Quasi-2D lead-free halide perovskite using superalkali cations for red-light-emitting diodes

We obtained the quasi-2D [C 6 H 5 (CH 2 ) 2 NH 3 ] 2 H 5 O 2 Sn 2 Br 7 perovskite with stable dynamics performance, excellent electronic structure, suitable exciton binding energy and direct band gap, suggesting that the quasi-2D perovskite can be used in the red-light-emitting diodes.