OPTICAL-PROPERTIES OF NI2-RESOLVED SPECTROSCOPY( IN FLUORIDE INVESTIGATED BY TIME)

The optical properties of Ni2+-doped barium-indium-gallium-based (BIGa ZYT) and lead-based (PBI) fluoride glasses have been investigated. Abs orption and luminescence measurements performed over a wide temperatur e range indicate that the dopant ion occupies a site of nearly-octahed ral symmetry. We observe three luminescence transitions (green, red an d NIR) which are assigned to the 1T2(1D)-->3A2(3F), 1T2(1D)-->3T2(3F) and 1T2(1D)-->3T1(3F) transitions of the Ni2+ ion. Steady-state emissi on spectra and luminescence decay times as a function of temperature h ave been measured to determine the presence and extent of nonradiative transitions. In order to correlate glass-matrix composition with emis sion spectral properties, detailed time resolved measurements have bee n performed.