Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 95: Poster IV B (Quantum dots and wires: Prepration, characterization, optical properties, and transport)

HL 95.19: Poster

Donnerstag, 19. März 2015, 14:00–20:00, Poster B

Metal-enhanced luminescence of CdSe and Au nanoparticles in colloidal solution — •Evelyn Röder, Nils Rosemann, Beatriz Pelaz, Wolfgang J. Parak, Sangam Chatterjee, and Nadeem Sabir — Faculty of Physics and Materials Science Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany

Cadmium selenide semiconductor nanoparticles (SNP) show a strong photoluminescence (PL) that can be tuned either by doping or changing the structure of the SNP [1]. Their emission is further enhanced by plasmonic effects in the vicinity of metals [2,3]. We investigate the origin of this interaction by studying a series of CdSe-SNPs mixed with Au-based metallic nanoparticles (MNP) in solution with varying concentration ratio of SNP and MNP by UV/VIS absorption and time-resolved photoluminescence (PL) spectroscopy. We find a non-linear dependence of the PL intensity on the concentration ratio along with a photon-energy-dependent quenching of the absorption.

[1] Gaponik et al., 2010, 2010, 6, 1364-1378

[2] Kulakovich et al., 2002, Nanoletters Vol.2, No. 12 1449-1452

[3] Okamoto et al., 2006, J. Opt. Soc. Am. B/Vol. 23, No. 8