Constructing White Fluorescence Supramolecular‐Carbon Dots Hybrids with Room Temperature Phosphorescence for Efficient Light‐Emitting Diodes

White light‐emitting diodes are gaining interest for next‐generation lighting and displays due to their energy efficiency and wide applications. Conventional methods primarily combine a blue light‐emitting diodes chip with a yellow emitter, or use an ultraviolet chip with red, green, and blue or white emitters. However, short exciton lifetime of light‐emitting diodes has challenge in realizing energy‐saving lamp and emergency lighting. Herein, an efficient supramolecular‐carbon dots hybrid strategy to achieve efficient white emission with long‐exciton lifetime is proposed. The 1,3,5‐benzenetricarboxylic acid and cyanuric acid is employed as a blue‐emitting molecular self‐assembled room‐temperature phosphorescence material, combined with highly efficient N, O‐doped orange carbon dots to construct a hybrid phosphorescent system. As expected, a cold white‐light emission with Commission Internationale d’Éclairage coordinates of (0.29, 0.34), a correlated color temperature of 7727 K, and a color rendering index of 84 is gained. The prepared light‐emitting diodes exhibited distinct afterglow emission even after the power is turned off. The supramolecular‐carbon dots hybrid design establishes a new paradigm for high‐performance white light‐emitting diodes, advanced anti‐counterfeiting, and green materials. As a groundbreaking alternative to traditional rare‐earth, organic dye, and quantum dot systems, it charts the course for intelligent and sustainable development in advanced materials science.