Abstract The spectroscopic properties of the gamma irradiated BaF2:Er3+ crystals were studied. BaF2:0.2 mol% ErF3 crystal was grown using the vertical Bridgman method. The Judd-Ofelt intensity parameters, Ωt (t = 2,4,6) for f-f transitions of Er3+ ions were determined from optical absorption spectra recorded before and after gamma irradiation at various doses. The influence of gamma irradiation dose on the Judd-Ofelt parameters and on the radiative transition probability, on the branching ration and on the radiative lifetime was also investigated. The predicted radiative lifetimes were compared with those measured and with those reported by other authors. Apart from the green and red emissions, arising under excitation at 378 nm, a new UV emission band around 321 nm was observed under excitation at 290 nm. This emission was not reported before. Using the Fuchtbauer-Ladenburg method, the emission cross section and optical gain parameter of the red and green emission band were calculated.

中文翻译：

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伽马辐照的 ErF3-DOPED BaF2 晶体的光谱特性

摘要 研究了伽马辐照BaF2:Er3+晶体的光谱特性。BaF2:0.2 mol% ErF3 晶体使用垂直布里奇曼法生长。Er3+ 离子的 ff 跃迁的 Judd-Ofelt 强度参数 Ωt (t = 2,4,6) 是根据不同剂量的伽马辐射前后记录的光学吸收光谱确定的。还研究了伽马辐射剂量对 Judd-Ofelt 参数和辐射跃迁概率、分支比和辐射寿命的影响。将预测的辐射寿命与测量的和其他作者报告的进行了比较。除了在 378 nm 激发下产生的绿色和红色发射外，在 290 nm 激发下观察到一个新的 321 nm 附近的紫外发射带。以前没有报告过这种排放。