Picosecond photoluminescence from bound excitons in Cd 1−xZn xTe

Abstract

Picosecond lifetimes of donor- and acceptor-bound excitons (( D 0, X) and ( A 0, X)) in Cd 0.55Zn 0.45Te have been observed by time correlated single photon counting with high spectral resolution. The lifetimes increase with localized energy as expected for radiative transitions and are predicted reasonably well by both the Sanders-Chang and Rashba-Gurgenishvili theories. Lifetimes measured at the main photoluminescence peak for three other Cd 1− x Zn x Te samples with x = 0, 0.023 and 0.19 decrease with increasing x.