In this work, we report the study of energy transfer between Nd 3+ and Yb3+ ions in GeS2-Ga2S 3-CsCl chalcohalide glasses at room temperature by using steady-state and time-resolved laser spectroscopy. The study includes absorption, emission, and excitation spectra, as well as lifetime measurements. The presence of Yb3+ emission after excitation in the 4F5/2 level of Nd3+ together with the 4I9/2 → 4F5/2 and 4I9/2 → 4F3/2 bands of Nd3+ in the excitation spectra of Yb3+ ions confirm that energy transfer occurs from Nd3+ to Yb3+. The transfer efficiency was investigated fromthe emission spectra. Back transfer from Yb3+ to Nd3+ was also observed in the emission spectra of the codoped samples after excitation of Yb 3+ ions. © 2012 Elsevier B.V. All rights reserved.

This work was supported by the Spanish Government under projects MAT2009-14282-C02-02, and ConsoliderCSD2007-00013 (SAUUL), and the Basque Country Government (IT-331-07).

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