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Optical properties of porous aluminum inlay composite

Author: DongYanFeng
Tutor: LiQingShan
School: Qufu Normal University
Course: Physical Electronics
Keywords: Porous aluminum Mosaic membrane Fluorescence spectroscopy Polarization
CLC: TB383
Type: Master's thesis
Year: 2002
Downloads: 80
Quote: 2
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Abstract


Porous anodic aluminum oxide prepared by electrochemical method (referred to as the porous aluminum) is a typical self-organizing materials, and has long been subject to the attention of the international scientific organizations. Present mainly as a template or host, growth of quantum wires, quantum dots and other nanomaterials. This thesis uses the array of very high porosity and nano porous aluminum structure, the organic light emitting material 8 - hydroxyquinoline aluminum (Alq 3 ) and Metal Cu, respectively, fill pores of the porous aluminum, researchers its optical properties. The first chapter is an overview of part of the porous aluminum. Focuses on the morphology of the porous aluminum, the formation mechanism of the preparation process as well as the preparation conditions (such as oxidation voltage, oxidation time, electrolyte concentration, temperature, etc.) porous aluminum prospect porous aluminum broad application prospects. The second chapter deals with the optical properties of the the porous aluminum inlay organic light-emitting materials, composite mosaic membrane fluorescence spectroscopy. The study found that the fluorescence spectrum and Alq was 3 spectral similarity in ethanol solution, rendering the light emitting characteristics of single molecules, and more symmetrical spectral shape. In addition, we also did a series of experiments investigated the preparation conditions on the Photoluminescence of organic mosaic membrane, quantity and degree of aggregation 3 molecules found in the spectra of porous aluminum embedding of Alq. When a large number of embedded molecules larger degree of aggregation, luminescence enhancement, red-shifted spectral peaks, but the degree of aggregation is too large, prone to the phenomenon of fluorescence quenching. In larger quantities, Alq 3 molecule are mostly combination of van der Waals forces, trimer less modest peaks mobile. Further, the porous structure of the porous aluminum, the organic molecules have a strong adsorption, so that most of the small organic molecules exist in monomeric form, resulting in Alq 3 emission peak is located in the porous aluminum around at 490nm than in solid powder state blue shift. The experiment, Alq was , 3 in the holes of the porous aluminum, substantially with the surrounding air, water vapor isolate, therefore stable optical properties. Experimental results show that, Alq 3 better luminescence properties in the porous aluminum organic mosaic membranes, porous media may become a further development of Alq 3 in electroluminescent devices a new way. Chapter polarization properties of metal-containing Cu nano-arrays porous aluminum. Metal Cu fill the holes of the porous aluminum electroplating method, the formation of metal Cu nanoparticles array. Drive electronics for power due the metal column Abstract block 2 parallel to each other, the electric field of the incident light wave along a direction component of the metal column, and the component is strongly absorbed and the basic right electronics for power in the direction component of the vertical metal columns, can be passed, Difficulties of this transmitted light through the film become a polarizing first. Was found that the copper-plated porous aluminum indeed exhibit the same like the wire-grid polarizer polarizing nature. Porous aluminum after the copper plating at the wavelength of 1. SPm have high transmittance and large extinction ratio. The polarization characteristics of the alumina before and after the copper plating compared and found that the degree of polarization of the porous aluminum after plating metal column so that after copper plating are significantly improved. The experiment also found that the polarization characteristics of the anode of platinum-plated porous aluminum oxide and plating conditions. As the current density increases, the increase in metal column, the optical loss is increased, the transmittance is decreased, and the degree of polarization increases. However, when the current density is increased to a certain value, the hole in the Joule heat can not be timely dissemination out, will result in the degree of ordering of the metal column is damaged, so the degree of polarization is lowered. Copper plating porous aluminum polarizer making simple, small size, has a very broad application prospects in the field of optoelectronic communications.

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