Photoluminescent Properties Of Carbon Nanodots

With unique and tunable photoluminescent properties, carbon nanodots (CNDs), as a new class of optical tags, have been extensively studied. In this chapter, we introduce the basic knowledge with respect to CNDs, including their structures and compositions, optical properties and applications in the bioimaging and biosensors. In particular, the photoluminescence (PL) mechanisms of CNDs, which are able to instructively improve its optical properties, have been emphasized and discussed in details. We hope to inspire research into the origins of the unique properties of CNDs and intrigue the researchers with different research backgrounds to participate in this field and explore the PL mechanisms of CNDs.