Amorphous and nanocrystalline ZrO

2

and ZrO

2

:Y(7%mol) were prepared by coprecipitated method

and their photoluminescence properties

sintering temperature and atmosphere dependence have been studied.The samples sintered at 300℃ had amorphous phase.At 900℃

they were crystallized into monoclinic phase and tetragonal phase for ZrO

2

and ZrO

2

:Y(7%mol) respectively.Luminescence intensity was influenced by the concentration of oxygen vacancies and grain size.Amorphous samples had stronger intensity than nanocrystalline samples.The emission spectra had an obviously broad band compared to that of single crystal sample and were not sensitivity to the phase of samples.They can be decomposed of a Gaussian band (2.69eV) and an asymmetry band (3.12eV).The intensity of asymmetry band decreased more than that of Gaussian band with increasing sintering temperature.The intensities of two bands of the sample prepared in reductive atmosphere were stronger than that of the sample prepared in oxidative atmosphere.Two kinds of color center F

+

center and (F-F)

+

center have been proposed as the emission center for the Gaussian band and the asymmetric band.