The local structure of Mn2+-doped Cs2(Na1-xAgx)InCl6 compounds.

The aim of the proposal is to carry out pair distribution function (PDF), XANES and EXAFS analyses on Mn-doped halide double perovskites (HDPs), in form of bulk and nanocrystals, characterised by persistent luminescent (PeL). Remarkably, PeL disappears at room temperature (RT) moving from bulk to nano-structured samples in Mn2+doped Cs2(Na1-xAgx)InCl6 compounds. The origin of this behaviour has not yet been explained and our proposal aims to shed light on this phenomenon. The PeL is due to traps, that could be local structure defects. So, an in-depth characterization of the local structural properties by EXAFS and PDF is required to reveal how the structural defects change from bulk to nano, impacting PeL. Moreover, given that PeL is influenced by temperature, XAS could give us meaningful information at low and high temperature. Adding this info to our existing knowledge will enable us to achieve PeL in nano halide perovskites, with greater applicability.