Research of the New Materials of Long-lasting Phosphors and Upconversion Luminescence

　　Research of the New Materials of Long-lasting Phosphors and Upconversion Luminescence
　　Long-lasting phosphorescence and upconversion luminescence are two important area in luminescence material, which can be used in many fields, including illumination, decoration and optical deta storage. In this thesis, several long afterglow and upconversion luminescence materials in oxysulfide were reported. Furthermore, the optical characteristics and the mechanism of the occurrence of these materials were discussed carefully. This thesis is divided into seven Block Neodymium magnets chapters.In the first chapter, one briefly introduce of the development about the persistent afterglow luminescence and upconversion luminescence, as well as the current survey, research significants and the results in this thesis.In the second chapter, the afterglow luminescence of Gd2O2S: Ti was reported, and the mechanism of the hole and electron was synthesized.In the third chapter, we discussed the long-lasting luminescence of Gd2O2S: Er, Ti, and give the mechanism of energy transfer from Ti to Er. In the fourth chapter, some rare earth ions like La, Gd, Lu were doped into the Y2O2S host, and the afterglow luminescence was checked; meanwhile the mechanism was discussed.In the fifth chapter, we introduce the the upconversion luminescence in Y2O2S host according the their optical spectra, while the Er, Yb, Tm, Ho, Sm were doped.In the sixth chapter, the up-conversion luminescence materials yttrium http://www.999magnet.com oxysulfide doped by yb3+/Er3+ were systhesized by oprecipitation with their subsequent thermal decomposition in presence of sulphur, the luminescence properties and morphology from these products systhesized were contraled by different synthsis temperature and time.In the seventh chapter, the self-active luminescence of YOR(R=F,Cl,Br) were reported; also the defect type were analyzed with thermoluminescence spectra.