| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5402204 | Journal of Luminescence | 2011 | 5 Pages |
Abstract
Efficient upconversion (UC) luminescence is demonstrated in Er3+:Sr2CeO4 powders prepared by combustion synthesis and exposed to near-infrared (â¼975Â nm) radiation. The UC emission lines observed at â¼530, â¼550 and â¼665Â nm correspond, respectively, to 2H11/2â4I15/2, 4S3/2â4I15/2 and 4F9/2â4I15/2 4f-4f transitions of Er3+. X-ray powder diffraction data showed that the SrCO3 phase (impurity) is dramatically reduced when Sr2+ is partially substituted by Mg2+ ions. The UC phenomenon was investigated by use of continuous wave and pulsed laser excitation and the UC mechanism was attributed to energy transfer between excited Er3+ ions.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Nikifor Rakov, Renato B. Guimarães, Glauco S. Maciel,