A ligand strategy retarding monovalent copper oxidation toward achieving Cs 3 Cu 2 I 5 perovskite emitters with enhanced stability for lighting

A novel organic ligand (ethylenediaminetetraacetic acid, EDTA) was proposed to improve the stability of Cs 3 Cu 2 I 5 , which can inhibit the oxidation of Cu + in Cs 3 Cu 2 I 5 . The air-, photo- and thermal stability of EDTA-Cs 3 Cu 2 I 5 powder was greatly improved.