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Visible luminescence has been obtained from ensembles of defect‐free, In_xAl_(1−x)As islands of ultrasmall dimensions embedded in Al_yGa_(1−y)As cladding layers. These structures were grown by molecular beam epitaxy and studied with low‐temperature photoluminescence (PL) and transmission electron microscopy. Visible luminescence is produced using various compositions of In_xAl_(1−x)As/Al_yGa_(1−y)As. Quantum dot size distributions, planar densities, dot heights, and wetting layer thicknesses are presented and correlated with the PL spectra.