Optical properties of /spl delta/-doped GaAs nipi super-lattices

A /spl delta/-doped GaAs nipi super-lattice has been examined using photoluminescence spectroscopy. Intensity dependent photoluminescence spectra were measured over 5 orders of magnitude (1 kW/cm/sup 2/-8 mW/cm/sup 2/). A significant shift in the photoluminescence emission maxima (155 meV) was evident over this range. Time resolved photoluminescence spectra were observable over 6 temporal orders of magnitude (10 ns-10 ms). The strong photoluminescence signal over such a long decay time allowed the relaxation of the nipi effective bandgap after optical excitation to be observed.