Ultra‐Broadband Photoluminescent Carbon Dots Synthesized by Laser‐Induced Thermal Shock

Abstract

Carbon dots (CDs) emerge as a novel type of fluorescent materials with a good photostability, biocompatibility, and high quantum yield. They become a promising alternative to conventional fluorescent materials such as rare‐earth phosphors and semiconductor quantum dots owing to their ease of synthesis and fabrication from ready‐available compounds. Near‐infrared (NIR) CDs are of high demand for in vivo studies owing to little photoinduced damage to surrounding tissues, deep penetration of radiation into tissue, and low autofluorescence. A laser‐assisted synthesis approach is demonstrated, which allows NIR‐emitting CDs to be obtained. By rapidly heating the precursors (4,4’‐bis(diethylamino)benzophenone in sol–gel matrix) with femtosecond pulses, NIR emitting CDs can be obtained with the emission in the ranges of 800–1000 and 1100–1600 nm of the resulting CDs.

Carbon Dots for Electroluminescent Light‐Emitting Diodes: Recent Progress and Future Prospects

“…The successful utilization of CDs based on RTP and DF in improving the device performance of electroluminescent LEDs has also been demonstrated recently. [ 143–145 ]…”

“…The successful utilization of CDs based on RTP and DF in improving the device performance of electroluminescent LEDs has also been demonstrated recently. [143][144][145] However, research on CDs with RTP and DF is still at its early stage, and conclusive evidence and convincing explanations are still absent for identifying the relationship between the luminescence mechanisms and structure of CDs. Although different explanations of the triplet-related emission of CDs have been reported, such as surface state, quantum confinement, and molecular state, it is difficult to clearly distinguish these influence factors from each other.…”