【作者】 柴颂刚；

【导师】 张力；

【作者基本信息】 华南师范大学 ， 高分子化学与物理， 2007， 硕士

【摘要】 本文系统地总结了稀土离子激活碱土铝酸盐长余辉发光材料的研究现状，对铝酸锶长余辉发光材料的超细粉体合成、表面包覆改性及其在水性涂料中的应用等多个方面进行了研究。应用燃烧法在较低的温度下成功合成了SrAl₂O₄：Eu²⁺，Dy³⁺长余辉发光材料，TEM观察表明晶体为长100nm以上，直径小于30nm的针形结构。进一步研究了炉温、硼酸和稀土加入量等对发光材料性能的影响，应用X射线粉末衍射对不同条件下生成的发光材料的组成和晶体结构进行了表征，用F-2500荧光分光光度计研究了发光材料的激发光谱、发射光谱及余辉性能等特性，结果表明，硼酸和Dy³⁺的加入可以提高发光材料的发光强度和余辉时间。采用无机包覆改性和有机包覆改性，对SrAl₂O₄：Eu²⁺，Dy³⁺发光粉表面进行包覆改性。TEM和IR测试结果表明，发光粉表面包覆一层致密的SiO₂膜；耐水性和发光性能的测试结果表明，包覆后的发光粉有优良的耐水性，同时保存较好的长余辉发光性能；水性环境的储存稳定性测试结果表明，经过有机包覆改性的发光粉，更适合在水性环境中使用和储存。本文以改性后的发光粉为颜料，丙烯酸酯树脂为成膜物质，配制成水性发光涂料，并对水性发光涂料的性能进行了研究。结果表明，发光粉用量、发光粉混合方式、发光粉及其表面改性状况等因素分别对涂膜机械性能、涂膜长余辉发光性能、涂料储存稳定性、涂膜耐水性能等产生重要的影响。以丙烯酸酯乳液为成膜物，添加适量的发光粉及适当的助剂研制出一种超长余辉发光涂料。确定出了该涂料的最佳配方，测定了涂料的各种性能，并对影响涂料性能的主要因素进行了探讨。更多还原

【Abstract】 Research status for the persistent phosphors of rare earth ions doped alkali earthaluminates was systemically summarized in this paper. The synthesis of ultra-finephosphors, surface encapsulation of phosphor and its application in water-bornecoatings were studied and investigated, respectively.A new type of long lasting phosphors with a general formula SrAl₂O₄:Eu²⁺, Dy³⁺was prepared by combustion method at lower temperature. TEM images indicated thatthe phosphors was needle-like with a length of more than 100nm and a diameterbelow 30nm. Influence of furnace temperature, concentration of H₃BO₃ and urea, etc.on the properties of the sample were studied. The structure of the samples wasinvestigated by XRD. The excitation and emission spectra, afterglow characteristicsof the material were measured by F-2500 fluorescence spectrophotometer. The resultsindicated that doping of H₃BO₃ and Dy³⁺ could improve powders’ luminescence andprolong afterglow life of this long after glow phosphor material.Technologies of inorganic encapsulation and organic encapsulation were used forthe surface modification of SrAl 2O 4:Eu²⁺, Dy³⁺ phosphors in this paper. Through theanalysis of TEM and IR images, it is proved that a dense film of SiO₂ on phosphor isproduced. The water-resistance and persistent luminescent properties indicated thatthe encapsulated phosphors had better water-resistance performance and maintainedgood persistent photoluminescence properties. The results of stock stability indicatedthat phosphor with organic encapsulation is better than phosphor with inorganicencapsulation in a hydrous environment.The water-bone coatings were manufactured by using the encapsulatedphosphors as pigments and the acrylic latex as the binder, and the performances of thecoatings were studied in this paper. The results showed that phosphors ratio, differentblending way of phosphors, its surface modification status played important roles onmechanic performances of coating film, persistent luminescence of coating film, stockstability of coatings, water resistance of coating film respectively. The superlong afterglow luminescent coating was prepared by adding properSrAl₂O₄:Eu²⁺, Dy³⁺ powders and other aids into acrylic emulsion. The bestprescription of the coating was obtained. The properties of luminescent coating weredetermined. The factors which affected the coating properties were discussed.更多还原