Photoluminescence properties of anodic aluminum oxide formed in a mixture of ammonium fluoride and oxalic acid

Shou-Yi Li; Jian Wang; Yan Li

doi:10.1117/1.OE.56.6.067107

14 June 2017 Photoluminescence properties of anodic aluminum oxide formed in a mixture of ammonium fluoride and oxalic acid

Shou-Yi Li, Jian Wang, Yan Li

Author Affiliations +

Optical Engineering, Vol. 56, Issue 6, 067107 (June 2017). https://doi.org/10.1117/1.OE.56.6.067107

Abstract

Highly ordered anodic aluminum oxide (AAO) membranes are fabricated electrochemically in an electrolyte mixture with various concentrations of C2H2O4 or NH4F. Photoluminescence (PL) properties of AAO membranes have been investigated before and after annealing in the range from 300°C to 650°C. X-ray diffraction reveals the amorphous nature of AAO membranes. Energy dispersive spectroscopy indicates the presence of fluorine species incorporated in oxide membranes during the anodizing. PL measurements show a strong PL band in the wavelength range of 350 to 550 nm. With the increase of the concentration of the NH4F or C2H2O4 in the electrolyte mixture, the peak positions of the PL bands have a blueshift or redshift and the intensities have a maximum value. As indicated by the PL excitation spectra, there are two excitation peaks of 285 and 330 nm, which can account for the PL emission band. We have proposed that the PL originates from optical transitions in two kinds of centers that are related to oxygen vacancies, F+ (285 nm) and F (330 nm). This work is not only beneficial to further understanding of the light-emitting property of AAO membranes but also enlarges the application scope.

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Shou-Yi Li, Jian Wang, and Yan Li "Photoluminescence properties of anodic aluminum oxide formed in a mixture of ammonium fluoride and oxalic acid," Optical Engineering 56(6), 067107 (14 June 2017). https://doi.org/10.1117/1.OE.56.6.067107

Received: 22 February 2017; Accepted: 25 May 2017; Published: 14 June 2017

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