Luminescent Er3+ doped transparent alumina ceramics

The photoluminescence spectra measured in both visible and NIR region showed typical emission bands due to the presence of Er3+ ions. The decay profiles of the 4S3/2 → 4I15/2 transition were fitted with a 2-exponential function, with faster component in the range of 360-700 ns and slower component around 1.6-2.4 μs. The intensity of emissions and lifetime of the 4S3/2 level decrease significantly with increasing concentration of Er3+ ions.