Intense blue luminescence of anodic aluminum oxide

Effects of ordering quality of the pores on the photoluminescence of porous anodic alumina prepared in oxalic acid

“…The PL has been observed to emerge from two [27,32,33] to three excitation centers [34][35][36], although their attributions have been varying among various oxalate impurities, oxygen vacancies with one or two residing electrons (F + and F centers).…”

Blue photoluminescence of sponge-like highly porous alumina synthesized in hydrofluoric acid based electrolytes

“…It is to be noted that obtained values are in satisfactory agreement with each other in shown ± 0.05 eV scatter. It is known that luminescence centers of AAO synthesized in (COOH) 2 are complexes based on oxygen vacancies and/or oxalate-ions impurities formed during oxidation process [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Electrolyte composition in current work excluded presence of oxalate-ions.…”

“…Numerous studies considering luminescent properties of anodic aluminum oxide synthesized in electrolytes of various type and composition have been conducted up to date [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The most intensive emission with maximum in 430 -500 nm range was demonstrated by amorphous as-grown nanostructures anodized in oxalic acid based solutions [6][7][8][9].…”

“…The most intensive emission with maximum in 430 -500 nm range was demonstrated by amorphous as-grown nanostructures anodized in oxalic acid based solutions [6][7][8][9]. A major contribution in mechanisms of observed luminescence were made by defects attributed to oxygen vacancies in different charge state [7,[10][11][12][13][14][15][16][17][18] and/or oxalate-ions impurities [8,9,[19][20][21][22]. Therefore, it is of current interest to search for optimal anodizing modes and electrolytes composition in order to obtain nanostructured oxide layers with high concentration of optically active defects formed due to developed surface with big specific area.…”

Nanoporous Anodic Aluminum Oxide: Fabrication, Characterization, and Applications

“…The peaks of the PL emission caused by the presence of the F-centers have their maxima at wavelengths ranging from 390 to 500 nm (Table 1 [ 214,116,135,178], ). These bands, together with the ones originating from incorporated anionic species, form broad PL bands.…”