Replication Data for: Self-assembly of a robust hydrogen-bonded octylphosphonate network on cesium lead bromide perovskite nanocrystals for light-emitting diodes

In this work we employ a post-synthetic ligand exchange treatment with octylphosphonic acid to substitute the native oleic acid ligands on cesium lead bromide nanocrystals. Using solid-state NMR we proved that the introduced octylphosphonic acid ligands bound to the nanocrystal surface in a monodentate mode, also forming inter-ligand hydrogen bonds through their free P=O and P-OH groups. The binding of this ligand improved surface passivation, increasing post-purification PLQY to 62 %. As a result, we were able to fabricate light-emitting diodes with a maximum external quantum efficiency of 7.74 %.