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The role of cerium sites in the scintillation mechanism of LSO

Naud, J. D. and Tombrello, T. A. and Melcher, C. L. and Schweitzer, J. S. (1996) The role of cerium sites in the scintillation mechanism of LSO. IEEE Transactions on Nuclear Science, 43 (3). pp. 1324-1328. ISSN 0018-9499. http://resolver.caltech.edu/CaltechAUTHORS:20141017-155020362

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Abstract

The crystal structure of Lu_2(SiO_4)O:Ce (“LSO”) has two trivalent cation sites which may be occupied by Ce^(3+) to form luminescence centers. Previous investigations revealed the existence of two distinct sets of Ce^(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^(3+). In the present report, we 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^(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.


Item Type:Article
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http://dx.doi.org/10.1109/23.507059 DOIArticle
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=507059PublisherArticle
Additional Information:© 1996 IEEE. We are grateful to R. A. Manente for growing the crystals used in this study.
Record Number:CaltechAUTHORS:20141017-155020362
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141017-155020362
Official Citation:Naud, J.D.; Tombrello, T.A.; Melcher, C.L.; Schweitzer, J.S., "The role of cerium sites in the scintillation mechanism of LSO," Nuclear Science, IEEE Transactions on , vol.43, no.3, pp.1324,1328, Jun 1996 doi: 10.1109/23.507059 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=507059&isnumber=10977
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50515
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Oct 2014 15:27
Last Modified:20 Oct 2014 15:27

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