Strong infrared-to-visible frequency upconversion in Er-doped Sr2CeO4 powders |
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Authors: | Nikifor Rakov Renato B Guimarães |
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Institution: | a PG-Ciência dos Materiais, Universidade Federal do Vale do São Francisco, 48902-300 Juazeiro, BA, Brazil b Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil |
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Abstract: | Efficient upconversion (UC) luminescence is demonstrated in Er3+:Sr2CeO4 powders prepared by combustion synthesis and exposed to near-infrared (∼975 nm) radiation. The UC emission lines observed at ∼530, ∼550 and ∼665 nm correspond, respectively, to 2H11/2→4I15/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 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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Keywords: | Powder phosphors Upconversion Rare-earths |
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