Hannover 2010 – scientific programme

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MO: Fachverband Molekülphysik

MO 27: Poster: Cluster

MO 27.7: Poster

Thursday, March 11, 2010, 16:00–18:30, Lichthof

Ultraviolet photoluminescence of ideal nanodiamonds - diamondoids — •David Wolter¹, Lasse Landt¹, Witoslaw Kielich², Matthias Staiger¹, Christoph Bostedt³, and Thomas Möller¹ — ¹Technische Universität Berlin — ²Universität Kassel — ³LCLS Stanford

Nanodiamonds, so called diamondoids are carbon clusters with perfect bulk diamond structure and complete hydrogen passivation. Diamondoids can be perfectly size-selected and isomer resolved even in their neutral state. This has made possible a variety of investigations on the size and shape dependence of their electronic structure and optical properties.

We studied the photoluminescence of nanodiamonds and found intrinsic photoluminescence in the ultraviolet regime for adamantane (C₁₀H₁₆), the smallest one in a series of hydrogen-passivated diamond clusters (diamondoids)[1]. The luminescence can be ascribed to recombination of selftrapped excitons. The inclusion of high amounts of nitrogen into the nanodiamonds crystal lattice, using the example of urotropine (hexamethylenetetramine), is found to quench the luminescence.

[1] L.Landt, D.Wolter et al. Phys. Rev. B 80, 205323 (2009)