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Optical-absorption and photoionization measurements from the excited states of Ce/sup 3+/:Y/sub 3/Al/sub 5/O/sub 12/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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The optical transitions in Ce/sup 3+/:Y/sub 3/Al/sub 5/O/sub 12/ from the lowest 5d excited state of the Ce/sup 3+/ ion to the host conduction band have been investigated. Two spatially overlapped and time-sequenced laser pulses were used to observe directly the excited-state absorption (ESA) and the two-step photoionization of the cerium ions. The peak cross section of the ESA transition is (1.0 +- 0.3) x 10/sup -17/ cm/sup 2/ at 700 nm. The ESA spectrum was measured from 600 to 880 nm and is used to construct an energy-level diagram for the Ce/sup 3+/ ions relative to the energy-band states of the Y/sub 3/Al/sub 5/O/sub 12/ host. The energy gap between the lowest relaxed 5d state and the conduction-band edge is estimated to be 10 000 cm/sup -1/. Strong-probe saturation measurements indicate a slow and inefficient back-transfer of excitation to the cerium ions following the ESA. Photoconductivity measurements were used to confirm the two-step photoionization of the cerium ions.

Research Organization:
Department of Physics and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3046
OSTI ID:
6114692
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:13; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION SPECTRA
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERIUM IONS
CHALCOGENIDES
CHARGED PARTICLES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
IONIZATION
IONS
OXIDES
OXYGEN COMPOUNDS
PHOTOCONDUCTIVITY
PHOTOIONIZATION
PHYSICAL PROPERTIES
SPECTRA
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES