Investigation of saturation and excitation behavior of 1.5 μm emission from Er<sup>3+</sup> ions in SiO<inf>2</inf> sensitized with Si nanocrystals

Publication Type:
Journal Article
Citation:
Physica Status Solidi (C) Current Topics in Solid State Physics, 2012, 9 (12), pp. 2312 - 2317
Issue Date:
2012-12-01
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Using time-resolved photoluminescence spectroscopy we investigated the 1.5 μm emission from Er 3+ ions embedded in SiO 2 matrix sensitized with Si nanocrystals. Temporal characteristics are analyzed as the function of excitation powers and temperatures. We confirm the predominance of two excitation channels - a fast one, with nanosecond dynamics, and a slow one, taking place on the microsecond time scale. Upon increasing excitation power, the fast mechanism saturates and further increase of total photoluminescence intensity is facilitated by the slow energy transfer process. Consequences of this finding on the microscopic modeling of the excitation process are discussed. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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