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用同步辐射的真空紫外(VUV)和紫外(UV)作为激发源研究了Pr3+(0·1%)掺杂的LaF3纳米微晶/氟氧化物玻璃陶瓷的4f5d能级光谱性质。样品中存在两种不同的Pr3+-LaF3微晶中的Pr3+最低的4f5d能级在1S0能级之上,玻璃中的却在1S0能级之下,通过VUV和UV激发光谱得出这两种Pr3+最低的4f5d能级的位置。当用181nm光激发样品时,在发射光谱中同时观察到了微晶中Pr3+4f2→4f2的窄谱带发射和玻璃中4f5d→4f2的宽谱带发射。在20K时观察到了LaF3纳米微晶中作为Pr3+光子级联发射(PCE)第二步的3P0→3H4的跃迁,室温下却没有观察到,文中详细讨论了产生这种现象的原因。
The 4f5d spectroscopic properties of Pr3 + (0.1%) doped LaF3 nanocrystallites / oxyfluoride glass ceramics were investigated using synchrotron radiation VUV and UV. There are two different Pr3 + -LaF3 crystallites in the sample. The lowest 4f5d level of Pr3 + is above the 1S0 level but below 1 SO level in the glass. The two Pr3 + The lowest 4f5d level position. When the sample was excited with 181nm light, the narrow band emission of Pr3 + 4f2 → 4f2 in the crystallites and the wide band emission of 4f5d → 4f2 in the glass were simultaneously observed in the emission spectrum. The transition of 3P0 → 3H4 which is the second step of the Pr3 + photon cascade emission (PCE) in LaF3 nanocrystals was observed at 20K, which was not observed at room temperature. The reason for this phenomenon was discussed in detail.