Impact of Ce4+ ion on microstructure and luminescence character of Ho3+/Yb3+ co-doped ZrO2 nanocrystal

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“…Broad absorption bands could also be observed in the region between 320 nm and 450 nm ( Figure 2 d), corresponding to the charge transfer leap from Ce 4+ to O 2- that occurs in CeO 2 [ 43 ]. The Raman spectrum ( Figure 1 g) displays a strong characteristic peak of CeO 2 at 462 nm [ 44 ], after the reaction of CNDs and H 2 O 2 . Before the reaction with H 2 O 2 , the CNDs did not have the corresponding Ce 4+ Raman peak, from which it could be concluded that the content of CeO 2 in the CNDs was extremely low before the reaction ( Figure 1 g).…”