Synthesis And Luminescent Properties Of New Long Afterglow Materials

Despite the usually unwanted occurrence of strong afterglow, there has a constantly growing market for persistent luminescence material. Material with the long-lasting property can be used in many fields, including illumination, decoration and optical data storage. In this thesis, several new long afterglow materials were reported. Furthermore, the optical characteristics and the mechanism of the occurrence of long afterglow were discussed carefully. This thesis is divided into five chapters.In the first chapter, one briefly introduce about the long afterglow material were given, as well as the current survey, research significance and the results in this thesis.In the second chapter, the afterglow characteristics of Eu3+ activated CaWO4 were discussed. Also, the defect types of CaWO4: Eu were analyzed with thermoluminescence spetra. CaWO4: Eu resembles CaTiO3:Pr in the afterglow performance.In the third chapter, the optical characteristics of the tervalent rare earth ions activated Cd3Al2Ge3O12 and Ca4ZrGe3O12 ,which belong to garnet structure, were discussed. Moreover, the influences of the valence change tendency of rare earth elements for the afterglow performance were summarized.In the fourth chapter, the optical characteristics of CaZrO3 and CaSnO3, which belong to perovskite structure, were discussed. The functions of the lithium ion in CaZrO3:Pr were given.In the fifth chapter, the mechanism of the occurrence of long afterglow were discussed carefully, and a new model was proposed to explain the mechanism of the occurrence of long afterglow.