Stable Room-Temperature Phosphorescence from MXene-Derived Carbon Dots: Ultralong Afterglow Emission without an External Matrix


Herein, we synthesized highly defined carbon dots (CDs) from two-dimensional delaminated MXene through a solution-based acid etching method. The as-synthesized CDs show blue fluorescence emission in the solution phase upon neutralization with excess alkali. However, after solidification, the solid powder of CDs shows strong bright green room-temperature phosphorescence/afterglow emission for up to 5 s without using any further external matrix. The fundamental photophysical properties of the CDs are further correlated with the structural and elemental features. It suggests that the rigidity of the surface emissive states due to the slow modification of the exterior surface of CDs facilitates the afterglow emission. Temperature-dependent photoluminescence study and the systematic interconversion between room-temperature phosphorescence and prompt fluorescence depict the possible thermally activated delayed fluorescence at high temperatures. It is further correlated with the low-temperature phosphorescence studies (up to 90 K). The solid powder of CDs has been further utilized directly as a sustainable smart material for anticounterfeiting and information protection applications

    Similar works

    Full text


    Available Versions