Localized Surface Plasmon And Quantum Dots Coupled Fluorescent Resonance Energy Transfer

Fluorescence resonance energy transfer(FRET)controlled by surface plasmon is a very important light-matter interaction phenomenon.Understanding this phenomenon in-depth will result in the improvement of the efficiency of light emitting devices,solar energy capture devices,bioimaging,and biosensors.In this paper,the energy transfer between semiconductor quantum dots(QDs)controlled by surface plasmon polaritons is investigated.The results are listed below:1.A high yield synthesis method of gold nanorods(GNR)was developed,which provides with GNR with uniform size.In the gold seed preparation process,sodium oleate was added to keep the gold rods more uniform during the growth process.At the same time,during synthesis,the use of cetyltrimethylammonium bromide(CTAB),a toxic reagent,was also reduced comparing with reported literature.Moreover,by regulating the concentration of gold seed and silver ions in preparing,it is found that more gold seeds means smaller gold rod size and larger aspect ratio.High silver ion concentration can increase the aspect ratio of gold nanorods.2.Fluorescence resonance energy transfer(FRET)between QDs controlled by surface plasmon was achieved by using the GNR@Si02@QDs structure.In this structure,the thickness of the silica can be effectively controlled by adjusting the amount of tetraethyl orthosilicate(TEOS)additon,the number of times of addition,and the concentration of CTAB.The efficiency of energy transfer is positive correlation with spectral overlap area.By using GNR coupled with quantum dots(QDs)whose luminescence are located-at 525 nm(QD525)and 605 nm(QD605),the energy transfer efficiency from QD525 to QD605 is 35.34%,and the fluorescence intensity of QD605 is increased by 2 times.3.Construct of the FRET of QDs in thin film structures was also investigated via layer-by-layer self-assembly method.In the thin film structure,the energy transfer efficiency from donor QDs to acceptor QDs is 7.32%.The acceptor QDs fluorescence intensity is increased by about 3 times.