Efficient single‑layer light‑emitting diodes based on organic–inorganic lead halide perovskite and tuning luminescence properties

Because of the interesting features of the organic/inorganic halide perovskite (e.g., ch_3nh_3pbx_3, x = cl, br) materials, such as long electron–hole diffusion length, high absorption coefficient and adjustable band gap, they have attracted a great deal of attention. in this research, ch_3nh_3pbx_3 (x = br, cl) are synthesized and perovskite-based single-layer and perovskite-based bilayer diodes are fabricated. using electron beam deposition technique, thin films of ch_3nh_3pbx_3 (x = br, 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 current–voltage 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.