phosphor, combine water-resistantperformance research results, Optimized coated conditions have been obtained throughorthogonal experiment: use chloroform as solvent; the reaction temperature is40℃; thereaction time is6h; the amount of maleic anhydride is1.2g; the amount of Gemini surfactantsis0.2g. And conduct characterization of the light-emitting properties and organic compatibility on it. The results show that: use Gemini surfactants as auxiliaries of maleicanhydride coated phosphor, which can reduce the amount of maleic anhydride of coatedprocess; improve the coated efficiency of maleic anhydride at the surface of phosphor, thusimprove the water resistance properties and organic compatibility of inorganic phosphorbetter; and which hardly have negative impact on the brightness and afterglow degrees ofphosphor.
Keywords/Search Tags:SrAl2O4:Eu2+, Dy3+ phosphor, Gemini surfactants, Ligand-coated, waterresistance
PDF Full Text Request
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