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Laser site-selective spectroscopy of Eu3+ ions doped Y4Al2O9

机译：Eu3 +离子掺杂Y4Al2O9的激光定点光谱

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摘要

Eu3+ doped Y4Al2O9 (YAM) crystals were prepared by the micro-pulling down method. Optical absorption and laser-selective-excitation techniques along with the luminescence decays have been used to reveal that Eu3+ ions in YAM occupy three distinct sites, which were characterized and discussed. The Stark energy levels of Eu3+ at three different sites in YAM were assigned from selectively excited emission spectra at 10 K. The intensity ratio of forced electric dipole (D-5(0) -> F-7(2)) and magnetic dipole (D-5(0) -> F-7(1)) transitions was discussed in order to obtain information about the degree of asymmetry of the luminescent centers. These results were confirmed by the luminescence lifetime measurements. The temperature dependent photo-luminescence spectra indicated that there is no energy transfer between different sites in the 10-300 K range. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过微拉法制备了Eu3 +掺杂的Y4Al2O9（YAM）晶体。已经使用光吸收和激光选择性激发技术以及发光衰减来揭示YAM中的Eu3 +离子占据了三个不同的位置，对此进行了表征和讨论。从10 K的选择性激发发射光谱中分配了YAM中三个不同位置的Eu3 +的斯塔克能级。强迫电偶极子（D-5（0）-> F-7（2））和磁偶极子（为了获得有关发光中心不对称度的信息，讨论了D-5（0）-> F-7（1））跃迁。这些结果通过发光寿命测量得到证实。与温度有关的光致发光光谱表明，在10-300 K范围内的不同位置之间没有能量转移。 （C）2016 Elsevier B.V.保留所有权利。

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