Enhancement of Radiative Processes in Solid-State Carbon Dots Using Tunable Plasmonic Nanopatch Antennas
Cheng-Wei, Liu1*, Tzu-Neng Lin1, Tz-Ting Tzeng1, Jyh-Shyang Wang1, Chi-Tsu Yuan1
1Department of Physics, Chung Yuan Christian University, Chung Li, Taiwan
* presenting author:Cheng-Wei Liu, email:william798424@gmail.com
Luminescent carbon dots (CDs) synthesized by a facile hydrothermal method have attracted much attention for a variety of applications in biophotonics due to their cheap, abundant and eco-friendly precursor materials. Unfortunately, the CDs in an aqueous solution typically exhibit low photoluminescence (PL) quantum yields as compared with that of cadmium-containing quantum dots. In particular, solid CDs suffer from strong concentration-induced PL self-quenching, thus hindering their further uses in light-emitting devices. To address this issue, most of the previous reports focused on the mitigation of the non-radiative (NR) relaxation rates by the modification of the surface states. Here, we want to directly enhance the radiative processes of solid CDs using plasmonic nanopatch antennas (PNAs) with broad resonant bands based on the Purcell effect. We expect that by coupling to PNAs, the radiative decay rates can be enhanced significantly while mitigating non-radiative Ohmic losses, leading to the enhanced quantum yields.

Keywords: Plasmonic Nanopatch Antennas, photoluminescence, carbon dots , Purcell effect