fig7
Figure 7. XPS spectra of α- (A) and β- (C) NaErF4@NaYF4 UCNPs before and after annealing at 200 °C for 4 h, crystalline structure of α- (B) and β- (D) NaREF4.
Figure 7. XPS spectra of α- (A) and β- (C) NaErF4@NaYF4 UCNPs before and after annealing at 200 °C for 4 h, crystalline structure of α- (B) and β- (D) NaREF4.
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