Vacuum-Deposited Inorganic Perovskite Light-Emitting Diodes with External Quantum Efficiency Exceeding 10% via Composition and Crystallinity Manipulation of Emission Layer under High Vacuum
Hsieh CA, Tan GH, Chuang YT, Lin HC, Lai PT, Jan PE, Chen BH, Lu CH, Yang SD, Hsiao KY, Lu MY, Chen LY, Lin HW.
Adv Sci (Weinh). 2023 Feb 7:e2206076.
Researchers have significantly improved the efficiency of vacuum-deposited metal halide perovskite light-emitting diodes (PeLEDs) by optimizing the stoichiometric ratio of sublimed precursors and incorporating ultrathin layers. The properties of these perovskite layers are highly influenced by the presence of upper- and presublimed materials, which helps enhance device performance. By eliminating Pb° formation and passivating defects, the PeLEDs achieve an impressive external quantum efficiency (EQE) of 10.9% and up to 21.1% when integrating a light out-coupling structure.