The Big Red Shift of Photoluminescence of Mn Dopants in Strained CdS: A Case Study of Mn-Doped MnS−CdS Heteronanostructures
- 28 April 2010
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 132 (19), 6618-6619
- https://doi.org/10.1021/ja100136a
Abstract
The red photoluminescence of Mn dopants in MnS−CdS heteronanostructures has been observed for the first time. The red photoluminescence at 650 nm derives from emission due to the 4T1 → 6A1 transition of Mn2+ dopants in a CdS matrix exposed to gigapascal-level lattice stress. HRTEM, FFT, XRD, and optical studies revealed that the lattice of Mn-doped CdS is compressed to match that of MnS when CdS crystallizes at the MnS surface to form MnS−CdS heteronanostructures. The photoluminescence decay times of such Mn dopants are on the order of nanoseconds because of the spin-flip interactions between Mn dopants and free carriers in the CdS matrix.Keywords
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