Investigation of luminescece of Nd: Y2O3 ceramics
|Olga A. Kaygorodova , Maxim G. Ivanov , Vladimir V. Osipov , Alfiya V. Rasuleva , Vladimir I. Solomonov|
Institute of Electrophysics of RAS (IEP), Ekaterinburg, Russian Federation
In present paper the pulsed cathodoluminescent (PCL) spectra of Nd: Y2O3 ceramics fabricated from nanopowders were investigated in the range of 350-800 nm . The synthesis technology and the results of structure research were presented elsewhere .
For the ceramics quality determination a nondestructive method based on the analysis of the PCL spectra in the visible range was used. Pulsed cathodoluminescence was excited and investigated by CLAVI-device .
There are three intensive neodymium bands at 399.2, 425.7 and 459.6 nm in the PCL spectra of Nd: Y2O3 nanopowders, from which the ceramics is obtained . In these ceramic specimens two types of PCL spectra were registered. The first type spectra almost coincide with the nanopowders spectra. There is the difference in the intensity. In the spectra of the second group there is the broad substrate and some bands of Nd ions didn't appear. The luminescence of all Nd: Y2O3 ceramic samples with both types of spectra was unstable. At the irradiation of the samples by electron beam the luminescence doesn't appear in the first pulses. The luminescence intensity varies randomly in different excited pulses upon spectra shape maintaining. The reason the PCL instability can be the electron traps, which capture secondary electrons produced by the electron beam. The presence of the traps was confirmed by the thermoluminescence, which was observed in all of the ceramic specimens; and these traps were explained by the presence of the anion vacancies.
Presentation: Poster at E-MRS Fall Meeting 2006, Symposium C, by Olga A. Kaygorodova
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-05-15 09:08 Revised: 2009-06-07 00:44
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