Abstract
Optical absorption, time-resolved luminescence and fluorescence decay measurements of Ni2+-doped fluorozirconate glasses are reported. Time-resolved luminescence measurements have been taken exciting the samples at different wavelengths. The position of the green emission abnd (the 1T2g(D→3A2g(F) transition) moves slightly to the blue when the excitation is changed to higher energies. For a fixed excitation wavelength, the emission moves also to the blue when the time of measurement after the laser pulse increases. The fluorescence decays are non-exponential and depend on the detection wavelength. They are slower for the shorter detection wavelengths. The results show a distribution of Ni2+ sites with different ‘crystal field’ environments.
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