Printed m Great Britain (l(13X-Illt)X(t)4lilllft)9.7 (XI3X-1119X/t)4 $7.1X1+.11~} A NOTE ON THE PHOTOLUMINESCENCE DECAY OF THERMALIZED EXCITONS IN QUANTUM STRUCTURES: MANY-BAND MODEL

The temperature dependence of the photolumJnescence decay time associated with the radiative decay of a thermalized exciton population in a quantum well or wire is shown to be independent of the number of exciton bands involved. Keyword=: A. Quantum Wells, D. Optics] Properties, E. Luminescence, E. Time-Resolved Optics] Spectroscopies Time-resolved photolnmlnescence (TRPL) spectro-scopy with off-resonant excitation provides a probe into the radiative lifetimes of excitons in d-dimenslons] emi-conductor heterostructures, such as quantum wells (QW) (d = 2) and quantum wires (QWR) (d = 1). It was realized quite early by Fddmtma, et a~l]. that the TRPL decay time has a temperature (T) dependence r(T) which also depend = on d. For QW's, the assump-tion of a thermal distribution of excitons occupying a single parabolic band together with the requirement tha