Synthesis and Characterization of KMnF3:Yb/Er@KMnF3 Upconversion Luminescent Nanocrystals.

A hydrothermal method has been developed for preparation of monodispersed and flake KMnF3 upconversion luminescent nanocrystals doped with Yb3+ and Er3+. The prepared nanocystals materials were characterized by XRD, EDX, SEM and TEM. The upconversion emission spectra show that the KMnF3:Yb/Er nanocrystals has a single-narrow-band emission centered at 660 nm. This is the firstly reported hydrothermal procedure for synthesis of the flake KMnF3 nanocrystals with single-narrow-band upconversion luminescence. Furthermore, a core-shell structure was introduced to synthesize the KMnF3:Yb/Er@KMnF3 nanocrystals and higher luminescence intensity was obtained.