Dimensionality-Mixed Phases Facilitate Chirality Transfer and Spin-Orbit Coupling for Chiral Perovskite Red Spin-LEDs.

Chiral hybrid perovskite spin-light emitting diodes (spin-LEDs) adopt spin filtration technology based on chirality-induced spin selectivity (CISS), while circularly polarized electroluminescence (CP-EL) arises from a direct conversion of spin angular momentum into light. The current obstacle lies in elevating the dissymmetry factors for circularly polarized luminescence in quasi-2D chiral-achiral synergistic systems. Herein, chiral organic ligands R-/S-methylbenzylamine (R-/S-MBA) were incorporated into lead-iodide octahedral inorganic frameworks, forming dimensional-mixing phases. An effective chirality transfer through the visible light region and chirality-induced spin-orbit coupling (CISOC) strengths of up to 0.8081 eV·Å were achieved for ultrathin red emitters. Without spin injection, prominent dissymmetry factors of CP-EL approaching 20% were obtained for R-/S-MBA-based bright red single-junction spin-LEDs. Our work greatly promotes the development high-performance red chiral perovskite spin-LEDs.