本研究制备了Tb3＋-Yb3＋共掺杂含CaF2纳米晶相的氟氧化物透明微晶玻璃,并通过XRD验证了CaF2纳米晶的形成。基于Tb3＋对Yb3＋的协同能量传递,通过激发Tb3＋∶5D4能级可观察到由Yb3＋∶2F5/2→2F7/2跃迁引起的950~1100nm近红外发射。利用积分球测试系统评价了Yb3＋在玻璃及微晶玻璃体系中的外量子效率,数据表明经过热处理后Yb3＋的外量子效率有明显的增加,这是由于在微晶玻璃体系中掺杂的Tb3＋离子和Yb3＋离子富集在具有低声子能量的CaF2晶相从而获得了更有效的能量传递而引起的。同时利用Tb3＋荧光寿命计算获得了材料的内量子效率,其值远大于外量子效率,这是由计算过程中的诸多近似所导致。
Tb3＋-Yb3＋ co-doped transparent oxyflouride glass ceramics containing CaF2 nanocrystals were prepared and the precipitation of CaF2 nanocrystals was proved by X-ray diffractormetry（XRD）.The infrared emission originated from Yb3＋：2F5/2→2F7/2 transition can be observed under the excitation of Tb3＋：5D4 energy level due to the cooperative energy transfer from Tb3＋ to Yb3＋.The external quantum yields of Yb3＋ in both the as-made glass and the glass ceramics were evaluated by using the integrating sphere measurement system,which indicates that Yb3＋ quantum yield was obviously increased after the heat treatment,this is due to the incorporation of Tb3＋ and Yb3＋ ions into the low phonon energy crystals of CaF2,which may facilitated the energy transfer.Meanwhile,the internal quantum yields were calculated with the measured Tb3＋ lifetimes,which is much bigger than the external quantum yields due to the calculating approximation.
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