Fabrication and Luminescence of Anodic Alumina with Incorporated Vanadyl Citrate Chelate Anions

Anodic aluminum oxide doped with vanadyl citrate chelate complex anions was formed by a two-step self-organized anodization in 2 wt. % sulfuric acid containing 0.04 M V2O5 and 0.08 M citric acid at voltage range 13-23 V, and at 0 and 15 oC. The combination of two temperatures and at least four voltages (depending on the applied temperature) was applied as the operating conditions of anodization. It was found that formed nanoporous alumina was doped with vanadium (up to 0.08 at. %). The analysis of the photoluminescence of the grown oxide exhibits separate bands for the incorporated vanadyl citrate chelate anions (emission maxima at λ = 270 nm) and F – centers (emission maxima at λ = 455 nm). Moreover, due to the complex electronic structure of the incorporated anions, relatively long fluorescence decays were achieved (up to 44.6 ns). Despite incorporation of relatively large anions, pore diameter and interpore distance were still linear functions of the voltage. Conducted research allowed to understand the fundamental aspects of the anions incorporation in the anodic alumina and allowed to form a new type of luminescent material.
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