Mechanochromic and Electroluminescence Properties of a Layered Hybrid Perovskite Belonging to the <110> Series

A layered hybrid perovskite belonging to the <110> series, (FA)(HEA)PbBr (HEA, hydroxyethylammonium; FA, formamidinium) exhibits a bright green narrow emission and a reversible mechanochromic luminescence effect: after grinding the powder a few seconds, the emission is blue shifted from 500 to 480 nm due to a partial amorphization. PeLEDs based on (FA)(HEA)PbBr as active material were also demonstrated, which is unprecedented for such a layered hybrid perovskite.