Effects of Amino Compounds and Zeolite Matrix on the Afterglow Performance of Carbon Dots@Zeolite Composites

Abstract At present, the regulation mechanism of the number and type of amino groups in the precursor and the number of alkyl chains in amine compounds on afterglow performance is not clear. To address this problem, a series of amine compounds as carbon sources is designed and utilized AlPO‐5 zeolite as the matrix to create a range of carbon dots@zeolite composite materials (CDs@AlPO‐5). N heteroatoms not only increase the potential for triplet emission but also introduce more N/O (C═O/C═N/N─H bonds) into the system as the number of amino groups increases. The introduction of abundant active groups and the strong interaction between carbon dots (CDs) and molecular sieve matrix induces a red shift in the afterglow emission wavelength and an increase in lifetime. The quantum yields (QYs) of CDs@AlPO‐5 are affected by the type of amino groups and the number of alkyl chains in the carbon source. The higher activity of the amino reaction site and the reduction in the number of alkyl chains help to regulate the afterglow emission behavior. Intelligent selection of the type and number of amino groups is an important step toward broadening the basis for controllable preparation of highly efficient afterglow materials based on CDs.