Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 2: Electronic Spectroscopy
MO 2.6: Vortrag
Montag, 12. März 2012, 11:45–12:00, V38.02
Intrinsic Luminescence of Diamondoids in the Ultra-Violet Spectral Region — •Philipp Reiß1, David Wolter2, Torbjörn Rander2, Robert Richter2, Peter Schreiner3, Arno Ehresmann1, and Thomas Möller2 — 1Institut für Physik, Universität Kassel, 34132 Kassel — 2Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin — 3Institut für Organische Chemie, Justus-Liebig-Universität Giessen, 35392 Giessen
Clusters and nanocrystals with semiconducting properties are of interest for science and industry due to their size-dependent electronic structure. While currently only direct band gap semiconductors like GaAs are used in light-emitting devices, luminescence of Silicon nanostructures has already been discovered in 1990 and drew attention to the light emission of elemental indirect band gap semiconductor nanostructures. Despite the focus on Si, the underlying origins of the luminescence which are still not fully determined are expected to be of a more universal nature.
Dispersed luminescence and total luminescence yields of various types of diamondoids have been recorded after photoexcitation with synchrotron radiation. Both the excitation energies end photoemission spectra are in the ultraviolet spectral range. Strong dependencies of emission and absorption spectra on the size and shape of the diamondoids have been measured.