Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Photophysical Studies"”.
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Photophysical Studies of Active Layer Compositions in Organic Solar Cells
… a particular type of CT state. Morphological and photophysical techniques are used to rationalise changes in device performance following encapsulation. Macrocyclic molecules are also explored as a method to control packing and we apply this to the acceptor component of the active layer. The …
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Syntheses and Photophysical Studies of Two-Dimensional Hybrid Organic-Inorganic Semiconductors
This thesis focuses on the studies of two families of two-dimensional (2D) hybrid organic-inorganic semiconductors with exciting properties for optoelectronic applications. The first family is 2D lead halide perovskites (LHPs), which have received immense interest due to their solution …
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Photophysical Studies of Beta Phase Formation in Poly(9,9-di-n-alkylfluorenes)
The photophysical changes that take place in Poly(9,9-di-n-alkylfluorenes) upon formation of the beta phase in methylcyclohexane solution are observed by optical spectroscopy. The equilibrium absorption spectra as a function of temperature show that conformational changes occur for all five …
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Photoelectrochemical and photophysical studies of carbon nanotube and molybdenum disulfide based light harvesting devices
… designs, (ii) understanding their fundamental photophysical and photoelectrochemical properties, and (iii) providing potential solutions to improve the system performance.</p> <p>First, novel light-harvesting complexes were designed using semiconducting SWCNTs and cationic porphyrins as …
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Multimetallic Supramolecular Complexes: Synthesis, Characterization, Photophysical Studies and Applications in Solar Energy Utilization and Photodynamic Therapy
… fingerprint features of complex supramolecules. Photophysical measurements include emission spectroscopy with quantum yield measurements and emission lifetime measurements. Photophysical data provided detailed information to aid in developing an understanding of excited state properties of these …
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Photophysical studies of silver(I), platinum(II), palladium(II), and nickel(II) complexes and their use in electronic devices.
… with two major topics that involve spectroscopic studies of (a) divalent group 10 metals and (b) silver(I)-phosphine complexes. The scope of the work involved the delineation of the electronic structure of these complexes in different environments and their use in electronic devices. The first …
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Synthesis and Spectroscopic Studies of Substituted Pyrrolocytidines
… yield the bicyclic nucleoside pyrrolocytidine. Photophysical studies were performed to determine possible FRET pairs to be used as molecular beacons and Stern-Volmer plots were used to determine how effective each quencher was at reducing the fluorescence intensity of the fluorophores. The molar …
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Synthesis and characterization of various ruthenium small molecules and metallopolymers for potential use in photovoltaic devices and luminescence properties of N-heterocyclic carbenes and trifluoro methylated tris(pyrazolyl)borate silver (I) acid-base adducts
… active materials. The second chapter includes photophysical studies of different metallo N-heterocyclic carbenes and acid-base adducts comprising fluorinated tris(pyrazolyl)borate silver(I) complexes coordinated to different solvent and aromatic molecules. These species have been investigated …
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Control of Excitons and Quantum Emitters in Two-Dimensional Materials
… the emission energy of quantum emitters in hBN. Photophysical studies at cryogenic temperature show the coupling efficiency of different phonon modes to the quantum emitters in hBN, and a correlation between the local strain and localized exciton energy in TMDs. In addition, a strain gradient …
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New Luminescent Organic and Organomatallic Materials for OLED Applications
… host polymer was synthesised and characterised. Photophysical studies and device data are presented. The triplet energy of this polymer is 2.73 eV. Also, the unoptimised device efficiency (device architecture: ITO/PEDOT:PSS/8% 145 and 40 wt% OXD-7 doped in polymer 133/Ba:Al) is 4.5 cd/A. Our …
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Design, Synthesis, Photochemical and Biological Evaluation of Novel Photoactive Molecular Switches
… isomerism. Specifically, it is evaluated their photophysical and photochemical properties, and how they can be tuned by slight modifications in their structure. Moreover, the off/on photoactivation of the cytotoxicity was achieved, allowing us to localize the cytotoxic action in a specific part …
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EXPLORATION AND MECHANISTIC STUDY OF WEAKLY COORDINATING ANIONS UNDER THERMAL AND PHOTOCHEMICAL CONDITIONS FOR SELECTIVE TRANSFORMATIONS OF C-C MULTIPLE BONDS
… alkyne hydration reaction was developed. Studies on the roles of solvents, temperature, and substrate into the mechanism were accomplished through rate and kinetic isotope effect experiments. In the third chapter, a series of ion pairs in metal-based systems featuring [Ru(bipyridine)3]2+ …
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Synthesis and Characterization of Red and Near-Infrared BODIPY-based fluorophores for various Biological Applications
… The effects of the styryl substituents on their photophysical properties and in vitro photodynamic activities are also described. Chapter 4 discusses an efficient method towards the preparation of a series of BODIPY-PEG and BODIPY-Carbohydrate conjugates via Cu(I)-mediated azide/alkyne …
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Photoconductivity studies of the ferrocyanide ion under high pressure
… discusses the wide range of photochemical and photophysical studies to which the photoconductivity apparatus described here, using high-power pulsed laser excitation, is ideally suited.
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DENSITY FUNCTIONAL THEORY STUDIES OF PHOTOINDUCED ELECTRON EXCITATION AND TRANSFER OF ORGANIC DYES FOR PHOTODYNAMIC THERAPY, SOLAR CELLS, AND FLUORESCENCE SENSOR APPLICATIONS
… main aim of work presented here is to understand photophysical processes of organic dyes and to design better organic molecules/systems which can be applied in many applications such as solar cells, photodynamic therapy, and fluorescence sensors. Developments of novel multichromophore organic …
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New Polyazine-Bridged Ru(II),Rh(III) and Ru(II),Rh(I) Supramolecular Photocatalysts for Water Reduction to Hydrogen Applicable for Solar Energy Conversion and Mechanistic Investigation of the Photocatalytic Cycle
… supramolecular complexes. Electrochemical studies suggested that replacing bpy with a tridentate ligand on RhIII shifts the RhIII/II and RhII/I reduction couples positively, which can modulate the orbital energetics of the RhIII LUMO (lowest-unoccupied molecular orbital). This substitute …
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Design and synthesis of organic chromophores for imaging, lithography and organic electronics
… in degassed acetonitrile solutions. Mechanistic photophysical studies indicated that the photoreduction of RDX proceeded via a two-step electron-hydrogen atom transfer reaction, whereas PETN photoreduction proceeded via a threestep electron-proton-electron transfer sequence. A zinc analog was …
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