低温共沉淀法合成红色荧光粉CaCO_3:Eu^(3+)  

Preparation of the red phosphor CaCO_3:Eu^(3+) by lower temperature co-precipitation method

作　　者：康明[1,2] 刘军[1,3] 孙蓉[1,2] 燕文清[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]先进建筑材料四川省重点实验室,四川绵阳621010 [3]深圳市海洋王照明科技股份有限公司,广东深圳518052

出　　处：《功能材料》2009年第8期1258-1262,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10476024);四川省科技厅资助项目(2006J13-059);四川省教育厅重点资助项目(2006A094);先进建筑材料四川省重点实验室培育基金资助项目(08zxxp10)

摘　　要：采用低温共沉淀法直接合成红色荧光粉CaCO3∶Eu3+,利用X射线衍射(XRD),电子扫描电镜(SEM)和荧光光谱(PL-PLE)等仪器对样品的结构、形貌和发光性质进行表征。同时,研究了反应温度和Eu3+离子掺杂量对样品性能的影响。结果表明:通过改变工艺条件可以合成球形、立方体和针状等不同形貌的样品。Eu3+作为发光中心进入到文石型或方解石型CaCO3的晶格中,其最佳掺杂量1.0%(摩尔分数)。激发峰主要由电荷迁移态和Eu3+离子的特征激发跃迁组成。发射峰以电偶极跃迁5D0→7F2为主,Eu3+离子未处于严格对称的格位。样品的形貌,结晶度和物相均对发光强度有较大的影响,光滑的针状的文石型样品的发光强度最高。反应温度不同,样品的发光强度不同,其最佳的反应温度为60℃。The aragonite and calcite red phosphors CaCO3： Eu^3＋ have been prepared by lower temperature coprecipitation method without further sintering treatment. The structure, morphology, and spectroscopic properties of the samples were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, photoluminescence and photoluminescence excitation spectra （PL-PLE） spectra, respectively. Also, the influences of factors, such as the reaction temperature and Eu^3＋ doping concentration, on the properties were investigated in detail. The results indicate that the different morphology of sample, including the spheroid, cube and needle-like shapes, was synthesized by changing the reaction conditions. The Eu^3＋ ions as luminescent centers substitute for Ca^3＋ sites in the crystal structure of CaCO3. The excitation spectrum consists of a main intense band and some weak sharp lines, which is attributed to the charge transfer transition of Eu^3＋-O^2- and intra-configurational 4f-4f transitions of Eu^3＋ , respectively. The maximum emission wave length is 614nm, corresponding to electric dipole transition 5 D0→2 F2 of Eu^3＋ , indicting that Eu3＋ ions not locate in strict symmetric position of the crystal lattice. The best reaction temperature and the optimal concentration of Eu^3＋ were 60℃ and 1.0 mol%, respectively, under which the aragonite with good crystallinity and highest PL intensity of 614nm appeared.

关 键 词：CaCO3:Eu^3+ 共沉淀 红色荧光粉 

分 类 号：O482.3[理学—固体物理]