FLUORESCENCE ASSOCIATED WITH IMPURITIES IN NANOSTRUCTURED AL2O3

The fluorescent spectra of nanostructured Al2O3 after heat-treating at different temperatures have been systematically investigated. The res ults show that for eta-Al2O3 and gamma-Al2O3, two broad fluorescent ba nds P-1 and P-2 appear in the wavenumber range of 20000 cm(-1) to 1150 0 cm(-1) and P-1 and P-2 bands are located in the wavenumber range of 20000 cm(-1) to 14500 cm(-1) and 14500 cm(-1) to 11500 cm(-1), respect ively. The P-1 band can be attributed to the impurity Cr3+ luminescenc e. This is consistent with other author's result for the Cr doped Al2O 3. The P-2 band is a new fluorescent phenomenon, which has not been re ported previously. In this paper, the condition of the appearance of P -2 and its mechanism is discussed in detail.