Fig. 3: Properties of alkali metals doped PeQW arrays.

a XRD patterns, b Normalized photoluminescence spectra (\({\lambda }_{{ex}}=350{nm}\)), c TRPL decay curves and d PLQYs (\({\lambda }_{{ex}}=365{nm}\)) measured at corresponding photoluminescence peak of as-synthesized alkali metals doped PeQWs. e Environmental photoluminescence stability under ambient condition for alkali metal doped PeQWs.