Executive Summary : | This project aims to investigate the excited state dynamics of doped semiconductor nanomaterials for photonic applications through the study of MCPL, that is an effective probe to study the excited state polarizations. The coupling between band electrons and local magnetic moments underpins many fascinating phenomena in quantum chemistry. In semiconductors, these couplings are simply realized and often studied in diluted magnetic semiconductors (DMS), where the strong sp-d exchange interactions between electron-hole spins and the embedded magnetic atoms (typically Mn) can lead, for example, to giant exciton g factors, magnetic polarons, or carrier-mediated ferromagnetism in II–VI, III–V semiconductor and perovskite halide materials. Recent studies indicate substantial influence arising non-interacting dopant atoms and suggest that the sp-d exchange ‘‘constants’’ can be modified through quantum confinement and/or by spin orbit interaction. However, the effect of these interactions on excited state dynamics has not been studied extensively. These interactions could lead to potentially important magneto-optical effects that could play an important role in quantum optics. For example, it has been shown earlier that magnetic field could have a definitive influence on the polarization of the characteristic feature of Mn doped semiconductors, namely, the prominent yellow emission at 2.1 eV. However, although interaction of Mn and other dopants have been studied extensively, the influence of polarization has not been studied. In this project, we aim to study the excited state dopant interactions with the host leading to probable applications such as quantum polarizers, memory and such similar applications. |