Tunable emission in ferromagnetic CdS:Dy3+ nanostructures for optoelectronic and spintronic applications

The incorporation of 3d magnetic ions into intrinsic semiconductors is one of the sophisticated way to tune their opto-magnetic behavior but dire need is to determine the functional changes resulting from doped-ions. Here, dysprosium (Dy) ions have been doped into CdS nanostructures via co-precipitation technique and studied their influence in optical and magnetic properties. The PL of doped-nanostructures exhibited violet, blue (454.5 nm) and orange emissions, simultaneously. The violet emissions correspond to the band edge (BE) emission of CdS and blue emissions appeared due to the f-f transition from Dy4+ to Dy3+ and Dy3+. Burstein-Moss-Effect explains the increased band-gap observed in the doped samples. VSM studies show the formation of ferromagnetism in a diamagnetic CdS nanostructure due to the successful incorporation of Dy3+ ions into CdS which can play a significant role in tuning their optical and magnetic properties for potential applications in optical devices and spintronics.