Distance-Dependent Nonradiative Energy Transfer from InGaN Quantum Wells to Carbon Nanodots via Optical Waveguiding
Tzu-Neng Lin1*, Chiao-Hsin Chang2, Ji-Lin Shen1
1Department of Physics, Chung Yuan Christian University, Chung-Li, Taiwan
2Master Program in Nanotechnology, Chung Yuan Christian University, Chung-Li, Taiwan
* presenting author:Tzu-Neng Lin, email:g9762009@gmail.com
Fluorescent carbon nanodots (CNDs) have attracted great interest in the past decade due its advantages, such as low photobleaching, chemical stability, excellent biocompatibility, low toxicity, and good surface grafting, enabling them to be the next-generation luminescent nanomaterials. Here, we demonstrate efficient nonradiative energy transfer from InGaN quantum wells to luminescent carbon nanodots for simultaneous monitoring via optical waveguiding. The steady-state photoluminescence (PL) measurement provides evidence of the energy transfer between the donors and the acceptors. In the time-resolved PL study, a shortening (lengthening) of the photoluminescence decay time in the quantum-well donor (the CNDs acceptors) was observed during the energy interaction between the donors and acceptors. The distance dependence of the energy transfer rate is found to be proportional to 1/d3, which is dominated by two-dimensional materials coupling with point-like dipoles. The maximum energy-transfer efficiency of this energy transfer system can be as high as 80%.

Keywords: carbon nanodots, nonradiative energy transfer, optical waveguiding