Luminescence Concentration Quenching Mechanism in Gd2O3:Eu3+.
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- 作者：Octavio Meza ; E. G. Villabona-Leal ; L. A Diaz-Torres ; H. Desirena ; J. L. Rodr铆guez-L贸pez ; El铆as P茅rez
- 刊名：Journal of Physical Chemistry A
- 出版年：2014
- 出版时间：February 27, 2014
- 年：2014
- 卷：118
- 期：8
- 页码：1390-1396
- 全文大小：400K
- 年卷期：v.118,no.8(February 27, 2014)
- ISSN：1520-5215
文摘
Luminescence concentration quenching in Gd2O3:Eu3+ nanocrystals results from strong interactions among O2鈥?/sup> ions and Eu3+ ions. Because all synthesized Gd2O3:Eu3+ nanocrystals present the same cubic crystalline phase regardless of Eu3+ concentration, it is possible to study the optical properties as a function of the dopant concentration. The emission intensities and lifetime curves for Gd2O3:Eu3+ were analyzed by a simple rate equation model to study the interaction between the O2鈥?/sup> ions and Eu3+ ions. The rate equation model considers that such interaction is driven by the following energy transfer processes: the direct energy transfer (O2鈥?/sup> 鈫?Eu3+), back-transfer (Eu3+ 鈫?O2鈥?/sup>), and direct energy migration (Eu3+ 鈫?Eu3+). The exact solution of this model agrees with the experimental results, luminescence concentration quenching is reproduced and the corresponding energy transfer rates are reported. Quantitative results suggest that the direct energy transfer and direct energy migration processes are the main responsible for the luminescence concentration quenching, whereas the back-transfer process promotes the Eu3+ emission.