Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Light emission of semiconductor nanocrystals is a complex process, depending on many factors, amongst which the quantum mechanical size confinement of excitons (coupled electron-hole pairs) and the influence of confined phonon modes and the nanocrystal surface. Despite years of research the nature of nanocrystal emission at low temperatures is still under debate. Here we unravel the different optical recombination pathways of CdSe/CdS dot-in-rod systems, by using self-assembled dot-in-rod arrays. This allows us to orient the crystallographic wurtzite c-axis of the dots relative to the light observation direction and the direction of an applied magnetic field.
Fluorescence line narrowing experiments on multilayer CdSe/CdS dot-in-rod arrays show an unprecedented number of narrow emission peaks. The origin of all these peaks is established through their behaviour in high magnetic field. We observe a clear signature of acoustic-phonon assisted transitions, separated from the zero-phonon emission and optical-phonon replicas [1].Exciton lifetime experiments on self-assembled monolayers of CdSe/CdS dot-in-rods demonstrate that the recombination of the dark exciton ground state strongly depends on the emission angle.
Our results prove that nanocrystal light emission results from an intricate interplay between bright (optically allowed) and dark (optically forbidden) exciton states, coupled to both acoustic and optical phonon modes [1].
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