HOPE, ADAM,JOHN (2014) FLUORINATED EMITTER MOLECULES FOR TRIPLET-TRIPLET ANNIHILATION UP-CONVERSION MEDIA. Doctoral thesis, Durham University.
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This thesis details the synthesis, characterisation and photophysical properties of various fluorinated emitters for triplet-triplet annhilation up-conversion systems. The theory and mechanism of TTAUC is evaluated and the molecular design of the annihilating emitter molecule reviewed to allow improvement of the external up-conversion quantum yield and overall energy efficiency of the process.
Three main series of chromaphores were investigated, based on diphenylanthracenes,
bisphenylperylenes, and 3,5,8-triphenylBODIPYs. These were synthesised by metal catalysed aryl-aryl coupling (Suzuki-Miyaura) or nucleophilic substitution reactions and, when paired with appropriate sensitizing molecules, allowed the up-conversion of green to blue; red to green; and near IR/red to orange respectively.
The effect of increasing fluorination on the ease of synthesis and photophysical properties of these emitter systems was studied with a view to their application in up-conversion systems. Fluorinated emitter molecules were shown to be highly resistant to degradation by UV light compared to their non-fluorinated analogues.
The up-conversion ability of these systems was evaluated and novel fluorinated BODIPY based dyes were produced that have high fluorescence quantum yields of over 90%. Finally the up-conversion of up-converting nanoparticles incorporating fluorinated emitters was evaluated.
|Item Type:||Thesis (Doctoral)|
|Award:||Doctor of Philosophy|
|Keywords:||Up-conversion, Upconversion, BODIPY, Anthracene, Perylene, Sensitized Emission, Solar Polar, Photovoltaics, Triplet, Annihilation, Nanoparticles|
|Faculty and Department:||Faculty of Science > Chemistry, Department of|
|Copyright:||Copyright of this thesis is held by the author|
|Deposited On:||28 May 2014 11:42|