Full‐Spectrum Carbon Dots Electroluminescent White Light‐Emitting Diodes with a Record Color Rendering Index of 94

Abstract

Abstract Carbon dots (CDs) are emerging as promising nanomaterials for next‐generation white electroluminescent devices due to their high photoluminescence quantum yield (PLQY), broad emission spectrum, and compatibility with solution‐processed methods. However, current CD‐based white light‐emitting diodes (CDs‐WLEDs) heavily rely on costly commercial host materials and struggle with low color rendering index (CRI). Herein, a “dual‐phase CDs emitter” strategy is introduced to achieve full‐spectrum white light emission, without employing commercial host materials. As a proof of concept, CDs are synthesized with broadband green emission and nearly 100% PLQY. Spectroscopic and structural analyses confirm that their luminescence originates from molecular state emission. By combining these green CDs with carbon quantum dot organic frameworks capable of dual blue and red emissions, white light is successfully produced with a record CRI of 94 and color coordinates of (0.32, 0.34). This approach provides a cost‐effective and efficient pathway for developing high‐performance WLEDs that rely exclusively on CDs.