The Study Of The Long Persistent Phosphor SrAl₂O₄: Eu, Dy

A new type of long persistent phosphor SrAl2O4 Eu, Dy, which can be used to night illumination and decoration, has been synthesized and got rapid development in the middle of 20th century. The aluminates are used as the base and the rare earth materials are used as the luminescence center and trap center. The excitation resource can be visible light and man-made light, so this type of long persistent phosphor has the advantages of no-radiation and no need of electricity. Its luminescence character has surpassed the traditional phosphor Zn:S. So SrAl2O4 Eu, Dy can be regarded as high efficiency solid display material. In this dissertation, SrAl2O4: Eu, Dy is prepared by high temperature solid-state reaction, which contained the steps of stoichiometry, grind and high temperature agglomeration. By the study of the whole decay curves of 10 hours, the influence of each step is summarized , and the best stoichiometry and preparation techniques are acquired. The crystal structure of SrAl2O4 Eu2+, Dy3+ is monoclinic system, which is a high efficiency luminescence crystal structure. The emission spectrum and the excitation spectrum of SrAl2O4 Eu2+, Dy3+ powder are measured. And the luminescence mechanism of long persistent phosphor is also discussed.Through this dissertation, the best preparation methods for large-scale industrial production can be provided.