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(a) Theoretical structure model for Mn-doped ZnSe -dots via nucleation-doping technique. The MnSe core is in diameter. There is a diffusion layer with between radius and the MnSe core radius . The amount of Mn ion diffusion depends on the temperature in synthesis and NC size (bigger NC needs longer synthesis time at temperature ). (b) The relevant energy levels of ions embedded in the ZnSe NC.
PL spectra for Mn-doped ZnSe NCs with different sizes; (b) PLE spectrum of Mn-doped ZnSe NCs ( diameter).
Measured PL decay curves at wavelength near by using (a) an optical chopper and oscilloscope giving the slow time decay component in the millisecond time scale; (b) time-correlation photocounting system measuring fast decay time components in nanosecond and hundred nanosecond time scales. The PL intensity measured in (b) is much weaker than in (a).
Measured radiative lifetime components near for different size Mn-doped ZnSe -dots. (a) The slow decay component from ions in ZnSe crystal field; (b) the fast decay components due to the ZnSe host emission at (square dot curve) and due to host trap states or self-activated emission of ion pairs at longer wavelength (triangle dot curve).
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