超长余辉发光材料的制备与性质研究
关键词：超长余辉 铝酸锶 燃烧法 高温固相法 制备
Abstract At first,in this paper, the preparation of strontium aluminate long afterglow luminescent materials was developed via the combustion method.In the process,we study the best solution of rare earth metal ions Strontium aluminate long-lasting phosphors via high temperature solid state method and the combustion method,to reduce the production cost.The research shows that Eu doping concentration is 0.02 mol, Dy/Eu to 1, so we can get the best good solution in the aspect of afterglow performance. Secondly,the SrAl2O4:Eu,Dy phosphors from the combustion method were obtained by calcining the precursor in the electric muffle furnace under a weak reducing atmosphere of carbon maintained at 1350 °C for 3 h.Finally, I compared the sample of high temperature solid state method and that of combustion method.The fluorescent powder of the best afterglow performance just need 600 degrees Celsius calcined for 10 minutes via the combustion method,and the powder grain size is small, the phase is high pure.While he fluorescent powder of the best afterglow performance need 1350 degrees Celsius calcined for 3 hours via the high temperature solid state method,and the powder grain size is big, need to pass the ball grinding and screening.As a result,the combustion method can overcome the disadvantage -crushing grinding grain in the high temperature solid state method.And ,it do not need complicated external heating equipment,quick reaction ,energy conservation.The combustion method is a promising method of preparation of luminescent materials.
Keywords: ultra-long afterglow、Strontium aluminate、combustion method、the high temperature solid state method synthesis
目 录
1 综述 1
1.1 长余辉发光材料概述 1
1.2 长余辉发光材料的基本组成 1
1.3 长余辉发光材料的种类和特性 2
1.4 长余辉发光机理及余辉特性 4
1.4.1 空穴转移模型 4
1.4.2 位型坐标模型 6
1.4.3 电子陷阱模型 7
1.5 激活剂在长余辉发光材料的作用 8
1.6 碱土金属铝酸盐长余辉发光材料的制备 8
1.6.1 高温固相反应法 8
1.6.2 燃烧法 9
1.6.3 溶胶－凝胶法 10
1.6.4 共沉淀法 10
1.7 发光材料的应用 11
1.8 研究思路 12
2 实验部分 13
2.1 实验药品 13
2.2 主要仪器 13
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