Microstructures and luminescent properties of Ce-doped transparent mica glass-ceramics

摘要

Transparent mica glass-ceramics were prepared by heating parent glasses that had been doped with 0.5-15 mol % CeO_2. During the melting and heat treatment, Ce~(4+) ions in the specimens were reduced to Ce~(3+) ions, and one or both of these ion species were then replaced with Li~+ ions in the interlayers of the separated mica crystals. However, scanning transmission electron microscope (STEM) and Z-contrast imaging revealed that the mica crystals did not contain the same amount of Ce. On excitation at 254 nm, the parent glasses and glass-ceramics emitted blue light, which originated from the 5d to 4f transition of the Ce~(3+) ions. The emission of the glass-ceramic containing a smaller amount of Ce was attributed to the Ce~(3+) ions in both the glass phase and the mica crystals, whereas that of the glass-ceramics containing a larger amount of Ce was caused mainly by Ce~(3+) ions in the mica crystals. The dependence of the emission band of the parent glasses on the amount of Ce was a unique feature of the Ce-doped transparent mica glass-ceramics and was not observed in previous studies of Eu-doped parent glasses and mica glass-ceramics.