TIME-RESOLVED SPECTROSCOPY OF NI-DOPED FLUOROZIRCONATE GLASSES

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 sample s at different wavelengths. The position of the green emission band (t he 1T2g(D) --> 3A2g(F) transition) moves slightly to the blue when the excitation is changed to higher energies. For a fixed excitation wave length, the emission moves also to the blue when the time of measureme nt after the laser pulse increases. The fluorescence decays are non-ex ponential 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.