A Model on the Mn^2＋ Luminescence Band Redshift with Mn（Ⅱ） Doping and Aggregation within CdS＇Mn Microwires

We report the microphoto-luminescence band redshifts with individual and multi-Mn（Ⅱ） ion emissions within CdS microwires. The localized exciton magnetic polaxons （LEMPs） corresponding to the d-d optical transitions of Mn（Ⅱ） account for this shift. This LEMP emission from the double-, three- and four-Mn（Ⅱ） ions with ferromag- netic coupling after photoexeitation can happen in diluted magnetic semiconductors, except for the individual Mn（Ⅱ） doping. In addition, a simple spin-exchange polaronic model is established to account for these emission peaks well. Through this model, we can verify the local geometry of the Mn（Ⅱ） ions in CdS microwires.