Effect of Thermal and Mechanical Treatments on the Cathodoluminescence of Tin and Titanium Oxides

摘要

The luminescence of titanium oxide and tin oxide has been investigated by cathodoluminescence in the SEM,as a function of the structural changes induced by thermal treatments.The evolution of the luminescence of TiO_2 rutile,anatase and mixture phase with the annealing temperature is related to the process of thermal induced gain texture and to transition of metastable phases to the stable rutile.The emission band is peaked at 480 nm for the composite phase and at 580 nm for anatase and rutile phases respectively.A broad band in the 520-560 nm region is present in the spectra of both anatase and rutile phase.Thermal annealing leads to a red shift of the luminescence emission,with the emission band peaked at around 820 nm.In sintered tin oxide the man emission bands appear centered at about 480 nm and 630 nm.