The unusual changes in the red-to-green (R/G) ratio, characterized by a decreasing trend contrary to the typical increase, prompted an investigation into the mechanism of UC processes.
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Untypical tuneable emission activated by NIR radiation observed in gadolinium borate nanomaterials doped with Yb<sup>3+</sup>, Ho<sup>3+</sup> and Ce<sup>3+</sup> ions.
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