摘要
采用溶胶-凝胶法制备了Lu2SiO5:Ce粉体。基于X射线衍射、透射电镜、紫外-可见激发发射、X射线激发发射和荧光衰减时间的测试,研究了溶胶-凝胶法制备的纳米Lu2SiO5:Ce粉体的物相结构和发光性能。结果表明:在1000℃煅烧2h得到粒径约为40nm的纯Lu2SiO5:Ce粉体;其激发谱中的最强激发峰在360nm处,发射谱中在398～407nm范围有以407nm为中心的宽发射峰,归因为Ce3+的4f-5d间的电子跃迁。在X射线激发下Lu2SiO5:Ce粉体的发光表现出二级发光衰减行为,衰减时间分别为τ1=10.98ns和τ2=39.32ns,相应的发光强度比例分别为73.38%和21.29%。
Cerium-doped lutetium silicate（Lu2SiO5：Ce） powder was prepared by the sol-gel method.Based on the measurements of X-ray diffraction,transmission electron microscopy,photoluminescence,X-ray excitated emission and luminescence decay time,the phase structure and luminescence properties of the nano-scale Lu2SiO5：Ce powder were investigated.The results show that the pure crystalline Lu2SiO5：Ce with uniform size of about 40 nm is obtained after calcined at 1 000 ℃ for 2 h.The strongest excitation peak of Lu2SiO5：Ce powder locates at 360 nm in excitation spectra,and a broad emission peak with a centric wavelength of 407 nm is located at around 398-407 nm in the emission spectra excitated by 360 nm,which corresponds to the typical 4f-5d electronic transitions of Ce3＋.The X-ray excitated emission spectra exhibit that the Lu2SiO5：Ce powder has short decay luminescent behaviors,and the two fitted decay time τ1 and τ2 reach 10.98 and 39.32 ns,which account for the luminescence intensity of 73.38% and 21.29%,respectively.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第10期1931-1936,共6页
Journal of The Chinese Ceramic Society
基金
上海科委基础研究重点项目(9JC1406500)
上海市自然科学基金(10ZR1411400)
上海市重点学科(S30107)
2008上海大学创新基金资助项目
关键词
硅酸镥
纳米粉体
荧光发光
衰减时间
lutetium oxyorthosilicate
nanometer powder
fluorescence
decay time
