Thermoluminescence of doped YAlO3 crystals

Ya. Zhydachevskii 1,3A. Durygin 3A. Suchocki 3A. Matkovskii 1,5D. Sugak 1Z. Frukacz 2G. B. Loutts 4M. A. Noginov 4

1. Lviv Polytechnic National University, 12 Bandera, Lviv 79013, Ukraine
2. Institute of Electronic Materials Technology (ITME), Wólczyńska 133, Warszawa 01-919, Poland
3. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
4. Norfolk State University, Center for Materials Research, Norfolk, VA 23504, United States
5. University of Rzeszow, Institute of Physics, Rejtana 16, Rzeszów 35-310, Poland

Abstract

The work presents results of the thermally stimulated luminescence (TSL) studies of nominally pure YAlO3 (YAP) crystals as well as the crystals doped with various dopants (among them Ho3+, Tm3+, Mn).
Measuring of thermal glow curves in the 10-600 K temperature range after preliminary exposition with Ar+-laser light (351 nm) of Xe-lamp (UV part of spectrum) shows the presence of similar glow peaks in all the crystals studied. Namely, the glow peaks near T=175 K (E=0.48+/-0.06 eV, lns=27.8+/-4.1 s-1), T=195 K (E=0.55+/-0.03 eV, lns=28.6+/-1.9 s-1), T=205 K (E=0.68+/-0.03 eV, lns=34.5+/-1.8 s-1), T=255 K (E=0.80+/-0.05 eV, lns=32.2+/-2.4 s-1), T=360 K (E=1.35+/-0.05 eV, lns=39.1+/-1.7 s-1) and T=400 K (E=1.7+/-0.1 eV, lns=44.9+/-3.0 s-1) were observed. Besides, two (or maybe more) feebly pronounced glow peaks at T<100 K as well as the peak near T=320 K were observed in some crystals.
It was shown that the transient optical absorption of YAP crystals near 15000 cm-1 described in [1] correlates by activation energy with the low-temperature thermal glow peak at 255 K.
TSL spectra of YAP:Mn crystals correspond to intra-center luminescence of Mn4+ ions. TSL spectra of nominally pure YAP and YAP:Ho crystals also correspond to Mn4+ ions, which are present in the crystals as uncontrolled impurity and obviously act as recombination centers. Whereas TSL spectra of YAP:Tm crystals in visible region correspond to intra-center luminescence of Tm3+ ions that testifies energy transfer processes between point defects and Tm3+ ions.
The effect of preliminary annealing (T>1000 K) in reducing or oxidizing atmosphere on the TSL properties of the crystals has been studied.
On the basis of the obtained results a nature of trap centers and mechanisms of recombination are discussed.
[1] A. Matkovski, A. Durygin, A. Suchocki, et al. Optical Mater. 12 (1999) 75.

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium A, by Ya. Zhydachevskii
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-08 15:01
Revised:   2009-06-08 12:55
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