Abstract
Cathodoluminescence in the scanning electron microscope and photoluminescence in a confocal microscope have been used to investigate the luminescence properties of the stable monoclinic α-phase of Bi2O3. Powders of this oxide have been sintered at temperatures of 500°C and 750°C in air or in nitrogen atmospheres. Spectra of the starting powder and of the samples treated at 500°C show luminescence bands at 1.50eV and 1.95eV as well as a band at 2.1eV, more prominent in nitrogen treated samples. Sintering at 750°C leads to quenching of the 1.50eV infrared emission and the formation of a broad band with emission above 3eV. The evolution of Raman bands with the sintering treatments has also been investigated.
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