Facile Preparation Strategy of Novel Carbon Dots with Aggregation‐Induced Emission and Room‐Temperature Phosphorescence Characteristics

Abstract As one of the most promising fluorescent nanomaterials, carbon dots (CDs) are extensively studied. Nevertheless, one‐pot synthesis methods for CDs with both dual emission aggregation‐induced emission (AIE) and room‐temperature phosphorescence (RTP) could lead to significant breakthrough in extensive application fields. Herein, a new class of CDs (E‐CCDs) with reversible luminescence (blue dissolved fluorescence and red AIE) and RTP behavior is obtained with an eco‐friendly, low‐cost one‐pot solvothermal method. E‐CCDs exhibit dual fluorescence emission at 460 (Em‐1) and 600 nm (Em‐2), which is related to different emission centers. The addition of cyanic acid enhances the RTP behavior with a lifetime of 1.17 s, which lasts for ≈9 s to the naked eye. Based on the unique fluorescence and phosphorescence characteristics of CDs, E‐CCDs can be potentially used for fingerprint detection and information encryption.