Energy Transfer from Dual-Emission Manganese-Doped Quantum Dots to Graphene Oxide

The combination of doped quantum dots (QDs) and graphene oxide (GO) results in QD-GO composites with enhanced light absorption properties. When exposed to light, the dual-emission Mn2+-doped ZnS QD-GO composite exhibits nonradiative energy transfer from photoexcited QDs to GO. Using steady-state spectroscopy and time-resolved spectroscopy, we find that the energy transfer efficiency between QDs' surface defects and GO is higher than that between isolated Mn2+ ions and GO. Moreover, the increase of GO concentration and reduction degree can improve the electron population of defect states of QDs, while the electron population in Mn2+ ions is relatively less affected by GO. This study leads to a better understanding of the energy transfer dynamics between dual-emitting Mn2+-doped ZnS QDs and GO and should greatly contribute to the design of high-performance QD-based optoelectronic devices.

Automated summary

The combination of doped quantum dots and graphene oxide results in QD-GO composites with enhanced light absorption properties, improving the energy transfer efficiency between QDs and GO. Moreover, increasing the concentration and reduction degree of GO can enhance the electron population of defect states of QDs.