Bimodal luminescence behavior of spatially-ordered seven-stacked InAs/InAlGaAs quantum dots

► Single layer and 7-stacked layers of InAs quantum dots (QDs) were grown on InP. ► Temperature-dependent photoluminescence (PL) and time-resolved PL were carried out. ► Two peaks of 7-stacked QDs are attributed to the bimodal size distributions of QDs. ► Single and 7-stacks of QDs show different luminescence properties with temperature.