High pressure luminescence studies of localized excitations in ZnS doped with Pb/sup 2 +/ and Mn/sup 2 +/

Journal Article · Sat Oct 01 04:00:00 EDT 1977 · J. Chem. Phys.; (United States)

OSTI ID:7215012

House, G L; Drickamer, H G

High pressure luminescence measurements have been made on ZnS doped with Pb/sup +2/ and Mn/sup +2/. The data include changes in peak energy and shape, integrated intensities, and lifetimes. These localized emissions are treated in terms of a single configuration coordinate model. For Pb/sup +2/ the emission peak shifted to lower energy by a moderate amount and narrowed. For excitation in the Pb/sup +2/ absorption the intensity was independent of pressure, which is consistent with the fact that the energy barrier for radiationless return to the ground state was high at all pressures. For excitation in the ZnS absorption edge the intensity decreased significantly with pressure above about 80 kbar. Data on shifts of the conduction band with pressure would indicate that one is approaching a transition from a direct to indirect transition at high pressure so that decrease in emission intensity may be associated with decreased absorption efficiency. The Mn+/sup 2/ emission peak shifted strongly to lower energy with increasing pressure. The direction and magnitude of the shift were consistent with the predictions of ligand field theory. The intensity doubled in 100 kbar, while the lifetime decreased by roughly a factor of 2. These results could be described in terms of a model for a phonon assisted transition. In addition, peak location, intensity, and lifetime measurements were made on ZnS:Pb:Mn. There is clear evidence of energy transfer by exchange, but in addition there is a nonradiative process in the doubly doped crystal which affects both intensities and lifetimes.

• Research Organization: School of Chemical Sciences and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
• OSTI ID: 7215012
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 67:7; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHALCOGENIDES
DOPED MATERIALS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
HIGH PRESSURE
INORGANIC PHOSPHORS
LEAD
LUMINESCENCE
MANGANESE
METALS
PHOSPHORS
PRESSURE DEPENDENCE
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
ZINC COMPOUNDS
ZINC SULFIDES