Photoluminescence emission of nanoporous anodic aluminum oxide films prepared in phosphoric acid
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
Nanoscale Research Letters 2012, 7:689 doi:10.1186/1556-276X-7-689Published: 29 December 2012
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.