Blue luminescent N,S-doped carbon dots encapsulated in red emissive Eu-MOF to form dually emissive composite for reversible anti-counterfeit ink

By suitable combination a Eu-MOF and its dual-emission fluorescence composite N,S-CDs@Eu-MOF, a visible fluorescent probe for detecting water content in organic solvents and a reversible anti-counterfeit ink were established.