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A series of monodispersed fluoroperovskite nanocrystals with the size 20 nm were synthesized and rare earth doped. A series of KMF 3:Yb 3+,Er 3+(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. [ABSTRACT FROM AUTHOR]

Eu3+-doped silicate phosphors are prepared hydrothermally. The effects of mineralizer, concentration, source materials, reaction time, and temperature were are studied. X-ray diffraction and scanning electron microscopy were applied to characterize the phase and morphology of the products. Thermo stability was evaluated by thermal gravimetric analysis and differential scanning calorimetry analysis. Photoluminescence spectroscopy was used to study the luminescent properties. [ABSTRACT FROM AUTHOR]