High‐Performance Color‐Tunable Perovskite Light Emitting Devices through Structural Modulation from Bulk to Layered Film

Abstract

Adding 2-phenoxyethylamine (POEA) into a CH₃ NH₃ PbBr₃ precursor solution can modulate the organic-inorganic hybrid perovskite structure from bulk to layered, with a photoluminescence and electroluminescence shift from green to blue. Meanwhile, POEA can passivate the CH₃ NH₃ PbBr₃ surface and help to obtain a pure CH₃ NH₃ PbBr₃ phase, leading to an improvement of the external quantum efficiency to nearly 3% in CH₃ NH₃ PbBr₃ LED.