Zeeman splitting and dynamics of an isoelectronic bound exciton near the band edge of ZnO

Abstract

Comprehensive time-resolved photoluminescence and magneto-optical measurements are performed on a bound exciton (BX) line peaking at 3.3621 eV (labeled as ${I}^{*}$). Though the energy position of ${I}^{*}$ lies within the same energy range as that for donor bound exciton (DX) transitions, its behavior in an applied magnetic field is found to be distinctly different from that observed for DXs bound to either ionized or neutral donors. An exciton bound to an isoelectronic center with a hole-attractive local potential is shown to provide a satisfactory model that can account for all experimental results of the ${I}^{*}$ transition.