Non‐Covalent Iron‐Armored Chain Horse: A Strategy Leading to Highly Efficient Deep‐Blue Room Temperature Phosphorescence

Abstract The iron‐armored chain horse is a military strategy in ancient China to enhance the combat force of the entire army, especially when individual fighters are vulnerable to being picked off one by one. Herein, this strategy is adopted to generate highly efficient metal‐free blue room temperature phosphorescence (RTP) using the world's largest production of dicarboxylate acid. By encapsulating the commercially available chemical disodium terephthalate (DTPA) within the iron armor of α‐cyclodextrin (α‐CD), and subsequently linking the iron‐armored DTPA@α‐CD horses into a crystalline array mediated by hydrogen bonds and Na⁺ coordination, a highly confined and segregated arrangement of DTPA is achieved, leading to heavy atom‐free deep‐blue phosphorescence with a maximum efficiency of 83.3%. Since the crystalline array of the iron‐armored chain horse DTPA@α‐CD can be facilely obtained through water evaporation, the current phosphorescent material allows for rapid, high‐throughput solution processing of deep‐blue afterglow display, offering an economic and environmentally benign approach for deep‐blue RTP materials and facilitating their application.