【作者】 卢利平；

【导师】 张希艳；

【作者基本信息】 长春理工大学 ， 材料物理与化学， 2002， 硕士

【摘要】 20世纪90年代，新型长余辉发光材料SrAl₂O₄：Eu²⁺，Dy³⁺问世，取代了传统的ZnS型长余辉发光材料，受到了国内外广泛的关注。近几年，已能成功地制备出性能优异的SrAl₂O₄：Eu²⁺，Dy³⁺光致发光粉体，但是，在制备方法上，仍然仅仅局限于传统的固相反应法。至于用其它方法能否成功制备出该发光材料，还少见报道。溶胶-凝胶法具有化学均匀性好、颗粒细小、计量准确等优点。本文采用溶胶-凝胶法（Sol-Gel法）成功制备了发光性能优异的SrAl₂O₄：Eu²⁺，Dy³⁺长余辉光致发光材料。该方法较传统的固相反应法明显、有效的降低了反应烧成温度，且产品具有粒径小而均匀的优点。据目前查证，尚未见用Sol-Gel法合成的SrAl₂O₄：Eu²⁺，Dy³⁺纳米发光材料的报道。本文首次提出，采用Sol-Gel法制备纳米尺度的SrAl₂O₄：Eu²⁺，Dy³⁺长余辉发光材料。 本文系统地研究了Sol-Gel法制备SrAl₂O₄：Eu²⁺，Dy³⁺发光材料的一系列工艺条件。讨论了pH值对于Sol、Gel的形成及质量的影响；讨论了灼烧温度和灼烧时间对于产品发光性能及粒径的影响；同时对SrAl₂O₄：Eu²（+），Dy³⁺发光材料的发光机理、发光特性作了探讨。 对样品进行了X射线衍射分析（XRD）、扫描电镜分析（SEM）、透射电镜分析（TEM）、激发光谱、发射光谱和发光余辉测定、差热-热重曲线分析，制备出的SrAl₂O₄：Eu²⁺，Dy³⁺纳米发光材料属于SrAl₂O₄单斜晶系晶体结构；激发光谱是峰值位于240，330，378和425nm的宽带谱；发射光谱是峰值位于523nm的宽带谱，余辉时间长。同时，用Sol-Gel法制备的SrAl₂O₄：Eu²⁺，Dy³⁺纳米发光材料又具备了传统方法制备的发光材料所没有的优点：产品颗粒细、粒径均匀、烧成温度低等。溶胶-凝胶法合成SrAl₂O₄：Eu²⁺，Dy³⁺发光材料的成功，不但为SrAl₂O₄：Eu²⁺，Dy³⁺拓展了新的合成技术，也由于制备出了纳米粉体，从而开辟了在纳米尺度上研究SrAl₂O₄：Eu²⁺，Dy³⁺各种性质的新领域。更多还原

【Abstract】 Since the new long persistent phosphorescent SrAl2O4. Eu2+, Dy3+ phosphor was invented in the 1990s, it takes the place of the conventional long persistent phosphorescent ZnS: Cu2+ phosphor, and it is followed with interest at home and abroad. In recent years, SrAl2O4: Eu2+, Dy3+ phosphor with excellent physical-chemical properties has can be synthesized successfully. But, as far as the method of synthesis is concerned, it still mainly focuses on the conventional high temperature solid state reaction method. In present, few research work has been carried out to prepare SrAl2O4:Eu2+,Dy3+ through other methods. Sol-Gel method has some advantages over the conventional method. For example, the synthesis is done at the molecular leval producing very pure products and the synthesis temperature can be lower. In this paper, SrAl2O4:Eu2+,Dy3+ phosphor with good photoluminescence properties was synthesized successfully through Sol-Gel method. Be compared with conventional solid state method, the reaction temperature can be greatly decreased. The grain size of the sample is small- and well distributed. As we know now, SrAl2O4:Eu2+,Dy3+ nano-particle phosphor through Sol-Gel method hasn’t been reported yet. This paper firstly puts forward that SrAl2O4:Eu2+Dy3+ nano-particle phosphor can be prepared through Sol-Gel method.In this paper, a series of preparation conditions with Sol-Gel method were systematically studied. It is concerned with the effect of pH on the sol and gel formation and quality and the effect of sintering temperature and time on the luminescence properties and grain size of the samples. At the same time, the phosphorescent mechanism was discussed.XRD patterns, SEM and TEM photos, excitation spectrum, emission spectrum, decay curves and TG-DTA curves have been measured on the sample. SrAl2O4:Eu2+,Dy3+ nano-particle phosphor synthesized is withmonoclinic SrAl2O4 crystal structure. Excitation spectumn is a broad band peaking at 240,330,378 and 425nm. Emission spectrum is also a broad band peaking at 523nm. The samples show afterglow luminescence for a verylong time. The grain size is small and well distributed. The sintering temperature is lower. The SrAl2O4:Eu2+,Dy3+ nano-particle phosphor was successfully prepared by the Sol-Gel method. This will not only develop a new synthesis technology but also begin a new field of studying various properties of SrAl2O4:Eu2+,Dy3+ on nanometer size particles.更多还原