Sr_2SiO_4∶Eu^(2+)一维纳米棒的合成及性能研究

Preparation and Luminescent Properties of One-Dimensional Nanorods Sr_2SiO_4∶Eu^(2+) Phosphors

采用Stber工艺合成含SiO2微球的前驱体溶液,以其为原料合成了白光发光二极管(LED)用的荧光粉Sr2SiO4∶Eu2+。利用粉末X射线衍射(XRD)、能谱仪(EDS)和场发射扫描电镜(FE-SEM)对样品的结构和形貌进行了分析,发现这种方法合成出的Sr2SiO4∶Eu2+荧光粉具有一维纳米棒结构。同时还对影响此荧光粉发光性能的重要因素,包括煅烧温度、时间、激活剂浓度及助熔剂等相关参数进行了研究,在加入适量的助熔剂H3BO3和1300℃的还原气氛煅烧3h,Eu2+原子数分数为1.0%时得到的荧光粉且有最佳发光强度。同时发现Eu2+在α′-Sr2SiO4结构中占据两个不同的Sr格位,随浓度增加其发射峰有红移趋势,且不同格位的Eu2+之间存在共振型能量传递。

Phosphors Sr2SiO4 ：Eu2＋ with one-dimensional nanorod structure are prepared by a modified sol-gel method. The solution precursor containing SiO2 micro-spheres prepared by a St6ber method is used as raw materials to synthesize. These phosphors are characterized by X-ray diffraction （XRD）, field emission scanning electron microscope （FE-SEM） and energy disperse spectroscope （EDS）. It is found that uniform Sr2 Si04 ：Eu2＋ nanorods are synthesized by this method. Their luminescent properties are investigated. In addition, factors that affect their luminescent properties including the Eu2＋ ion concentration, heating time, sintering temperature and flux are also studied.