Full-color circularly polarized luminescence from perovskite quantum dots embedded within Chiral ZIF-8 matrix

Abstract

The exploration of circularly polarized luminescence (CPL) materials based on perovskite quantum dots (PeQDs) has garnered significant interest across various disciplines owing to their extensive potential in optical applications. However, conventional perovskite-based CPL materials frequently encounter formidable challenges, including complex fabrication processes, limited emission bandwidths, inevitable anion exchange, and aggregation-induced quenching. To address these challenges, we proposed a unique approach to develop solid-state CPL nanohybrids with superior full-color CPL by integrating CsPbX₃ (X = Cl, Br, I) PeQDs into amino acid co-assembled chiral metal-organic frameworks (CMOFs). By in situ generating PeQDs within L/D-ZIF-8 CMOFs, we achieved solid-state CPL nanohybrids (L/D-ZIF-8⊃PeQDs) that exhibited enhanced CPL properties and stability. The chiral microenvironment provided by the CMOFs not only boosts CPL performance but also effectively mitigates issues such as anion exchange and aggregation-induced quenching. More intriguingly, such nanohybrids displayed tunable CPL emissions across the entire visible spectrum, achieving a maximum dissymmetry factor (g_lum) value of 1.41 × 10⁻³ and a photoluminescence quantum yield of up to 13 %. Furthermore, we showcased their proof-of-concept application by fabricating circularly polarized red-green-blue and white light-emitting diodes with an impressive color gamut exceeding 137 % NTSC, thereby unveiling the significance of our approach in promoting CPL functionalities of perovskite-based materials.