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Title: Sol-gel routes to erbium doped waveguide amplifiers (EDWAs)
Author: Ali, Muhammad Irshad
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2009
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The potential of new erbium doped materials has been assessed with the aim of enhancing and tailoring the emission properties of ERIII ions (such as PL spectrum and lifetime) in pure and modified SiO2 hosts through sol-gel methodologies. The main focus has been to investigate potential use of novel precursor, erbium triflate, in combination with different organophosphorus ligands, and aluminium co-dopants, for the synthesis of sol-gel thin films, bulk and power materials. This thesis describes two main approaches. In the first approach, sols were synthesised using standard sol-gel hydrolysis and condensation process. This was followed by the deposition of thin films by spin coating. After the deposition the films were thermally treated at high temperature to produce compact inorganic SiO­2 networks. Finally, the optical characterisation of the films has been studied. The films were optically inactive. The second approach consisted of synthesis of sol-gel bulk materials in the form of glasses and glass ceramics co-doped with AlIII and PV ions, transparent glasses and glass ceramics incorporating ErIII ions concentration as high as ~10 mol % were prepared containing active nanocrystallites of erbium phosphate in amorphous SiO2 matrix. Optical characterisation of these glass ceramics has shown that broad and flat emission photoluminescence spectra of ErIII ions with FWHM greater than 100 nm are obtained only in the materials containing ErPO4 nanocrystals with average diameter of 4-5nm combined with a narrow and uniform size distribution. Visible upconversion was also detected in the Er-doped sol-gel SiO2 powders under excitation at 800 and 980 nm. Excited state absorption (ESA) and energy transfer up-conversion (ETU) have been discussed as possible mechanism for visible up-conversion.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available