Chiral Quasi‐2D Perovskites Based Single Junction Spin‐Light‐Emitting Diodes

Abstract Low temperature solution‐processible chiral metal halide perovskites, which posse the innately chiral‐induced spin orbit coupling (CISOC), are valuable for the realization of room temperature single junctions‐based spin‐light‐emitting diodes (spin‐LEDs), without involving integrated optics and ferromagnetic electrodes. The current challenging primarily lies on the development of high‐performance spin‐LEDs and the demonstration of the chiral‐induced spin selectivity (CISS). Herein, chiral organic cation based quasi‐2D perovskite films with prominently circularly polarized luminescence and bright emissions are fabricated for the application of room‐temperature spin‐LEDs. A remarkable external quantum efficiency (EQE) of 15.42% and circularly polarized electroluminescence (CP‐EL) of 4.98% are well achieved in ambient condition. With studies of spin‐related exciton states and magneto‐photoluminescence (magneto‐PL), the spin‐lifetime (τ s ) is estimated to be 20 ps. This work has greatly promoted the present growth for the high‐performance chiral perovskites spin‐LEDs.