Plasmon-enhanced Förster energy transfer between semiconductor quantum dots: multipole effects.
We experimentally demonstrated plasmon-assisted energy transfer (ET) between CdSe semiconductor quantum dots (QDs) self-assembled in a monolayer by using time-resolved micro-photoluminescence (PL) technique. The enhancements of PL intensity and ET efficiency were manipulated by adjusting thickness (Delta) of SiO(2) coating on large Ag nanoparticles. The PL enhancement factor of the acceptor QDs and the PL intensity ratio of acceptor-to-donor reached their maxima approximately 47 and approximately 14 when Delta = 7 nm, the corresponding ET efficiency reached 86%. We also presented theoretical analysis based on the rate equation. The theoretical calculations agreed with experimental data and revealed interesting physics of multipole effect, and metal nanoparticle induced quench effect and plasmon-enhanced Förster ET.
Su
Xiong-Rui
XR
Department of Physics, Wuhan University, Wuhan 430072, P. R. China.
Zhang
Wei
W
Zhou
Li
L
Peng
Xiao-Niu
XN
Wang
Qu-Quan
QQ
D004735:Energy Transfer; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods; D008027:Light; D049449:Luminescence; D053768:Metal Nanoparticles / Q000737:chemistry; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008962:Models, Theoretical; D036103:Nanotechnology / Q000379:methods; D055095:Optics and Photonics; D010825:Physics / Q000379:methods; D045663:Quantum Dots; D012666:Semiconductors; D013053:Spectrophotometry / Q000379:methods