Amplifying the Circularly Polarized Luminescence of CsPbBr3 Nanocrystals by Chiral Metal–Organic Frameworks: In-Situ Growth, Chiral Assemble, and Chirality Transfer

Halide perovskites have risen as promising circularly polarized luminescent (CPL) materials for applications in 3D displays, optical anti-counterfeiting, and information storage. And yet, achieving highly anisotropic CPL emission from achiral halide perovskites remains fraught with challenges. Herein, the helical channels of chiral MOFs (L/D-MOFs) are utilized as chiral templates for the in-situ growth of CsPbBr 3 perovskite nanocrystals (NCs), generating CPL-active CsPbBr 3 @L/D-MOFs materials with high luminescence dissymmetry factors (|g lum |, 8.39×10 −3 ) and high photoluminescence quantum yields (QY, 78%). Synchrotron-radiation-based X-ray absorption spectroscopy clearly verifies that the embedded CsPbBr 3 NCs inherit the helicity of L/D-MOFs through strong Cd─Br coordination bonds, thereby facilitating chirality transfer from L/D-MOFs to CsPbBr 3 NCs. Additionally, the efficient Förster resonance energy transfer (FRET) from chiral L/D-MOFs to CsPbBr 3 NCs further amplifies the CPL signal of CsPbBr 3 NCs. Benefiting from the excellent CPL properties and tunable emission, the CsPbX 3 @L/D-MOFs demonstrate great potential in CPL-LEDs. This work proposes a viable strategy for the rational design of high-performance CPL-active perovskite materials and offers profound insights into the chirality transfer mechanism.