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首页> 外文期刊>The Journal of Chemical Physics >Analysis of absorption and luminescence spectra of U3+ doped Cs2NaYCl6 and Cs2LiYCl6 single crystals
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Analysis of absorption and luminescence spectra of U3+ doped Cs2NaYCl6 and Cs2LiYCl6 single crystals

机译：U3 +掺杂的Cs2NaYCl6和Cs2LiYCl6单晶的吸收和发光光谱分析

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摘要

Uranium(3+) doped single crystals of Cs2NaYCl6 and Cs2LiYCl6 with a 2.0% and 0.1% U3+ concentration have been obtained by the Bridgman-Stockbarger method. Luminescence spectra of the crystals were recorded at 160, 70, and 15 K. The emission bands observed in the visible and near infrared regions have been assigned to transitions from the lowest components of the I-4(11/2), F-4(3/2), and (4)G(7/2) multiplets to the crystal-field components of the I-4(9/2) ground level. Absorption spectra were recorded from 4 000 to 25 000 cm(-1) at 4.2 K. The zero phonon transitions were identified from an analysis of the vibronic side bands as well as in least-squares fits by applying a semiempirical Hamiltonian representing the combined atomic and crystal-field interactions for an ion of-the 5f(3) configuration and O-h symmetry. Eight energy level parameters were varied simultaneously in the least-squares adjustments yielding a mean error of 57 and 61 cm(-1) for U3+:Cs2LiYCl6 and U3+:Cs2NaYCl6, respectively. The analysis of the spectra enabled the assignment of 25 crystal field levels for U3+:Cs2NaYCl6 and 27 for U3+:Cs2LiYCl6. The received total splitting of the ground level is equal to 625 and 595 cm(-1), respectively. (C) 1998 American Institute of Physics. [References: 26]
机译：通过Bridgman-Stockbarger方法获得了Us +浓度为2.0％和0.1％的Cs2NaYCl6和Cs2LiYCl6铀（3+）掺杂单晶。在160、70和15 K下记录了晶体的发光光谱。在可见光和近红外区域观察到的发射带已被指定为从I-4（11/2），F-4最低组分的跃迁（3/2）和（4）G（7/2）乘以I-4（9/2）地平面的晶体场分量。在4.2 K下记录了从4000到25000 cm（-1）的吸收光谱。零声子跃迁是通过应用代表复合原子的半经验哈密顿量对振动电子边带以及最小二乘拟合分析而确定的与5f（3）构型和Oh对称性的离子的晶体场相互作用。在最小二乘调整中同时更改了八个能级参数，分别导致U3 +：Cs2LiYCl6和U3 +：Cs2NaYCl6的平均误差分别为57和61 cm（-1）。光谱分析能够为U3 +：Cs2NaYCl6分配25个晶场能级，为U3 +：Cs2LiYCl6分配27个晶场能级。接收到的地面总劈裂分别等于625和595 cm（-1）。 （C）1998美国物理研究所。 [参考：26]

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