Abstract
As an emerging class of luminescent materials, Carbon dots (CDs) have attracted tremendous attention in the metal-free room temperature phosphorescence (RTP) material, but the methods to enhance the emission intensity and prolonging the lifetime of RTP CDs were seldom reported. Herein, we developed a method to improve the emission intensity and increase the lifetime of green RTP CDs. The RTP lifetime of CDs has been extended about 12-fold (from 45 to 550 ms) through introducing polymer and the secondary modification of urea realized by means of heat treatment. Moreover, the emission intensity of RTP CDs has been increased about 20 times. It has been found that the improvement of RTP lifetime and emission intensity is benefited from the decreasing vibration and rotation of the excited triplet species, thus suppressing the non-radiative transitions. Furthermore, the prepared CDs with strong RTP both exhibit great potential in light-emitting diodes and anti-counterfeiting application.
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