The synthesis and characterization of PtS2 nanoclusters synthesized in AOT/hexanol/heptane inverse micelles are reported. Electron diffraction and optical spectroscopy have been used to characterize these nanoclusters. The electron diffraction results show that the nanoclusters have the same crystal structure as bulk PtS2 and are consistent with the nanoclusters being a single S-Pt-S trilayer. Absorption spectroscopy shows that these nanoclusters have an indirect band gap of 1.58 eV as compared to 0.87 eV for bulk PtS2. The nanoclusters can be grown such that their mass is doubled, resulting in a band gap of 1.27 eV. PtS2 nanoclusters doped with 1-5% Eu3+ were also synthesized in AOT/hexanol/heptane and tridodecylmethylammonium chloride (TDAC)/hexanol/octane inverse micelles. The m(j) structure and relative intensities of Europium emission lines are indicative of the symmetry of the local environment and hence the location of the Eu3+ ion. It is concluded that synthesis of doped nanoclusters in TDAC/hexanol/octane results in Eu3+ ions that are situated in the near-octahedral holes of the PtS2 lattice, while an AOT/hexanol/heptane synthesis results in a Eu3+ ion on the nanocluster edges. The emission and fluorescence excitation spectra show that 4.0 eV optical excitation of the nanocluster results in energy transfer and subsequent luminescence of the europium dopant. Since the europium excited state is at a higher energy than the band gap, it is concluded that energy transfer to the dopant competes with energy relaxation of the electron/hole pair. Passivation of the nanocluster surface trap states is observed to increase the intensity of europium luminescence, and we conclude that trapping also competes with electron/hole energy relaxation.