Local Ce environments and their effects on optical properties of SrS phosphors

In this study, we use electron paramagnetic resonance (EPR), optical absorption, and photoluminescence (PL) spectroscopies to determine the various Ce environments in SrS phosphor materials and how these affect absorption and emission properties. As the Ce concentration is increased from 450 to 7500...

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Bibliographic Details
Published in:Journal of applied physics 1996-12, Vol.80 (12), p.7036-7040
Main Authors: Warren, W. L., Vanheusden, K., Seager, C. H., Tallant, D. R., Tuchman, J. A., Silliman, S. D., Brower, D. T.
Format: Article
Language:English
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Summary:In this study, we use electron paramagnetic resonance (EPR), optical absorption, and photoluminescence (PL) spectroscopies to determine the various Ce environments in SrS phosphor materials and how these affect absorption and emission properties. As the Ce concentration is increased from 450 to 7500 ppm, the total EPR-active Ce3+ and optical absorption signals increase linearly with Ce concentration; by contrast, the PL intensity saturates at fairly low Ce concentrations (1000 ppm Ce). We suggest that the nonlinear behavior of the PL arises from the presence of nonradiative deexcitation pathways such as defects associated with Ce sites, or Ce–Ce pairs.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.363776