The time – resolved luminescence of Eu³⁺ in a pure and Yttria – stabilized zirconia nanocrystals was studied. For luminescence excitation different excitation sources was used: tunable pulsed solid state laser NT342/3UV (pulse duration ~4 ns) from Ekspla (210-355nm; 420-2300nm) with Andor SR-303i-B spectrometer and YAG laser 4-th harmonic (pulse duration ~2 ns) with MDR3 grating monohromator, PMT and photon counting board for time resolution measurements. The size and phase was characterized with BET and XRD (Diffractometer X’Pert Pro MPD).

 The zirconia nanocrystals were produced by the microwave driven hydrothermal method. The luminescence spectra shows typical (592nm- ⁵D₀ – ⁷F₁ and 613nm- ⁵D₀ – ⁷F₂) Eu³⁺ bands. With increase of europium concentration luminescence from host defects decreases, but Eu³⁺ luminescence increases. This indicates the energy transfer from host to dopant.

The increase of Eu concentration led to the appearance of additional ⁵D₀ – ⁷F₂ (electric dipole) luminescence band. It was showed this band is due to change of nanocrystal structure. The observed splitting as well as the decay kinetics of luminescence gave a strong witness that the Eu³⁺ in ZrO₂ is incorporated in two different symmetry sites. The XRD spectrum confirms that with increase of Eu concentration tetragonal phase appears. The ⁵D₀ – ⁷F₂ transitions in the monoclinic and tetragonal phase zirconia have slightly different energies and this was confirmed by the luminescence excitation spectra – the monoclinic and tetragonal phases have different excitation spectra.

The work was partly supported by grants 05.0026 of LCS and no. N N508 0851 33 of MNiSW granted for the years 2007 – 2009

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