Research Article
Oxalic Acid-Assisted Hydrothermal Synthesis and Luminescent of Hexagonal NaYF4:Ln3+ (Ln = Sm, Eu, Yb/Er) Micro/Nanoplates
Figure 10
(a) Room temperature UC emission spectrum (Ex slits = 2 nm, Em slits = 5 nm) and (b) the CIE chromaticity diagram for the NaYF4:Yb3+/Er3+ samples.
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