The dependence of chain length of phenylalkylamine on the performance of perovskite light emitting diode

Abstract

Abstract The introduction of large organic ammonium (OA) cations into organolead halide perovskites (OHPs) has emerged as a promising strategy to improve the luminescence property of OHPs. Among the OA cations, phenylalkylamines with different chain length have been widely used to study the influence of chain length on the features of OHPs. Here, three large-group ammonium bromides (C6H5NH3Br, (ABr); C6H5CH2NH3Br, (BABr); and C6H5C2H4NH3Br, (PABr)) have been introduced to the MAPbBr3 precursor solution to form (OA)2(MA)n-1PbnBr3n+1 (OA = A, BA, PA; n = 2, 4, 6, 8) perovskite films. The morphology, crystal structure, and optoelectronic property of perovskite films are systematically studied. Furthermore, the perovskite light emitting diodes (PeLEDs) are fabricated based on different (OA)2(MA)n-1PbnBr3n+1 perovskite films, and the (BA)2(MA)3Pb4Br13 (n = 4) film shows the best device performance. Our results demonstrate the crucial balance between electroluminescent performance of PeLEDs and the chain length of phenylalkylamines, and provide important material designing concept on efficient PeLEDs.