Abstract
Up-conversion properties of Yb3+/Er3+ co-doped LiYF4 nanocrystals embedded in a sol–gel derived oxyfluoride glass-ceramic have been studied by comparison to the corresponding polycrystalline sample. Under 980nm laser light pumping, both Yb3+/Er3+ co-doped LiYF4 samples show green ((2H11/2, 4S3/2)→4I15/2) and red (4F9/2→4I15/2) up-conversion luminescences explained by a two-photon processes. The tendency for the saturation of the red up-conversion luminescence band observed in the glass ceramic was ascribed to a back energy transfer process Er3+–Yb3+ and cross-relaxation processes caused by the high Yb3+ and Er3+ ions concentrations in the nanocrystals.
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