states induced by defects as well as a more pronounced distortion related by the presence of Ge in comparison to 2D Pb-based perovskites. The progressive decrease of PL intensity from DA2GeI4 to DA2GeBr4 well correlates to the lifetimes trend (τ) (Figure ) which span from τ = 1.6 to τ  0.2 ns along with the increase of bromide content in the solid solution.