Amino Acid Simulated Host–Guest Systems With Full‐Color High‐Temperature Organic Afterglow

Materials capable of retaining persistent luminescence at high temperatures have attracted extensive attention in recent years. However, because excited‐state excitons involved in radiative transitions are easily quenched at elevated temperatures, achieving efficient afterglow emission under high thermal conditions remains a significant challenge. To address this issue, stimulated by the special structure of amino acid, we introduce the strong interactions, amino–carboxylic acid type hydrogen‐bonding, into a host‐guest doped materials. By doping the guest molecule containing amino groups into the carboxyl‐rich host of butane‐1,2,3,4‐tetracarboxylic acid (denoted as host D), full‐color afterglow emission from blue to red is realized at temperatures above 430 K. Because the four carboxyl groups of host D form a highly dense and stable hydrogen‐bonded network in the solid state, the doped materials maintain their high‐temperature afterglow performance in various non‐hydrogen‐bond‐donating solvents. Benefiting from the full‐color persistent emission and temperature‐dependent afterglow lifetimes, the materials further enable multidimensional information encryption and transparent liquid flow direction marker applications. The design strategy and results provide useful insights for developing high‐temperature phosphorescent materials and highlight their broad potential across diverse platforms.