Surface plasmon coupling effects on the f?rster resonance energy transfer from quantum dot into rhodamine 6G
Journal
Nanotechnology
Journal Volume
32
Journal Issue
29
Date Issued
2021
Author(s)
Abstract
Rhodamine 6G (R6G) molecules linked CdZnSeS/ZnS green-emitting quantum dots (QDs) are self-assembled onto Ag nanoparticles (NPs) for studying the surface plasmon (SP) coupling effect on the F?rster resonance energy transfer (FRET) process from QD into R6G. SP coupling can enhance the emission efficiency of QD such that FRET has to compete with QD emission for transferring energy into R6G. It is found that FRET efficiency is reduced under the SP coupling condition. Although R6G emission efficiency can also be enhanced through SP coupling when it is directly linked onto Ag NP, the enhancement decreases when R6G is linked onto QD and then the QD-R6G complex is self-assembled onto Ag NP. In particular, R6G emission efficiency can be reduced through SP coupling when the number of R6G molecules linked onto a QD is high. A rate-equation model is built for resembling the measured photoluminescence decay profiles and providing us with more detailed explanations for the observed FRET and SP coupling behaviors. ? 2021 IOP Publishing Ltd.
Subjects
Energy transfer; Forster resonance energy transfer; Molecules; Nanocrystals; Semiconductor quantum dots; Silver nanoparticles; Surface plasmon resonance; Ag nanoparticle; Coupling condition; Coupling effect; Emission efficiencies; Photoluminescence decay; Rate-equation models; Resonance energy transfer; Surface plasmon coupling; Surface plasmons
Type
journal article