Photo‐Curable 3D Printing of Circularly Polarized Afterglow Metal–Organic Framework Monoliths

Abstract

AbstractDeveloping coordination complexes (such as metal–organic frameworks, MOFs) with circularly polarized luminescence (CPL) is currently attracting tremendous attention and remains a significant challenge in achieving MOF with circularly polarized afterglow. Herein, MOFs‐based circularly polarized afterglow is first reported by combining the chiral induction approach and tuning the afterglow times by using the auxiliary ligands regulation strategy. The obtained chiral R/S‐ZnIDC, R/S‐ZnIDC(bpy), and R/S‐ZnIDC(bpe)(IDC = 1H‐Imidazole‐4,5‐dicarboxylate, bpy = 4,4′‐Bipyridine, bpe = trans‐1,2‐Bis(4‐pyridyl) ethylene) containing a similar structure unit display different afterglow times with 3, 1, and <0.1 s respectively which attribute to that the longer auxiliary ligand hinders the energy transfer through the hydrogen bonding. The obtained chiral complexes reveal a strong chiral signal, obvious photoluminescence afterglow feature, and strong CPL performance (glum up to 3.7 × 10−2). Furthermore, the photo‐curing 3D printing method is first proposed to prepare various chiral MOFs based monoliths from 2D patterns to 3D scaffolds for anti‐counterfeiting and information encryption applications. This work not only develops chiral complexes monoliths by photo‐curing 3D printing technique but opens a new strategy to achieve tunable CPL afterglow in optical applications.