High-Performance Optical Stimuli-Responsive Circularly Polarized Luminescence Induced by Chiral CsPbBr₃ 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-CsPbBr₃ 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-CsPbBr₃@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-CsPbBr₃. The R/S-CsPbBr₃@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.

Keywords

chiral perovskite / circularly polarized luminescence / information encryption / light responsiveness / light-stimulated response / metal–organic frameworks

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