Optical and structural properties of sol-gel derived materials embedded in porous anodic alumina

Structure composing a xerogel, doped with lanthanide ions (erbium, terbium and europium), embedded in porous anodic alumina (PAA) have been fabricated and their optical and electrical characterisitics have been studied. Erbium photoluminescence at 1.53 µm from titania xerogel/PAA was found to increase with the number of xerogel layers and erbium concnetration for the excitation wavelength 532 nm, matching the area of transparency of both titania xerogel and PAA. Visible green and red electroluminescence was observed for terbium- and europium-doped IN2O3 and SnO2 xerogels embedded in porous anodic alumina. The improvement of the electrical properties of the xerogel/PAA cell is discussed, taking into account the observed ability of conducting In2O3:Sn (ITO) nanoparticles to penetrate into the anodic alumina pores

Luminescent imaging on the basis of porous anodic alumina

Recently it was demonstrated that growth of porous anodic alumina (PAA) and sol-gel synthesis allow fabrication of luminescent images that exhibit room temperature green and red coloured lightening under UV excitation. Here, the possibilities of tailoring PAA growth and consequent application of xerogels and highly luminescent quantum dots are described aimed at the generation of multicolour luminescent images. Blue photoluminescence, originating from the PAA, grown under selected conditions, is reported.</p

Luminescence from europium and erbium doped yttrium aluminium garnets fabricated in porous anodic alumina membranes

We report on sol-gel synthesis of Eu- and Er-doped garnets in porous anodic alumina, revealing the strong luminescence in visible and near 1R ranges associated with the 4I13/2 →4[ 15/2 and 5D0 →7Fj (j=l, 2,3, 4) transitions of trivalent Er and Eu ions, respectively.</p