Hole and electron traps in the YAlO{sub 3} single crystal scintillator

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.80.045114· OSTI ID:21294229

Laguta, V V; Nikl, M; Rosa, J ^[1]; Vedda, A ^[2]; Mihokova, E ^[1]; Blazek, K ^[3]

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1. Institute of Physics, Academy of Sciences of the Czech Republic, 10 Cukrovarnicka Street, 16253 Prague 6 (Czech Republic)
2. Department of Materials Science, University of Milano-Bicocca, via Cozzi 53, 20125 Milan (Italy)
3. CRYTUR Ltd., Palackeho 175, 511 19 Turnov (Czech Republic)

The processes of hole and electron localization in YAlO{sub 3} single crystals were investigated by electron-spin resonance. It was found that holes created by UV or x-ray irradiation are trapped at regular oxygen ions forming two types of O{sup -} hole centers corresponding to hole localization at two inequivalent oxygen ions which are located in Y and Al planes, respectively. The hole can be either autolocalized or additionally stabilized by a defect in the neighborhood of the oxygen ion such as yttrium vacancy or an impurity ion at Y site. This leads to a variety of O{sup -} centers which differ both by thermal stability (from about 14 K up to room temperature) and spectral parameters. Electron-type trapping sites are assigned to Y{sub Al} antisite ions. After trapping an electron they become paramagnetic Y{sub Al}{sup 2+} centers. They are found in several configurations with thermal stability up to above 300 K that enables the radiative recombination of freed holes with such localized electrons and the appearance of thermoluminescence peaks. It is shown that the electron trapped around Y{sub Al} antisite ion is additionally stabilized either by an oxygen vacancy or by a defect at Y site. The yttrium antisite ions in the lattice were directly identified by {sup 89}Y nuclear magnetic resonance.

• OSTI ID: 21294229
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 80, Issue 4; Other Information: DOI: 10.1103/PhysRevB.80.045114; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
CONFIGURATION
CRYSTAL DEFECTS
ELECTRON SPIN RESONANCE
ELECTRONS
EXCITATION
HOLES
IMPURITIES
IRRADIATION
MONOCRYSTALS
NUCLEAR MAGNETIC RESONANCE
OXYGEN
OXYGEN COMPOUNDS
OXYGEN IONS
PARAMAGNETISM
RECOMBINATION
STABILITY
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMOLUMINESCENCE
TRAPPING
TRAPS
ULTRAVIOLET RADIATION
X RADIATION
YTTRIUM 89
YTTRIUM COMPOUNDS