Dual emission N-doped carbon dot@benzotrithiophene tricarbaldehyde-terephthalic dihydrazide covalent organic framework

N-doped carbon dot (NCD)@COFBTT-Th nanosheets with strong dual-emission fluorescence are prepared by encapsulating NCDs into COFBTT-Th through amine-aldehyde dehydration condensation between benzotrithiophene tricarbaldehyde and terephthalic dihydrazide. The fluorescence of COFBTT-Th is enhanced because of fluorescence resonance energy transfer and the decrease of interlaminar accumulation and intramolecular rotation.