| Abstract
| - A series of binary (HgSe) and ternary (HgSe1-xSx) mercury chalcogenide clusters are synthesized utilizing acolloidal technique involving the phase separation of metal and chalcogen precursors in the presence of strongHg(II) coordinating ligands. The clusters vary in size between 2 and 3 nm and possess the cubic zinc blendestructure of the bulk. Energy-dispersive X-ray measurements show that the composition of the ternary materialcan be varied throughout the entire composition range from HgS to HgSe. In all cases, the linear absorptionof these binary and ternary species is narrow with well-resolved transitions at both the band edge and athigher energies. Complementary band edge emission is also observed with no apparent deep trap emission.Size- and composition (x)-dependent optical properties of these clusters are investigated using photoluminescence (PL) and photoluminescence excitation (PLE) spectra. In the case of HgSe clusters, the size-dependentbehavior of up to four excited states is followed. For HgSe1-xSx clusters, where x varies from 0 to 1, asize/composition-dependent progression of up to five excited states is observed.
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