Dynamics and microscopic origin of fast 1.5 μm emission in Er-doped SiO<inf>2</inf> sensitized with Si nanocrystals

Publication Type:
Journal Article
Citation:
Physical Review B - Condensed Matter and Materials Physics, 2011, 83 (15)
Issue Date:
2011-04-27
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We investigate the origin of fast 1.5 μm photoluminescence from Er-doped SiO 2 sensitized with silicon nanocrystals, which appears and decays within the first microsecond after a short laser excitation pulse. Time-resolved and temperature-dependent measurements on the 1.5 μm emission from Er-doped and Er-free samples reveal that the major part of this emission is Er related. A possible contribution from other photoluminescence bands, specifically of the defect-related band centered around 1.3 μm, has also been considered. All the results obtained indicate the dominant contribution of Er3 + ions to the fast 1.5 μm emission in the investigated materials. We propose two possible mechanisms behind the fast excitation and quenching of Er3 + 1.5 μm emission, which are both facilitated by Er-related trap centers with ionization energy of E A ∼60 meV. © 2011 American Physical Society.
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