Photoconversion of {ital F}-type centers in thermochemically reduced MgO single crystals

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.59.4786· OSTI ID:306262

Gonzalez, R; Monge, M A; Santiuste, J E; Pareja, R ^[1]; Chen, Y ^[2]; Kotomin, E ^[3]; Kukla, M M ^[3]; Popov, A I ^[3]

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1. Departamento de Fisica, Escuela Politecnica Superior, Universidad Carlos III, Butarque 15, 28911 Leganes, Madrid (Spain)
2. Division of Materials Science, Department of Energy, Germantown, Maryland 20874-1290 (United States)
3. Institute for Solid State Physics, University of Latvia, 8 Kengaraga, LV-1063 Riga (Latvia)

Optical absorption and luminescence experiments were used to study the photoconversion of neutral oxygen vacancies ({ital F} centers) in MgO single crystals thermochemically reduced at elevated temperatures. In crystals with an undetectable concentration of hydride ions and a moderate concentration of {ital F} centers ({approx}10{sup 17} cm{sup {minus}3}), excitation with UV-light produces positively charged anion vacancies (F{sup +} centers) and electrons which are subsequently trapped at impurities. Under continuous excitation, the F{sup +} centers release holes which are trapped at cation vacancies charge compensated by impurities. In crystals with high concentrations of both hydride ions and {ital F} centers ({approx}10{sup 18} cm{sup {minus}3}), the electrons from the {ital F} to F{sup +} photoconversion are trapped mainly at the hydride ions to form H{sup 2{minus}} ions, which are metastable at room temperature. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 306262
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 7 Vol. 59; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTRA
CRYSTAL DEFECTS
F CENTERS
HOLES
HYDRIDES
IONS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
PHOTOLUMINESCENCE
REDUCTION
THERMOCHEMICAL PROCESSES
TRAPPING
TRAPS
VACANCIES