▎ 摘　　要

The present study portrays the synthesis, characterization and different biological applications of hetero atoms (N and S) doped smart graphene quantum dots (NS-GQD). NS-GQD has been fruitfully conjugated with commercially available antibiotic streptomycin to develop drug conjugated quantum dot (DCQ) for the improvement of drug efficacy. Furthermore the smartness of NS-GQD has also been investigated in terms of intracellular imaging and biocompatibility study. Different spectroscopic and microscopic analyses reveal the successful development of NS-GQD and DCQ. Therefore these findings demonstrate some astonishing capabilities of NS-GQD towards different real field applications.