Journal of the American Chemical Society 2010-05-19

The big red shift of photoluminescence of Mn dopants in strained CdS: a case study of Mn-doped MnS-CdS heteronanostructures.

Taisen Zuo, Zhipeng Sun, Yuliang Zhao, Xiaoming Jiang, Xueyun Gao

Index: J. Am. Chem. Soc. 132(19) , 6618-9, (2010)

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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 (4)T(1) --> (6)A(1) transition of Mn(2+) 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.