SrF_2晶体中Ho^(3+)-Ho^(3+)离子对的上转换发光研究

Upconversion Fluorescence of Ho3+Ho3+ Pairs in SrF2 Crystal

究了在连续可调谐红色染料激光激发下，掺杂Ｈｏ３＋离子的ＳｒＦ２单晶中Ｈｏ３＋Ｈｏ３＋对的上转换发光特性。Ｈｏ３＋Ｈｏ３＋离子对的上转换发光主要分布于：强５Ｆ３→５Ｉ８跃迁４８０ｎｍ蓝色发射，较强５Ｓ２，５Ｆ４→５Ｉ８跃迁的５４０ｎｍ绿色发射。给出了ＳｒＦ２晶体中Ｈｏ３＋离子发射光谱中不同能级跃迁的谱峰及所对应的跃迁。通过对样品的激发，发射光谱和发光的上升、衰减等过程的分析，研究了发光中心的结构，分析了Ｈｏ３＋上转换发光的机制。

The upconversion properties of the Ho3+Ho3+ pairs in SrF2 single crystal were reported for the first time. Under red dye laser excitation between 620 and 650 nm, the Ho3+Ho3+ pair mainly gives rise to blue upconversion at about 480 nm which is attributed to the5F35I8 level transition of Ho3+ ion. Several other emissions were observed in the green, red and infrared regions. The emission peaks and the attributable transitions of Ho3+ in SrF2 crystal are given. The energy level diagram of this pair is established by analyzing the emission and excitation spectra. The structure of the paired luminescnet center is described with respect to crystal structure of the fluorAuthor itetype crystal.