LUMINESCENCE OF NANOSIZED ZrO[2],
D.Millers, L.Grigorjeva, Institute of Solid State Physics, University
of Latvia, 8 Kengaraga str., Riga, Latvia, W. W. Lojkowski, A.
Opalinska, High Pressure Research Center, Warsaw, Poland
Charge and energy transfer in nonosized particles can be
size-dependent since the excitonic excitation is confined in the
particle. Therefore a set from 9 nanosized ZrO[2] powders was
prepared: undoped ZrO[2] and Pr doped 1% and 2% ZrO[2] (with average
grain sizes ~11 nm, ~15 nm, ~42 nm for each kind of powder). The
luminescence of powders was excited by continuous x-ray irradiation
(50 keV, W-anode), pulsed electron beam (270 keV, 10 ns) and nitrogen
laser (3.67 eV, 8 ns). The spectra of luminescence excited by x-ray
and pulsed electron beam show some similarity, however the evolution
of spectrum is observed in time-resolved study of luminescence.
Comparison of results obtained for different grain size ZrO[2] and
ZrO[2]:Pr is carried out and possible mechanism of electronic
excitation relaxation is discussed
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