A new Dion–Jacobson-type perovskite with an isomorphic phase transition

Structural phase-transition materials have already received widespread attention due to their powerful functional features. However, for emerging Dion–Jacobson-type perovskites with strong intrinsic molecular interactions it is difficult to undergo structural phase transitions. Here, we synthesized a novel Dion–Jacobson (DJ) hybrid perovskite, ( R )-3-(dimethylamino)pyrrolidinium tetrabromidoplumbate(III), (C 6 H 16 N 2 )[PbBr 4 ] ( PPB ), by introducing a single chiral organic component. Experimental evidence reveals that PPB exhibits an isomorphic phase transition accompanied by a dielectric transition and a second-harmonic generation (SHG) response. This work presents a new phase-transition DJ hybrid perovskite functional material.