【作者】 李卫珍；

【导师】 葛明桥；

【作者基本信息】 江南大学 ， 纺织工程， 2009， 硕士

【摘要】 SrAl₂O₄: Eu²⁺, Dy³⁺是20世纪90年代开发的新型功能材料。SrAl₂O₄: Eu²⁺, Dy³⁺是以铝酸锶为基质,掺杂Eu、Dy作为激活剂的一种优质的铝酸盐体系夜光材料。这类夜光材料不含任何放射性元素,无毒无害。因其性能优越,成为近年来生产量最大,应用范围最广的夜光材料。但随着稀土铝酸锶夜光材料的应用领域的扩大,其性能已不能满足实际使用的要求。稀土铝酸锶夜光材料需改进的方面有:1.余辉衰减太快,衰减后期余辉亮度不够;2.颜色种类较少;3.需在保证夜光材料亮度的情况下,减小其粒径。所以需改进夜光材料的制备工艺,以此提高其各方面性能,使铝酸锶夜光材料更好地应用于各个领域。夜光材料的发光性质在很大程度上取决于基质材料的组成和合成工艺条件,所以要提高SrAl₂O₄: Eu²⁺, Dy³⁺的光学性能,关键在于合理选择原料和工艺条件。首先,通过理论分析,比较了高温固相法、溶胶一凝胶法、微波热合成法、共沉淀法,燃烧合成法、喷雾干燥法等方法的优缺点,从环保、成本和制成品性能等方面考虑,初步选择高温固相法和微波热合成法作为实验方法。然后分别用高温固相法和微波热合成法试制SrAl₂O₄: Eu²⁺, Dy³⁺,并测试制成品性能,因高温固相法合成的材料光学性能远远高于微波热合成法制备的材料光学性能。决定选用高温固相法合成SrAl₂O₄: Eu²⁺, Dy³⁺。使用高温固相法合成夜光材料,对原料混合均匀性要求高,为此采用新的方法对原料进行预处理,改善了高温固相法原料混合不均的问题。原料经过预处理后,采用高温固相法合成掺杂稀土的铝酸锶夜光材料,通过测试分析材料的晶相组成、激发光谱、发射光谱和余辉性能,研究了不同工艺条件对稀土铝酸锶夜光材料光学性能的影响。实验结果表明,预处理工序是制备材料的前提,新的预处理方法有效地改善了余辉性能;原料配比影响晶相组成和发光颜色;激活剂的种类和含量影响荧光光谱和余辉性能;烧结温度和助熔剂含量主要影响晶相组成和余辉性能。最后通过反复实验得到了较为理想的原料配比和较合理的工艺参数。更多还原

【Abstract】 SrAl₂O₄: Eu²⁺, Dy³⁺ is a new functional material which was developed in the the 90’s of the 20th Century. SrAl₂O₄: Eu²⁺, Dy³⁺ is a kind of aluminate system luminous materials which doped Eu, Dy into strontium aluminate, it have high performance. Rare-earth strontium aluminate luminous materials is free from radioactivity, nontoxic and harmless. The properties of this kind of material is so good that it have the largest output and applied range in the past few years. The rare-earth strontium aluminate luminous materials should be improved from three contents: 1.Luminous intensity is not large enough; 2. The number of colour is little; 3. The grain size of materials should be minish without losing luminous intensity. As a result, It is necessary to improve the process in order to uprate the luminescent properties of the rare-earth strontium aluminate luminous materials which will be applied extensively in a lot of professions.The luminance of luminous materials mostly depend on component element of host material and preparation technology conditions. The key of improving the luminescent properties is to choose right raw material and technological parameter properly.Firstly compare relative merits of different methods such as solid phase reaction, sol-gel preparation, microwave synthesis coprecipitation method, Hydriding combustion synthesis, and spray drying process through theoretical analyzing. To consider in the fields of environmental protection, prime cost and the luminance properpties of materials, preliminary choose solid phase reaction and microwave synthesis. Secondly trial-produce SrAl₂O₄: Eu²⁺, Dy³⁺ by solid phase reaction and microwave synthesis, test the luminance properpties of products. The luminance properpties of products made by solid phase reaction is further better than which made by microwave synthesis, so we decide to produe SrAl₂O₄: Eu²⁺, Dy³⁺ by solid phase reaction.Because of the important of uniformity of raw material when produce materials by solid phase reaction, we pretreated raw materisls in new ways, improve the uniformity effectively. Raw material was pretreated in new ways, then the rare-earth strontium aluminate luminous materials were produced by solid phase reaction method. The phase composition, excitation spectrum, emission spectrum and phosphorescence properties of luminous material were tested. To study influence of process conditions on luminescent properties of the rare-earth strontium aluminate luminous materials. The experimental results indicate that the pre-processing is premise of the synthesis of luminous material, new pre-processing improve luminescent properties of the rare-earth strontium aluminate luminous materials effectively, raw material ratio effect on phase composition and luminescent color, the sintering temperature and flux content effect on phase composition and luminescent properties. The species and contents of activating agent effect on excitation spectrum, emission spectrum and phosphorescence properties. The best component proportion of luminous materials were found after lots of trial and error, good technology has been gotten through many experimentations.更多还原