Luminescence of F sup + centers in CaO crystals under pulsed-laser excitation

Journal Article · Wed May 15 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.11991· OSTI ID:5686020

Park, J L; Chen, Y ^[1]; Williams, Jr, G P; Williams, R T ^[2]; Pogatshnik, G J ^[3]

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1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6031 (USA)
2. Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109-7507 (USA)
3. Department of Physics, Southern Illinois University, Edwardsville, Illinois 62026-1654 (USA)

Luminescence of {ital F}{sup +} centers (oxygen vacancies each with one electron) has been investigated in thermochemically reduced, electron-irradiated, and neutron-irradiated CaO crystals. Time-dependent emission spectra following laser excitation into the {ital F}{sup +} absorption band at 351 nm were measured for the three types of crystals. We observed a fast component with a lifetime {le}10 ns and a slow decay attributed to charge trapping and transport. The intensity and decay kinetics of the {ital F}{sup +} phosphorescence depended on the method by which the defects had been produced. Estimated gain coefficients for stimulated emission under pulsed laser pumping are less than 0.1 cm{sup {minus}1}. These values are significantly smaller than the absorption coefficient at the emission wavelength.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5686020
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:14; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
AMPLIFICATION
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COLOR CENTERS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELECTROMAGNETIC RADIATION
EMISSION
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
F CENTERS
GAIN
LASER RADIATION
LUMINESCENCE
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHOTOLUMINESCENCE
POINT DEFECTS
RADIATIONS
SPECTRA
STIMULATED EMISSION
VACANCIES