溶胶-凝胶法制备纳米晶γ-Al2O3：Tb^3＋粉末及其发光性能  

Photoluminescence Properties of Nanocrystalline γ-Al_2O_3∶Tb^(3+) Powder Prepared by Sol-gel Method

作　　者：石涛[1] 周箭[1] 申乾宏[1] 杨辉[1,2] 

机构地区：[1]浙江大学材料科学与工程学系,浙江省杭州310027 [2]浙江加州国际纳米技术研究院,浙江省杭州310029

出　　处：《硅酸盐通报》2009年第2期224-228,共5页Bulletin of the Chinese Ceramic Society

基　　金：浙江省重大科技计划项目(No.2006C11029)

摘　　要：以异丙醇铝为原料,聚乙二醇(PEG1000)为络合剂,采用溶胶-凝胶法制备了纳米晶γ-Al2O3∶Tb3+发光粉;并采用DTA/TG、XRD、TEM及荧光光谱对其进行了一系列表征。研究结果表明:采用溶胶-凝胶制备工艺,经800℃煅烧4h,可以得到发光强度高的纳米晶γ-Al2O3∶Tb3+发光粉;发光粉的最佳激发波长为251nm,对应于Tb3+4f-5d跃迁;最佳掺杂浓度为5%(物质的量浓度,下同),在251nm光激发下,最强的发射峰位于544nm,可以用作绿色发光材料。Nanoerystalline γ-Al2O3：Tb^3＋ phosphors were prepared in sol-gel method with a eomplexing agent named polyethylene glycol （ PEG1000 ） using aluminum isopropoxide （Al（OC3H^i7）3） as raw materials. The nanocrystalline phosphors were characterized by differential thermal analysis/ thermogravimetric analysis, X-ray diffraction, transmission electron microscope and luminescence spectra as well. The results show that the nanocrystalline γ-Al2O3：Tb^3＋ phosphors calcined at 800℃ for 4 h has high luminescence intensity, the optimum excitation wavelength is 25.1nm, ascribes to the Tb^3＋ 4f-5d transition, the optimum concentration of Tb^3＋ dopant is 5% , and the main emission is at 544 nm under excitation at 251 nm. The prepared nanocrystalline γ-Al2O3：Tb^3＋ powder can be used as green phosphor.

关 键 词：溶胶-凝胶法 γ-Al2O3∶Tb3+ 纳米晶 发光粉 光致发光 

分 类 号：O648[理学—物理化学]