화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.132, No.19, 6618-6618, 2010
The Big Red Shift of Photoluminescence of Mn Dopants in Strained CdS: A Case Study of Mn-Doped MnS-CdS Heteronanostructures
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 T-4(1) -> (6)A(1) 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.