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HL: Fachverband Halbleiterphysik

HL 9: Quantum Dots: Preparation and Characterization

HL 9.2: Vortrag

Montag, 20. März 2017, 09:45–10:00, POT 112

Fluorescence behavior of semiconductor nanoparticles in vicinity of plasmonic metals — •Simon Schneider, Elvira Kröger, Xiao Tang, Christian Strelow, Tobias Kipp, and Alf Mews — Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany

Interactions of plasmonic metal nanoparticles with semiconductor nanoparticles greatly influence the fluorescence behavior of the latter. If introduced to a plasmonic resonant system, the rate of spontaneous emission can be enhanced (Purcell effect). Here, the distance between the metal- and semiconductor nanoparticles has a huge influence on the fluorescence behavior of the whole system, direct contact of the two parts leads to complete fluorescence quenching. We control the distance between metal and CdSe/CdS semiconductor dot-in-rod (DR) structures on the nanometer scale using a silica shell around the DRs as a dielectric spacer and investigate the effect of attached plasmonic metals (Ag & Au) on the fluorescence behavior of the DRs. Metal nanoparticles of 2-3 nm in diameter only showed little to no effect whereas the growth of a continuous gold shell around the DRs doubled the fluorescence-decay rate.