Molecular design of two-dimensional perovskite cations for efficient energy cascade in perovskite light-emitting diodes

Despite extensive reports on highly efficient perovskite light-emitting diodes, rules governing the design of suitable two-dimensional (2D) templating cation to facilitate formation optimal emitter landscape for energy cascade remain largely elusive. With factors such as structure, size, functionalization, and charge capable influencing distribution multidimensional phases, importance 2D in determining film optoelectronic properties is indisputable. However, typical mono-functionalized cations often result larger lead halide octahedral spacing, which impedes effective transport. This has fueled investigation into use multiple domain improved transfer kinetics emitting species. In this study, we attempt impart enhanced characteristics resultant by employing two bi-functionalized aromatic cations, namely, pyridinium ethyl ammonium imidazolium ammonium, reminiscent phenyl a widely used cation. Although it proposed that greater intermolecular bonding would enhance rates, simultaneous increase distortion results quenching their corresponding luminescence properties, correlated with increased defect density within material. manifests form shorter PL decay lifetimes, lower PLQY, device performance arising from inferior funneling. study highlights designing offering better transport reduced development cascade-efficient, perovskites.