The optical properties of Mn-Mg codoped epitaxial GaN were studied. Addition of Mg acceptors quenches the weak manganese-related photoluminescence (PL) band at 1.3 eV in GaN:Mn and a series of sharp PL peaks are observed at 1 eV in codoped epilayers. The change in PL spectra indicates that Mg addition stabilizes the Mn4+ charge state by decreasing the Fermi level. The 1 eV PL peaks are tentatively attributed to intra center transitions involving Mn4+ ions. Spin allowed 3d-shell 4T2-4T1 transitions and their phonon replicas are involved. The relative intensities of the sharp peaks are strongly dependent on the excitation wavelength, indicating the optically active Mn4+ centers involved in the separate peaks are different. The temperature dependence of the PL spectrum suggests the presence of at least three distinct Mn4+ complex centers.
@article{arxiv.cond-mat/0405097,
title = {Optical properties of Mn4+ ions in GaN:Mn codoped with Mg acceptors},
author = {B. Han and R. Y. Korotkov and B. W. Wessels and M. P. Ulmer},
journal= {arXiv preprint arXiv:cond-mat/0405097},
year = {2009}
}
Comments
14 pages, 3 figures, 1 table, accepted by Appl. Phys. Lett