光学学报, 1997, 17 (11): 1503, 网络出版: 2006-10-31  

EuCl3·6H2O中Eu3+5D0-7F0跃迁的“反常”温度效应及其跃迁机制研究

Studies on "Abnormal" Temperature Effect and Transition Mechanism of 5D0-7F0 Transition of Eu3+ in EuCl3·6H2O
作者单位
中山大学超快速激光光谱学国家重点实验室, 广州 510275
摘要
研究了EuCl3·6H2O中Eu3+的5D0-7F0“禁戒”跃迁的机制及其“反常”温度效应。通过比较不同温度下荧光光谱中5D0-7F0跃迁和5D0-7F2跃迁第一条谱线的强度比,发现由于晶格振动,7F2态(主要是最低的一个次能级)通过四个频率为245cm-1的声子与7F0态耦合,使7F0态成为混合态,因而使5D0-7F0的跃迁成为可能,并且其振子强度随温度的变化而变化。从而很好地解释了EuCl3·6H2O中这一“禁戒”跃迁的机制及其跃迁振子强度随温度的变化关系。
Abstract
The transition mechanism and “abnormal” temperature effect of 5D 0 - 7F 0 transition of Eu 3+ in EuCl 3·6H 2O are studied. By analysing the intensity ratios of the 5D 0 - 7F 0 transition to the lowest energy level line of the 5D 0 - 7F 2 transition of fluorescence spectra at different tempertures, it is found that 7F 2 state (mainly the lowest energy level) can couple with 7F 0 state by four 245 cm -1 phonons. The 7F 0 state becomes a mixed state, so the “forbidden” 5D 0 - 7F 0 transition can be allowed and its oscillator strength varies with temperature. Therefore, the transition mechanism and the relationship between the oscillator strength of 5D 0 - 7F 0 transition in EuCl 3·6H 2O and temperature are well explained.

罗琦, 李润华, 孟建新, 周达君, 周建英. EuCl3·6H2O中Eu3+5D0-7F0跃迁的“反常”温度效应及其跃迁机制研究[J]. 光学学报, 1997, 17(11): 1503. 罗琦, 李润华, 孟建新, 周达君, 周建英. Studies on "Abnormal" Temperature Effect and Transition Mechanism of 5D0-7F0 Transition of Eu3+ in EuCl3·6H2O[J]. Acta Optica Sinica, 1997, 17(11): 1503.

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