Nanocrystal formation and structure in oxyfluoride glass ceramics

The up-conversion luminescent property of the oxyfluoride glass ceramics 30SiO₂\cdot15Al₂O₃\cdot (50--x)PbF₂\cdot xCdF₂ doped with 4ErF₃\cdot1YbF₃ has been investigated. Up-conversion luminescent intensity of Er³⁺ ions increased obviously after heat-treatment due to co-doping with CdF₂. The structure model of nanocrystals Pb_xCd_1-xF₂ was determined and the effect of CdF₂ in oxyfluoride glass ceramics was explained by the analysis of x-ray diffraction data. Different nucleation temperatures of samples with different compositions were obtained by differential thermal analysis curves and the results showed the growth process of different nanocrystals in glass ceramics.