Core-Shell Perovskite Quantum Dots for Highly Selective Room-Temperature Spin Light-Emitting Diodes.

Circularly polarized light (CPL) is a crucial light source with a wide variety of potential applications such as magnetic recording, and three-dimensional display. In this study, we develop core-shell heterostructured perovskite quantum dots (QDs) for room-temperature spin-polarized light-emitting diode (spin-LEDs). Specifically, a 2D chiral perovskite shell is deposited onto the achiral 3D inorganic perovskite (CsPbBr 3 ) core. Owing to the chiral-induced spin selectivity effect, the spin state of the injected charge carriers is biased when they are transmitted through the 2D chiral shell. The spin-controlled carriers then radiatively recombine inside the CsPbBr 3 emissive core, resulting in CPL emission. We demonstrate that the (R)- and (S)-1-(2-(naphthyl)ethylamine) (R-/S-NEA) 2D chiral cations enhance the spin polarization degree due to their strong chiroptical properties. Systematical defect analyses confirmed that 2D chiral cations (i.e., R-/S-NEA) successfully passivate halide vacancies at the surface of the CsPbBr 3 QDs, thereby attaining a high photoluminescence quantum yield of 78%. Moreover, the spin-LEDs prepared with core-shell QDs achieve a maximum external quantum efficiency of 5.47% and circularly polarized electroluminescence with a polarization degree (P CP-EL ) of 12% at room temperature. Finally, various patterns fabricated by inkjet printing the core-shell QDs emitted strong CPL, highlighting their potential as an emitter for next-generation displays. This article is protected by copyright. All rights reserved.