Spin-related emission properties have important applications in the future information technology; however, they involve microscopic ferromagnetic coupling, antiferromagnetic or ferrimagnetic coupling between transition metal ions and excitons, or d state coupling with phonons is not well understood in these diluted magnetic semiconductors (DMS). Fe 3+ doped ZnSe nanoribbons, as a DMS example, have been successfully prepared by a thermal evaporation method. Their power-dependent micro-photoluminescence (PL) spectra and temperature-dependent PL spectra of a single ZnSe:Fe nanoribbon have been obtained and demonstrated that alio-valence ion doping diminishes the exciton magnetic polaron (EMP) effect by introducing exceeded charges. The d-d transition emission peaks of Fe 3+ assigned to the 4 T 2 (G) → 6 A 1 (S) transition at 553 nm and 4 T 1 (G) → 6 A 1 (S) transition at 630 nm in the ZnSe lattice have been observed. The emission lifetimes and their temperature dependences have been obtained, which reflected different spin-phonon interactions. There exists a sharp decrease of PL lifetime at about 60 K, which hints at a magnetic phase transition. These spin-spin and spin-phonon interaction related PL phenomena are applicable in the future spin-related photonic nanodevices.

The influence of Mn doping on structural, optical, and magnetic behaviors of Mn-doped zinc stannate (ZTO) nanostructures was investigated. Pure and Mn (atomic ratios of 1, 3, and 5%)-doped high-quality Zn 2 SnO 4 nanowires were prepared through the chemical vapor deposition (CVD) technique. It was observed using X-ray diffraction (XRD) and Raman scattering that doped ZTO exhibits a cubic inverse spinel structure, and no peaks of ZnO, SnO, SnO 2 , and Mn oxides were found. Incorporation of the Mn ion into the ZTO lattice introduced partial antiferromagnetic coupled spins and related magnetism in the nanowires, which caused a clear band-edge luminescence blue shift as compared with the pure one, although the emission longer than 435 nm due to the presence of oxygen vacancies and traps in the lattice keeps minor changes. This blueshifted emission in the doped nanowire indicates the formation of an antiferromagnetic polaronic exciton, which is seldom identified in the doped semiconductor. This finding in Mn-doped ZTO samples will have some optical applications in the future.

We demonstrate the formation and excitation of exciton magnetic polarons (EMPs) and bound magnetic polarons (BMPs) in novel Co-doped GaN.