6533b7d2fe1ef96bd125f6b8
RESEARCH PRODUCT
Investigations of the emission properties of single CdS-nanocrystallites
Jakob TittelAndreas KornowskiFelix KoberlingThomas BaschéAlf MewsWolfgang GöhdeAlexander EychmüllerHorst Wellersubject
Microscopebusiness.industryBand gapChemistryGeneral Chemical EngineeringExcitonAnalytical chemistryFluorescenceMolecular physicsBlueshiftlaw.inventionSemiconductorNanocrystallawCondensed Matter::SuperconductivityEmission spectrumbusinessdescription
Semiconductor nanocrystallites (NCs) with a radius in the range of the bulk exciton radius exhibit a strong quantum size effect. We investigated CdS-NCs, that were spin coated on a glass cover slip, with a low temperature confocal microscope. At low coverage we could image the fluorescence light from single NCs. The typical emission spectra of single NCs show four peaks. Besides the main peak related to near bandgap recombination, up to two LO-phonon satellites and one blue shifted peak were observed. It could be shown that the absorption can be polarization dependent. From the images as well as from the intensity autocorrelation function it could be concluded that the fluorescence emission of single NCs is interrupted by dark periods. In addition, spectral shifts in the dispersed fluorescence emission could be observed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-11-01 |