摘要
利用提拉法生长了Si^(4+)共掺杂Yb∶YAG单晶,该晶体属于立方晶系,O_(h)^(10)-Ia3d空间群。掺杂的Si^(4+)没有改变YAG的晶体结构,但是影响了发光离子的价态。吸收光谱表明Si^(4+)的引入使得Yb^(2+)含量增多,这是由于Si^(4+)引入了过量的电荷,为满足电价平衡,Yb^(3+)转换为Yb^(2+)。Yb^(2+)的出现降低了Yb∶YAG的发光强度。稳态X射线激发发射光谱结果表明Si^(4+)共掺杂Yb∶YAG晶体的发光强度是Yb∶YAG的63%,γ射线激发下的光产额降至原来的40%。此外,由于原料中含有多种Yb的同位素,Yb∶YAG除了可以被X射线、γ射线激发出荧光外,还可以与中子发生核反应产生带电粒子,进而引起次级反应产生荧光。荧光的产生仍然由Yb^(3+)决定,因此,Si^(4+)掺入也降低了中子探测灵敏度。
The single crystals of Yb^(3+)-doped and Si^(4+)co-doped Y_(3)Al_(5)O_(12)(YAG)were grown by the Czochralski method.Both crystals belong to the cubic system with the O_(h)^(10)-Ia3d space group.The addition of Si^(4+) does not change their crystal structure,but changes the luminescent ions valent.The absorption spectrum manifests that the substitution of Al^(3+) by Si^(4+) leads to the transformation of Yb^(3+) to Yb^(2+) for the charge balance,and then reduces the luminous intensity of Yb∶YAG.The X-ray andγ-ray excited luminescence(XEL)measurement shows that the luminous intensity of Si^(4+)co-doped Yb∶YAG is about 63%and 40%of Yb∶YAG,respectively.Additionally,because of the isotope of Yb,Yb∶YAG can even be excited by neutrons with nuclear reaction,the charge particles cause secondary reactions to produce fluorescence.The fluorescence intensity is still determined by Yb^(3+),thus the sensitivity for neutron is also reduced by Si^(4+) co-doping.
作者
田瑞丰
张璐
潘明艳
齐红基
TIAN Ruifeng;ZHANG Lu;PAN Mingyan;QI Hongji(Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《人工晶体学报》
CAS
北大核心
2021年第10期1957-1962,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(52072183,52002386)。
