Abstract
We studied the generation of electroluminescence (EL) of pure aluminum and aluminum oxide (Al2O3) formed in distilled water in esters of carboxylic and dicarboxylic acids (ethyl acetate, diethyl oxalate, diethyl malonate, diethyl phthalate, and dibutyl phthalate) and ketones, lactams, and diketones (acetone, cyclohexanone, 4-ethylpropiophenone, acetylacetone, and methylpyrrolidone). No electroluminescence in pure aluminum in esters was revealed, and the regularities of luminescence generation in them for the oxidized metal were found. In ketones and related compounds (lactams and diketones), electroluminescence may occur for both states of the aluminum anode. The electroluminescence spectra have broad bands in the range of 400–700 nm with maxima characteristic of the carboxyl and carbonyl groups of the electrolytes used and the nanoporous structure of the formed Al2O3 and carbon-containing impurities captured by it during the growth. In some esters and ketones, we found the effect of transformation of the initial structure of the oxide and an increase in its thickness. The absence of any changes in the chemical composition of electrolytes after anodic oxidation of aluminum in them or transformation of Al2O3 was proved by UV, IR, and NMR spectroscopy.
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The study was supported by the Russian Foundation for Basic Research within the framework of scientific project no. 19-32-90112.
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Ovechenko, D.S., Boychenko, A.P. & Yakovenko, N.A. Features of Electroluminescence of Aluminum and Its Nanoporous Oxide in Esters and Ketones. Opt. Spectrosc. 129, 969–978 (2021). https://doi.org/10.1134/S0030400X21070134
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DOI: https://doi.org/10.1134/S0030400X21070134