马来酸酐包覆SrAl2O4：Eu^2＋,Dy^3＋发光粉及光致发光性能

SrAl_2O_4:Eu^(2+), Dy^(3+) PHOSPHOR POWDER COATED WITH MALEIC ANHYDRIDE AND ITS PHOTOLUMINESCENCE PROPERTIES

用X射线光电子能谱研究马来酸酐(maleic anhydride,MA)包覆SrAl2O4:Eu2+,Dy3+(SAO:ED)发光粉各元素的电子结合能,提出了界面配位键合的包覆机制。探讨了包覆参数溶剂种类、反应温度、溶液pH值及反应时间对包覆后MA/SAO:ED复合发光粉光致发光性能的影响。结果表明:以氯仿为溶剂,反应温度为30℃,溶液pH=9.0,反应时间为6h时,制备的MA/SAO:ED复合发光粉的光致发光性能最优,在363nm得到最大激发,在512nm得到最大发射,发光强度最大。除了初始亮度略有降低以外,MA包覆层并不影响MA/SAO:ED发光粉的余辉特性。

The electronic binding energies of various elements in SrAl2O4：Eu2＋, Dy3＋ （SAO：ED） phosphor powder coated with maleic anhydride （MA） were studied and the coating mechanism of the interfacial coordinating bond was proposed. Effects of key factors for the coating, which are solvent, coating temperature and coating time as well as solution pH value, on the photoluminescence properties of the MA/SAO：ED composite phosphor powder, were investigated. The optimum coating conditions were determined, as follows：chloroform was chosen as the solvent;the coating temperature was set at 30 ℃;the optimal pH value of the solution was 9.0, and the best coating time was 6 h. In these conditions, the MA/SAO：ED composite phosphor powder has one emission peak centered at 512 nm under the excitation wavelength of 363 nm, and the luminous intensity is stronger than that in other conditions. The MA coating layer has little effect on the long afterglow of the MA/SAO：ED composite phosphor powder, except for a decrease of the original brightness.