Cathodoluminescence of TiO_2 Powders

摘要

Cathodoluminescence (CL) of titanium dioxide powder at 87 K was investigated and bands at 265, 275, 490, 515, 815, and 1080 nm were recorded. The maximum at 590 nm was found on the long wavelength wing of the 515 nm band. The bands in the visible region of the spectrum are the most intense. The band assignments are suggested. The band at 1080 nm was recorded for the first time and its nature is unknown. Irradiation with accelerated electrons results in the decrease in the band intensities. The increase in the 815 nm band intensity was observed at the beginning of irradiation. The luminescence enhancement is explained by the cleaning of the powder surface with the electron beam, and the decline is explained by the concentration quenching on radiation defects.