Radiative Decay of Electronic Excitations in ZrO Nanocrystals and Macroscopic Single Crystals

Krisjanis Smits, Larisa Grigorjeva, Donats Millers, Janusz D. Fidelus, and Witold Lojkowski

Abstract—The time-resolved luminescence was studied for
ZrO:Y single crystal and nanocrystals. The similar recombination
centres were found in both—single crystal and nanocrystals.
Luminescence decay is within 200 ns in nanocrystals, whereas it
extends to the microseconds in single crystal. It was shown that
the defects responsible for transient absorption were not involved
directly in radiative recombination process.

IEEE Transactions on Nuclear Science, VOL. 55, NO. 3, JUNE 2008

Digital Object Identifier 10.1109/TNS.2008.924077

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Luminescence Properties of ZnO Nanocrystals and Ceramics

Larisa Grigorjeva, Donats Millers, Janis Grabis, Claude Monty, Aleksandr Kalinko, Krishjanis Smits,
Vladimir Pankratov, and Witold Łojkowski

Abstract—The luminescence excitation spectra, luminescence
spectra and the nanosecond-scale decay kinetics were studied.
The ZnO and ZnO:Al nanopowders were prepared by vaporization-
condensation in a solar furnace using different raw powders:
commercial, hydrothermal and those obtained by plasma synthesis.
Exciton-phonon as well as exciton-exciton interaction
processes in nanopowders, a bulk crystal and ZnO ceramics were
studied and compared. The fast decay and low afterglow intensity
of ZnO nanopowders and ceramics support these materials for
scintillators.

IEEE Transactions on Nuclear Science, VOL. 55, NO. 3, JUNE 2008

Digital Object Identifier 10.1109/TNS.2008.921931

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