A temperature effect in the luminescence emission from electron-irradiated MgO

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458596· OSTI ID:7057518

Caulfield, K J; Cooper, R ^[1]; Boas, J F ^[2]

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1. Department of Physical Chemistry, The University of Melbourne, Parkville, Victoria 3052, Australia (AU)
2. Australian Radiation Laboratory, Lower Plenty Road, Yallambie, Victoria 3085 (Australia)

The temperature dependence of luminescence emissions from electron-irradiated CaO and MgO single crystals has been studied by time resolved luminescence spectroscopy after pulsed nanosecond irradiation with 0.20 to 0.60 MeV electrons. Emissions from CaO at 375 nm at both 293 and 83 K, show similar threshold characteristics for atomic displacement. These have been attributed to the displacement of oxygen ions and subsequent electron trapping, resulting in the formation of F{sup +} centers. The threshold energy of 0.32{plus minus}0.01 MeV corresponds to an oxygen displacement energy of 58{plus minus}2 eV. A 380 nm emission from MgO, also attributed to oxygen displacement and F{sup +} center formation, shows no temperature effect, with a displacement threshold virtually identical to that for CaO. A 235 nm emission from MgO shows a significant temperature effect. The threshold energy at 293 K is 0.31{plus minus}0.01 MeV, whilst at 83 K two thresholds are observed, 0.31{plus minus}0.01 and 0.41{plus minus}0.01 MeV.

• OSTI ID: 7057518
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:11; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
ALKALINE EARTH METAL COMPOUNDS
BEAMS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRON BEAMS
ENERGY RANGE
F CENTERS
KEV RANGE
KEV RANGE 100-1000
LEPTON BEAMS
LOW TEMPERATURE
LUMINESCENCE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MEDIUM TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
TEMPERATURE DEPENDENCE
TEMPERATURE EFFECTS
VACANCIES