Recent advances in red-emissive carbon dots and their biomedical applications

Abstract

This review mainly summarizes the research advances in synthetic strategies, optical properties, and biomedical applications of red-emissive carbon dots in recent years.

One-step synthesis of orange–red emissive carbon dots: photophysical insight into their excitation wavelength-independent and dependent luminescence

“…6–8 Thus, CDs with high photoluminescence (PL) quantum yield ( Φ f ) and emitting near-infrared regions with orange or red fluorescence are mostly required. 8–10…”

Nitrogen-Doped Carbon Quantum Dots with Photoactivation Properties for Ultraviolet Ray Detection

“…The converse-photobleaching behavior not only effectively addresses the issue of photobleaching but also promotes the potential applications in bioimaging and photodetector devices. , The concept of fluorescence enhancement resulting from light irradiation, known as “photoactivation”, was first reported in quantum dots (QDs) in 2000, with subsequent studies yielding significant results. − However, the phenomenon of luminescence enhancement in photoresponsive carbon quantum dots (CQDs) remains relatively unexplored . As a new category of nanomaterials, CQDs possess a variety of exceptional properties, such as facile preparation and purification, superior water solubility, multicolored fluorescence, tunable optical properties, and minimal cytotoxicity. − These attributes have found extensive utilization in fields like photoelectronic devices, sensing, photocatalysis, and bioimaging. , Currently, the primary challenges hindering the widespread application of CQDs include their low fluorescence quantum yield (QY) and susceptibility to photobleaching when subjected to continuous light exposure. − Therefore, the exploration of new photobrightening CQDs with anti-photobleaching property and enhanced photoluminescence holds considerable promise for advancing their potential applications.…”