摘要
研究了Y2O2S∶Tb纳米晶的发光性质和能量传递过程,根据浓度猝灭曲线分析了纳米Y2O2S中引起5D3和5D4能级浓度猝灭的相互作用类型分别为电偶极-电偶极和交换相互作用。纳米Y2O2S中Tb离子的5D3-7F5跃迁的发光寿命与相同掺杂浓度的体材料相比明显缩短,根据引起浓度猝灭的相互作用类型对发光衰减曲线进行拟合,得到理论和试验一致的结果。
The luminescence properties and energy transfer Of Y2O2S: Tb nanocrystals were studied. The dominant mechanism of the quenching of D-5(3) and D-5(4) Tb3+ emission was discussed. The dipole-dipole interaction is considered to play a dominant role in the quenching of D-5(3) e-mission. The exchange coupling between Tb3+ ions in the nearest or next the nearest neighbor positions quenches the emission of D-5(4) energy level. In the same Tb3+ concentration, the luminescence decay time of the Y2O2S: Tb nanocrystals is shorter than that of bulk material. We fit the luminescence decay curve by the Inokuti-Hirayama theory.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第7期522-525,共4页
Rare Metal Materials and Engineering
