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首页> 外文期刊>Physica, B. Condensed Matter >Optical studies of Eu~(3+) ions in Bi_4Ge_3O_(12) crystals
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Optical studies of Eu~(3+) ions in Bi_4Ge_3O_(12) crystals

机译：Bi_4Ge_3O_（12）晶体中Eu〜（3+）离子的光学研究

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摘要

Optical absorption and luminescence spectra of Eu~(3+) ions in bismuth germanate Bi_4Ge_3O_(12) crystal have been investigated at not only room temperature but also 16 and 10K, respectively. Sharp absorption lines of Eu~(3+) are observed in the spectral region of 350-3300 nm, which are due to the transition from the ~7F_o ground state. The level assignment has been made for these lines. The luminescence spectra due to the ~5D_0 -> ~7F_J(J = 1, 2, 3, 4, 5, 6) transitions are observed under the excitation from the ground state to the ~5D_0 state. The luminescence decay time is estimated to be 1.76 and 1.55 ms at 10 K and room temperature, respectively. Vibration structure is observed in the luminescence spectrum due to the ~5D_0 -> ~7F_1 and ~7F_2 transitions. From the optical spectra, it is confirmed that Eu~(3+) ions occupy Bi~(3+) sites with C_3 point symmetry.
机译：研究了锗酸铋Bi_4Ge_3O_（12）晶体中Eu〜（3+）离子的吸光和发光光谱，不仅在室温下，而且分别在16K和10K下。在350-3300 nm的光谱区域内观察到Eu〜（3+）的清晰吸收线，这是由于从〜7F_o基态跃迁所致。已经为这些行进行了级别分配。在从基态到〜5D_0的激发下，观察到〜5D_0->〜7F_J（J = 1，2，3，4，5，6）跃迁引起的发光光谱。在10 K和室温下，发光衰减时间估计分别为1.76和1.55 ms。由于〜5D_0->〜7F_1和〜7F_2跃迁，在发光光谱中观察到振动结构。从光谱证实，Eu〜（3+）离子以C_3点对称占据Bi〜（3+）位置。

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