Dear Pegah Bagheri, do check the pdf file i have attached
also you can find more in the articles
Three Colors Emission from S,N Co-doped Graphene Quantum Dots for Visible Light H2 Production and Bioimaging. DOI: 10.1002/adom.201400549
N, S co-doped graphene quantum dots from a single source precursor used for photodynamic cancer therapy under two-photon excitation. DOI: 10.1039/b000000x
minFluorescence Carbon Nanoparticles Derived from Natural Material of Mango Fruit for Bio-imaging Probes. DOI: 10.1039/C4NR04805A
Quantum-Sized Carbon Dots for Bright and Colorful Photoluminescence. DOI:10.1021/ja062677d