Previously we reported near-infrared fluorescence emission and excitation spectra from neptunyl and plutonyl ions.  Here we present additional results on the Cs2NpO2Cl4 system doped at different concentrations into an isostructural, crystalline uranyl host.  Spectra were measured from single crystals of Cs2NpO2Cl4 and from crystals of Cs2UO2Cl4 doped with the neptunyl ion at concentrations ranging from 3% to 50%.  The Np near-infrared luminescence is stimulated by excitation of either ligand-to-metal charge-transfer or intra-5f transitions of the Np.  There are indications of energy transfer to luminescent excited states of neptunyl following excitation of the uranyl ion in the host crystal.  At low Np concentrations, green luminescence typical of uranyl is observed.  Increase in Np concentration leads to quenching of the green uranyl emission coincident with stimulation of the Np near-infrared emission. In this presentation, we will describe the observed transitions, as well as decay kinetics and the excitation spectra in the visible and near-infrared spectral regions.  LA-UR 12-26052

Optically excited near-infrared photoluminescence from NpO?2?2+? in Cs?2?U(Np)O?2?Cl?4?

245th National Meeting (2013)

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