Visible luminescence from europium-doped alumina sol-gel-derived films confined in porous anodic alumina

摘要

In this work, we report on strong photoluminescence (PL) of europium-doped alumina sol-gel-derived films fabricated onto porous anodic alumina of 30 mu m thickness. The PL spectra represent a set of peaks typical for Eu~(3+) ions with the maximum at 617 nm. PL intensity was found to increase with increase of Eu content in xerogel. Cooling the samples from 300 to 10 K leads to an increase in PL intensity. Eu PL increases nearly linearly with the excitation power within a range up to 25 mW/cm~2. Red Eu-related PL from all of the samples is visible to the naked eye even at room temperature.