Monodispersed nanocrystalline fluoroperovskite up-conversion phosphors

A series of monodispersed fluoroperovskite nanocrystals with the size 20 nm were synthesized and rare earth doped. A series of KMF3:Yb3+ Er3+ (M = Mn, Zn, Cd, or Mg) up-conversion phosphor nanocrystals were synthesized. The emissions can be directly observed using the naked eye. Different red-to-green luminescent ratios for different host materials were discussed. Powder X-ray diffraction, transmission electron microscopy, and luminescence spectroscopy were used to characterize the products. The up-conversion mechanism was discussed.