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• W1520320921 abstract "Abstract The rare earth Er 3+ and Yb 3+ codoped system is the most attractive for showcasing energy transfer upconversion. This system can generate green and red emissions from Er 3+ under infrared excitation of the sensitizer Yb 3+ . It is well known that the red-emitting state can be populated from the upper green-emitting state. The contribution of multiphonon relaxation to this population is generally considered important at low excitation densities. Here, we demonstrate for the first time the importance of a previously proposed but neglected mechanism described as a cross relaxation energy transfer from Er 3+ to Yb 3+ , followed by an energy back transfer within the same Er 3+ –Yb 3+ pair. A luminescence spectroscopy study of cubic Y 2 O 3 :Er 3+ , Yb 3+ indicates that this mechanism can be more efficient than multiphonon relaxation, and it can even make a major contribution to the red upconversion. The study also revealed that the energy transfers involved in this mechanism take place only in the nearest Er 3+ –Yb 3+ pairs, and thus, it is fast and efficient at low excitation densities. Our results enable a better understanding of upconversion processes and properties in the Er 3+ –Yb 3+ system." @default.
• W1520320921 created "2016-06-24" @default.
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• W1520320921 date "2015-01-16" @default.
• W1520320921 modified "2023-10-16" @default.
• W1520320921 title "Observation of efficient population of the red-emitting state from the green state by non-multiphonon relaxation in the Er3+–Yb3+ system" @default.
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• W1520320921 doi "https://doi.org/10.1038/lsa.2015.12" @default.
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