Mid-IR spectroscopy of Fe:ZnSe quantum dots

Optics Express
NoSoung MyoungSergey B Mirov

Abstract

We report spectroscopic characterization of Fe:ZnSe quantum dots (for 2% of Zn/Fe molar ratio) fabricated by microemulsion hydrothermal synthesis. Mid-IR photoluminescence of the (5)E↔(5)T2 transition of Fe(2+) ions over 3.5-4.5 μm spectral range was observed in Fe:ZnSe quantum dot samples and kinetics of luminescence have been characterized at temperatures of 30-300 K under direct (2.788 μm) mid-IR excitation and indirect (0.355 μm) photoionization excitation. The radiative lifetime (τrad) was estimated from these measurements to be 48 µs while lifetime at room temperature was measured to be 440 ns. This agrees closely with the behavior of bulk material.

References

Sep 15, 1985·Physical Review. B, Condensed Matter·M Godlewski, M Skowronski
Dec 15, 1986·Physical Review. B, Condensed Matter·A Zakrzewski, M Godlewski
Jul 8, 2005·Nature·Steven C ErwinDavid J Norris
Nov 27, 2006·Optics Express·A GallianA I Lalayants
Nov 11, 2010·Nano Letters·Laura Martinez MaestroJosé García Solé
Jan 7, 2011·Optics Letters·NoSoung MyoungSergey B Mirov
Jan 17, 2012·Sensors·Lijia ShaoFeng Yan

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