马来酸酐表面包覆SrAl_2O_4:Eu^(2+),Dy^(3+)发光粉及其耐水性能

MALEIC ANHYDRIDE SURFACE MODIFICATION OF SrAl_2O_4:Eu^(2+),Dy^(3+) AND ITS WATER-RESISTANCE

以马来酸酐为原料,采用界面配位化学法制备出表面包覆有马来酸酐的SrAl2O4:Eu2+,Dy3+发光复合粉体。运用酸度计测量复合粉体在水中的pH值。通过配位多面体生长基元理论确定包覆的关键因素是溶剂、反应温度、溶液pH及反应时间,探讨了这些参数对包覆后发光粉耐水性能的影响。结果表明:优化的包覆条件为:以氯仿为溶剂,反应温度为(35±5)℃,溶液pH=8.5,反应时间为6h。在此条件下,在SrAl2O4:Eu2+,Dy3+表面易于形成均匀致密连续的马来酸酐膜层,而且,复合粉体的耐水性能最优。

A composite photoluminous phosphor SrAl2O4：Eu^2＋, Dy^3＋ encapsulated with maleic anhydride film was prepared by the interface coordination chemistry method and using maleic anhydride as a raw material. The pH value of the water solution when composite photoluminous phosphor dipped in water was measured by the pH meter. The key factors of encapsulation： solvent, reactive temperature, pH value of the solution and reactive time, were determined by the growth unit theory of coordination polyhedrons. The effect of these parameters on the water resistance of the encapsulated composite phosphors was investigated. Results show that the optimum encapsulation conditions are chloroform as solvent, a reactive temperature of （35±5） ℃, pH value of 8.5 and a reaction time of 6 h, in which the homogenous and compact maleic anhydride coating of SrAl2O4：Eu^2＋,Dy^3＋ phosphor is formed. Thereby, the water resistance of the composite phosphor is improved.