Origin of blue-band emission from Mg-doped Al 0.15 Ga 0.85 N/GaN superlattices
Journal
Applied Physics Letters
Journal Volume
88
Journal Issue
8
Date Issued
2006
Author(s)
Abstract
Investigation on the origin of blue luminescence from Mg-doped AlGaN?GaN superlattices is presented. The edge emission of the blue band shows an optical anisotropy with a line symmetry along the c axis as probed by the polarized luminescence. The blue band inherently exhibits a metastable behavior as demonstrated by the dc and ac photoluminescence measurements and the metastable behavior can be enhanced by thermal treatment. Our results establish that the underlying microstructure responsible for the blue luminescence in Mg-doped AlGaN?GaN SLs arises from the transitions involved in the threading structures decorated with Mg impurities/or other defects.
Type
journal article