Metal-free ferroelectric halide perovskite exhibits visible photoluminescence correlated with local ferroelectricity.

The article looks at a report which found the metal-free ferroelectric perovskite MDABCO (N-methyl-N′-diazabicyclo[2.2.2]octonium)–ammonium triiodide exhibits coupled superior ferroelectricity and visible photoluminescence (PL). It mentions perovskite materials with tunable electronic and structural characteristics can realize various physical properties including electrical/ionic conduction, ferroelectricity, and luminescence.