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

A layered hybrid perovskite belonging to the series, (FA)(2)(HEA)(2)Pb2Br8 (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)(2)(HEA)(2)Pb2Br8 as active material were also demonstrated, which is unprecedented for such a layered hybrid perovskite.