Efficient single-layer light-emitting diodes based on organicâinorganic lead halide perovskite and tuning luminescence properties

Abstract

AbstractBecause of the interesting features of the organic/inorganic halide perovskite (e.g., CH3NH3PbX3, Xâ=âCl, Br) materials, such as long electronâhole diffusion length, high absorption coefficient and adjustable band gap, they have attracted a great deal of attention. In this research, CH3NH3PbX3 (Xâ=âBr, Cl) are synthesized and perovskite-based single-layer and perovskite-based bilayer diodes are fabricated. Using electron beam deposition technique, thin films of CH3NH3PbX3 (Xâ=âBr, Cl) hybrids with excellent homogeneity are manufactured. Absorption spectrum, X-ray spectrum and photoluminescence spectrum of organic/inorganic halide perovskites along with electroluminescence spectra, SEM micrographs and currentâvoltage characteristic of perovskite-based light-emitting diodes are investigated. Perovskite-based bilayer diodes are evaluated for the first time. The difference between the emission wavelengths of single-layer and bilayer diodes is the main characteristic of bilayer diodes.