High pressure study of slow phosphorescence in La/sub 2/O/sub 2/S:Eu)

Journal Article · Thu May 01 04:00:00 EDT 1980 · J. Chem. Phys.; (United States)

OSTI ID:5417481

Webster, G A; Drickamer, H G

The effect of pressure has been measured on the decay rate of the slow phosphorescence in La/sub 2/O/sub 2/S:Eu. Although the trap structure is complex, the decay curves could be approximated as the sum of two exponentials for purposes of discussion. Activation energies for detrapping were extracted from the decay times. For the ''shallow traps,'' the activation energy increases linearly with pressure at a rate of 13 cm/sup -1//kbar. For the ''deep traps' the change in activation energy with pressure is approx.4 cm/sup -1//kbar at low pressure and increases to about 14 cm/sup -1//kbar by 40 kilobar. One can conclude that the ''shallower trap'' (thermally released) storage increases with pressure, as does the depth of the shallowest traps studied. The fraction of the holes captured by the shallowest traps also increase with pressure.

• Research Organization: School of Chemical Sciences and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
• OSTI ID: 5417481
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 72:9; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ACTIVATION ENERGY
ALLOYS
ENERGY
EUROPIUM ADDITIONS
EUROPIUM ALLOYS
INORGANIC PHOSPHORS
LANTHANUM COMPOUNDS
LUMINESCENCE
OXYGEN COMPOUNDS
PHOSPHORESCENCE
PHOSPHORS
PRESSURE DEPENDENCE
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SULFUR COMPOUNDS
TRAPPING