摘要
采用Stber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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2011年第11期215-219,共5页
Acta Optica Sinica
基金
国家自然科学基金(50802031)
教育部博士点新教师基金(20070487076)资助课题
关键词
材料
荧光粉
硅酸盐
纳米棒
发光二极管
materials
phosphor
silicates
nanorods
light-emitting diode