Mid-IR spectroscopy of Fe:ZnSe quantum dots

NoSoung Myoung; Jung Su Park; Alan Martinez; Jeremy Peppers; Sang-Youp Yim; Won Seok Han; Vladimir V Fedorov; Sergey B Mirov

doi:10.1364/OE.24.005366

Mid-IR spectroscopy of Fe:ZnSe quantum dots

Opt Express. 2016 Mar 7;24(5):5366-5375. doi: 10.1364/OE.24.005366.

Authors

NoSoung Myoung, Jung Su Park, Alan Martinez, Jeremy Peppers, Sang-Youp Yim, Won Seok Han, Vladimir V Fedorov, Sergey B Mirov

PMID: 29092360
DOI: 10.1364/OE.24.005366

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 ⁵E↔⁵T₂ transition of Fe²⁺ 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 (τ_rad) 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.