摘要
以柠檬酸为络合剂，采用溶胶-凝胶法合成BaAl12O19：Tb荧光粉，通过X射线衍射（XRD）和荧光分光光度计对荧光粉的晶体结构和荧光性能进行检测。XRD分析结果表明：采用溶胶．凝胶制备工艺合成BaAl12O19：Tb，在1300℃可以得到BaAl12019纯相，掺杂浓度在0．5％-5mol％Tb^3＋均可取代Ba^2＋得到纯相的Ba1-xAl12O19：Tbx样品在240nm波长激发下，有380，415，440，489，543，585和621nm的一系列窄带发射峰，属于Th^3＋的^5D3^-7Fi（i=6，5，4）和^5D4-7Fj（j=6，5，4，3）跃迁发射。其中以位于543nm波长发射峰最强，489nm波长峰次之，其他均较弱。经1300℃晶化2h，Tb^3＋的掺杂浓度为2mol％时，得到的荧光粉体发光强度最好。
BaAl12O19：Tb phosphors were prepared by the sol-gel method, and their structure and luminescence properties were characterized by X-ray diffraction（XRD） and fluorescence spectrometry. The results of XRD analysis revealed that a BaAl12O19：Tb crystal structure was hexagonal. Pure phase of BaAl12O19 was obtained at 1300 ℃. And Tb^3 ＋ ions substituted Ba^2＋ ions into the BaAl12O19phase when x = 0. 005 - 0.05. The excitation spectrum of BaAl12O19：Tb exhibited a wide band at approximately 240 nm, originating fromthe 4f^8-4f^75d1 transition of Tb^3＋ . The emission spectrum consisted of 380, 415, 440, 489, 543, 585 and 621 nm emission peaks, originating from the 5D3-TFi （i=6, 5, 4） and 5D4-^7F：（j =6, 5, 4, 3） transitions of Tb^3＋ . The emission intensity of BaAl12O19 ：Tb phosphors at 543 nm was the strongest. The phosphors had high luminescence intensity when the phosphors were crystallized at 1300 ℃ for 2 h, and the concentration ofTb^3 ＋ was 2mol%.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2008年第5期547-551,共5页
Journal of the Chinese Society of Rare Earths
基金
辽宁省科技攻关项目(2006223004)
辽宁省教育厅优秀科技人次资助项目(2006R42)
