Achieving White Circularly Polarized Luminescence via One-Pot Encapsulation of Dyes in Chiral MOFs

Developing robust materials that exhibit full-color, switchable, circularly polarized luminescence (CPL) remains a significant challenge. Herein, we report a facile, one-pot encapsulation of achiral dyes within chiral metal-organic frameworks (MOFs) for tunable CPL emission. This approach leverages the chiral microenvironment of MOFs to transfer chirality to the dye molecules, as evidenced by distinct mirror-image circular dichroism (CD) signals. Notably, the confinement effect not only imparts CPL activity to the guest molecules but also enhances their emission intensity via host-guest energy transfer. By controlling the encapsulation of dyes that emit blue (CBS), green (C6), and red (RB) light, we successfully achieved tunable CPL emission across the entire visible spectrum. Furthermore, optimizing the mass ratio of three trichromatic dyes yielded white-light CPL emission with a CIE 1931 coordinate of (0.30, 0.32) and a dissymmetry factor (g_lum) of |2 × 10^-3|.