Reduced-dimensional perovskites with dithioketal-containing intercalating cations for near-infrared light-emitting diodes

Abstract

Reduced-dimensional (RD) metal halide perovskites (MHPs) have received much attention from scientific researchers for their highly tunable optoelectronic properties and solution processability. To date, the large cation candidates for constructing RD MHPs have mostly been selected from the organoamine/organoammonium salt family which is commercially available. We previously reported a straightforward approach for preparing new types of RD perovskites based on the organothiol redox or condensation reactions on the organic cations (Yuan et al., CCS Chem., 2022, 3, 1276–1284). Here, we further apply the synthetic strategy to prepare two new series of Dion–Jacobson (DJ) type RD MHPs with dithioketal-containing intercalating cations. The single-crystal X-ray crystallography and spectroscopic results indicate the evolution of the distortion of the RD structures and the photophysical behaviors following the increase in the inorganic components. The materials are solution processable for near-infrared light-emitting diode application, and the best device emitting at 746 nm achieved an EQE of 2%.