[Photoluminescence of tetragonal ZrO2 nanoparticles synthesized by severral methods].

Five methods for the preparation of stabilized ZrO2 nano-powders have been used. They are hydro-thermal method, alcohol-thermal method, sol-gel method, microwave-irradiation, and sonochemical method. XRD (X-ray diffraction) and PLspectra (Photoluminescence spectra) have been utilized to characterize these samples. Stable tetragonal nanometre ZrQ powders have been synthesized by these methods. From the XRD pattern, it is clear that the ZrO2 samples we obtained are crystal and distributed well. The PL pattern shows that the nano-ZrO2 powders can emit clear red and blue light when they are excited by the ultraviolet. The emphasis of this thesis is to discuss the ZrO2 emission nanocrystals' luminescent procedures.