Abstract
nanocrystals doped with ions in oxyfluoride glass ceramics were prepared by a solgel method. The structural properties were examined by x-ray diffraction measurements. The effects of gadolinium codoping on europium emission in the prepared solgel glasses and glass ceramics have been studied. The emission bands originating from the state of ions are enhanced under excitation of ions by 273 nm line. The electric dipole transitions were dominant in the samples before heat treatment, whereas magnetic dipole transitions had a higher probability in the samples after annealing. The luminescence lifetime for the level of ions in the samples after excitation at 273 nm is long lived in comparison to excitation at 393 nm and increased to 190%. Energy transfer from to was observed.
© 2014 Optical Society of America
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