Study on Cooperative Luminescence Quenching of Yb3+ and Li+ Co-doped CaF2
The CaF2:Yb3+ sample was prepared by a high-temperature solid-state method,and the sample was excited by near-infrared light,and the 3-Yb3+(cluster composed of 3 Yb3+)and 2-Yb3+(cluster composed of 2 Yb3+)appeared cooperative lumines-cence phenomenon.Doping Li+into the sample,with the increase of Li+ concentration,the cooperative luminescence of 3-Yb3+ and 2-Yb3+ clusters in the sample first continued to increase,and then began to decline.It can be concluded that doping Li+will lead to the destruction of the structure of 3-Yb3+ and 2-Yb3+,resulting in luminescence quenching.This luminescence quenching belongs to the static quenching caused by the change of the luminescence center.This result has great positive significance for improving the lu-minous efficiency of CaF2 laser materials.
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