Direct observation of edge luminescence excited by long-lived-exciton-polariton propagation in CdS.

Tuning the Luminescence of CdS Quantum Dots by a Simple Method

In this report, we present a facile approach for the synthesis of luminescent CdS and CdS:Mn+2 nanocrystals by reaction of CdSO4 and Na2S2O3 in the presence of thioglycerol (C3H8O2S) as capping agent. The influence of various experimental variables including, pH values and percentage of dopant, on the growth...

Long delays of light in ZnO caused by exciton-polariton propagation

Surface states in the photoionization of high-quality CdSe core/shell nanocrystals.

We use electric force microscopy (EFM) to study single nanocrystal photoionization in two classes of high-quality nanocrystals whose exciton luminescence quantum yields approach unity in solution. The CdSe/CdS/ZnS core/shell nanocrystals do not photoionize, while the CdSe/CdS nanocrystals do show substantial photoionization. This verifies the theoretical prediction that the ZnS shell confines t...

An Xafs and Xeol Study on the Structure and Optical Properties of Cds/porous Silicon (cds/ps) Composite Nanostructure

Electrochemically deposited CdS nanoparticles (NPs) were formed using porous silicon (PS) as a substrate/electrode. The structure, electronic behavior of the CdS NPs and the interaction between CdS-PS were systematically examined using electron microscope, X-ray diffraction and X-ray absorption fine structure (XAFS) at S K-edge and Si K-edge. The optical luminescence behavior of the nanocomposi...

The role of long-lived dark states in the photoluminescence dynamics of poly„phenylene vinylene... conjugated polymers. II. Excited-state quenching versus ground-state depletion

The two pulse fluorescence bleaching experiments reported in an earlier paper @J. Chem. Phys. 117, 454 ~2002!# are reanalyzed in the context of additional experiments. The fluorescence bleaching observed in that paper was originally ascribed to ground-state depletion. By analyzing the absorption saturation behavior and the magnitude of the pump–probe signal, we find that the absorption cross se...