Study On Preparation And Properties Of Low-dimensional Y₂O₂S:Eu³⁺, Mg²⁺, Ti⁴⁺ Red Long Persistent Phosphors

Recently, the long-lasting nanocrystals have attracted great attention because their high integration has been widely used in photoelectric information, automobile instrument, biochemical and medical devices and so on. The long-lasting nanorods and nanotubes have been successfully synthesized. But the reports of the long-lasting nanotube arrays successfully synthesized have a little at present. This is also a difficulty and a focus of research at this stage. So the synthetic methods of the one-dimension long-lasting Y2O2S:Eu3+, Mg2+, Ti4+nanotube arrays are researched in this paper. At the same time, the luminescent properties have been studied systematically.The afterglow phosphors Y2O2S:Eu3+, Mg2+, Ti4+nanotube arrays have been synthesized by sol-gel template method using acetyl acetone as complexing agent. The influence of sulfuretted temperature on luminescent property of Y2O2S:Eu3+, Mg2+, Ti4+nanotube arrays has been studied. The afterglow phosphors Y2O2S:Eu3+,Mg2+,Ti4+nanocrystals have been synthesized by sol-gel method using EDTA (Ethylene Diamine Tetraacetic Acid) as complexing agent. The influence of sulfuretted temperature and concentrations of Eu3+on the luminescent properties of the samples has been studied systematically. The Y2O2S:Eu3+,Mg2+,Ti4+nanotube arrays have been synthesized by sol-gel template method using EDTA as complexing agent. The luminescent properties of the samples have been studied systematically. The luminescent properties of Y2O2S:Eu3+, Mg2+, Ti4+nanotube arrays synthesized by different methods have been compared. The results follow:(1) The results reveal that the Y2O2S:Eu3+, Mg2+, Ti4+nanotube arrays synthesized by sol-gel template method using acetyl acetone as complexing agent are highly ordered. The nanotubes have uniform diameter. When the sulfuretted temperature rises to850℃, the sample has the optimal initial intensity and afterglow time, which are1936mcd/m2and170s (>mcd/m2), respectively. The strongest red-emission lies at626nm under the320nm UV irradiation.(2) Compared with Y2O2S:Eu3+, Mg2+, Ti4+powders synthesized by sol-gel method using acetyl acetone as complexing agent, the synthesis conditions and the afterglow properties of samples synthesized by sol-gel method using EDTA as complexing agent have been greatly improved. The diameter of the nanocrystal is increased gradually with the increase of sulfuretted temperature. The main excited peaks of samples show red-shift with the increase of sulfuretted temperature, but the positions and shapes of emission peaks of samples do not change. The main emission peak at626nm is according to Do to F2transition of Eu3+. The optimal afterglow time of the sample is95min when the sulfuretted temperature is1100℃.(3) Compared with Y2O2S:Eu3+, Mg2+, Ti4+nanotube arrays synthesized with sol-gel template method using acetyl acetone as complexing agent, the samples synthesized with sol-gel method using EDTA as complexing agent have a better phase under the same sulfuretted temperature. The afterglow time of the latter is17min and14min longer than the former. When the sulfuretted temperature rises to800℃, the latter shows the optimal afterglow properties. The former shows the optimal afterglow properties at850℃. So the optimal sulfuretted temperature is reduced by50℃.