The role of cerium sites in the scintillation mechanism of LSO
- California Inst. of Tech., Pasadena, CA (United States). Div. of Physics, Mathematics, and Astronomy
- Schlumberger-Doll Research, Ridgefield, CT (United States)
The crystal structure of Lu{sub 2}(SiO{sub 4})O:Ce (LSO) has two trivalent cation sites which may be occupied by Ce{sup 3+} to form luminescence centers. Previous investigations revealed the existence of two distinct sets of Ce{sup 3+} excitation and emission spectra and suggested that the differences in the spectra are due to differences in the crystal fields at the two lattice sites that shift the 5d levels of Ce{sup 3+}. In the present report, the authors reexamine this issue and present new evidence which suggests a different interpretation. In particular, spectra measured at 13 K suggest that both lattice sites may give rise to indistinguishable excitation and emission spectra while the second set of observed spectra may arise from Ce{sup 3+} located in interstitial sites. The evidence for the interstitial sites is a disappearance of the doublet structure in the emission spectra and a large variation in the population of the sites as a function of total cerium concentration. In addition, the results indicate that the scintillation properties of LSO are influenced by the relative population of Ce in interstitial sites compared to lattice sites as well as by differences in the transfer efficiencies to different sites.
- OSTI ID:
- 277663
- Report Number(s):
- CONF-951073-; ISSN 0018-9499; TRN: 96:018116
- Journal Information:
- IEEE Transactions on Nuclear Science, Vol. 43, Issue 3Pt2; Conference: IEEE nuclear science symposium and medical imaging conference, San Francisco, CA (United States), 21-28 Oct 1995; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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