Non‐Classical Hydrogen Bond Based Efficient Solid‐State Organic Emitters Enabled by a Synergistic Anion and Mechanical Bond Effect

Abstract

Traditional fluorophores often face aggregation‐caused quenching (ACQ), limiting their efficacy in high‐concentration applications. We demonstrate that a combined effect of anion and mechanical bond can significantly increase fluorescence intensity, up to 14‐fold and a quantum yield of 97.0%. A large number of crystal analysis reveal that this enhancement is primarily driven by non‐classical hydrogen bonds, which stabilizes the structure and restricts molecular motion. The versatility of this synergistic effect opens new avenues for applications, including circularly polarized luminescence (CPL) facilitated by chiral anions, and the development of a novel fluorescence switchable rotaxane shuttle that operates without charge transfer.