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Open Access Nano Commentary

Photoluminescence emission of nanoporous anodic aluminum oxide films prepared in phosphoric acid

Abolghasem Nourmohammadi1*, Saeid Jalali Asadabadi1, Mohammad Hasan Yousefi2 and Majid Ghasemzadeh1

Author affiliations

1 Department of Physics, Faculty of Science, University of Isfahan, Isfahan, 81746-73441, Iran

2 Nanotechnology Research Group, Faculty of Applied Sciences, Malek-Ashtar University of Technology, Shahinshahr, Isfahan, 83145-34177, Iran

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Citation and License

Nanoscale Research Letters 2012, 7:689  doi:10.1186/1556-276X-7-689

Published: 29 December 2012

Abstract

The photoluminescence emission of nanoporous anodic aluminum oxide films formed in phosphoric acid is studied in order to explore their defect-based subband electronic structure. Different excitation wavelengths are used to identify most of the details of the subband states. The films are produced under different anodizing conditions to optimize their emission in the visible range. Scanning electron microscopy investigations confirm pore formation in the produced layers. Gaussian analysis of the emission data indicates that subband states change with anodizing parameters, and various point defects can be formed both in the bulk and on the surface of these nanoporous layers during anodizing.

Keywords:
Al2O3; Anodizing; Phosphoric acid; Oxygen vacancies; Luminescence