High‐Performance Optical Stimuli‐Responsive Circularly Polarized Luminescence Induced by Chiral CsPbBr ₃ Nanoparticles in Achiral MOFs

ABSTRACT Stimuli‐responsive circularly polarized luminescence (CPL) materials have received extensive attention in the field of information encryption and anti‐counterfeiting due to their ability to intelligently respond to external stimuli, enabling dynamic modulation of CPL properties. In this work, chiral luminescent R/S‐CsPbBr 3 nanoparticles (NPs) are employed to induce CPL in achiral host lanthanide metal–organic frameworks (Ln‐MOFs), thereby achieving the high‐performance optical stimuli‐responsive CPL. This synthetic strategy demonstrates considerable universality and significantly expands the CPL spectral coverage through rational modulation of Ln‐MOFs. The resulting R/S‐CsPbBr 3 @Eu‐MOF composite materials exhibit excellent CPL performance with a luminescence dissymmetry factor ( g lum ) as high as 1.3 × 10 −2 , attributed to synergistic energy/charge transfer processes mediated by π–π stacking interactions between the host Eu‐MOFs and guest R/S‐CsPbBr 3 . The R/S‐CsPbBr 3 @Ln‐MOF composite materials feature two distinct chiral emission centers, allowing wavelength‐programmable CPL emission under different excitation wavelengths. This property holds significant potential for applications in multilevel information encryption and anti‐counterfeiting.