The Surface Coordination And Application Of SAO-ED

SrAl₂O₄:Eu²⁺, Dy³⁺ (SAO-ED) is the most widely used long afterglow phosphor because ofits excellent afterglow properties, and it is also a new type of energy source material andenergy-saving material. But there are two disadvantages of it, poor water resistance and poororganics miscibility. This paper reports a new way called "surface coordination" to improvethe water resistance and organics miscibility of SAO-ED. The organics were introduced tothe surface of SAO-ED by the reaction between organic ligands and surface unsaturated metalions, and the introduction of organic ligands improved the water resistance and organicsmiscibility of SAO-ED.Different kinds of ligands, such as Schiff base ligands(Salen, Salpn, Salophen), carboxylicacid ligands(citric acid, tartaric acid), heterocyclic ligands(8-hydroxyquinoline) and thecopolymer of styrene and maleic acid were used to coordinate with SAO-ED, and the surfacecoordinated SAO-ED was characterized by FT-IR spectra. The water resistance was measuredby testing the increase of electroconductivity of the water as a result of the hydrolysis ofSAO-ED, and the organics miscibility was measured by testing the depositing time ofcoordinated SAO-ED in organic solvents. SAO-ED coordinated with copolymer gave betterresults both in water resistance and organics miscibility than the others, and the damage toSAO-ED could be avoided by controlling the content of maleic acid in the copolymer.The application properties of surface coordinated SAO-ED were also investigated.Luminescent painting and printing were prepared with surface coordinated SAO-ED anduncoordinated SAO-ED, respectively, and their stability, water resistance, boiling resistanceand rubbing fastness were compared with each other, and the results showed that mostapplication properties of surface coordinated SAO-ED with copolymer were obviouslyimproved.