摘要
采用溶胶凝胶法制备了纳米微晶Ｘ１Ｙ２ＳｉＯ５∶Ｅｕ，研究了室温和１５Ｋ下的光致发光特性．透射电子显微镜的测量结果表明，样品的平均粒径为５０ｎｍ．通过低温下的格位选择激发，分别得到Ｘ１Ｙ２ＳｉＯ５∶Ｅｕ中两种格位的Ｅｕ３＋离子各自的光致发光光谱，确定了谱峰位置．在格位选择激发下，两种格位的发光衰减均呈很好的单指数关系，５Ｄ０能级的寿命分别为３００和２１８ｍｓ．
Abstract Nanometric Scale X 1 Y 2SiO 5∶Eu was prepared by sol gel method with particle size about 50nm.The optical properties of the sample were investigated.Its luminescence spectra were recorded at room temperature and 15K using site selective excitation by a dye laser in addition to conventional UV excitation.Site selective excitation gave two sites for the Eu 3+ ion in X 1 Y 2SiO 5.These two sites differ significantly from each other as stated by their emission spectra.Wavelengths of the 5 D 0→ 7 F 0—4 transitions of the two sites were tabulated.Lifetimes of the 5 D 0 energy level were also measured. They are 3.00ms (site 1) and 2.18ms (site 2).
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第7期1207-1212,共6页
Acta Physica Sinica
基金
国家自然科学基金
国家教育委员会留学回国人员科学研究启动基金
中国科学院留学经费择优支持基金
