Resonant excitation of infrared emission in GaN:(Mn,Mg)

By combining experimental photoluminescence excitation spectroscopy and calculations based on density functional theory and many-body Green's functions, the most efficient excitation channels of infrared (IR) emission from Mn-Mg-k paramagnetic complexes stabilized in GaN:(Mn,Mg) are here identified. Moreover, a Tanabe-Sugano energy diagram for 3d(2)Mn(5+) is reconstructed and Mn-Mg-3 are singled out as the predominant configurations responsible for the IR emission. The correlation of intensity of the individual emission lines as a function of temperature and excitation energy allows assigning them to well-defined and specific optical transitions.