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 21 for “"excited state lifetimes"”.
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LINEAR AND NONLINEAR FLUORESCENCE LIFETIME IMAGING FOR BIOSENSING APPLICATIONS
… spatial distribution of picosecond to nanosecond excited state lifetimes within microscopic images. In this work, FLIM technique combined with Time Correlated Single Photon Counting (TCPSC) Technology was used to develop several novel biosensing approaches. Using linear or nonlinear excitation …
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Modification of Excited State Behavior with Ligand Substitution in Ru(II),Rh(III) Bimetallic Supramolecular Complexes
… photophysical properties of the molecule. The excited state lifetime of the complex with a dcmbpy terminal ligand was 93 ns while the excited state lifetimes of the complexes with a bpy or Me₂bpy terminal ligand were 44 ns and 47 ns, respectively. Ligand substitution was shown to influence the …
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Spectroscopic Studies of Inclusion Host-Guest Complexes Between Cyclophane Corrals and Polcyclic Aromatic Hydrocarbons
… effect of the complexes in the condensed phase. Excited state lifetimes of these systems are also determined, and they support fluorescence as a path of relaxing back to the ground state.
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Molecules and materials for the optical detection of explosives and toxic chemicals
… spectra, large Stokes Shifts, as well as long excited state lifetimes.
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Synthesis and Photophysics of Varied Substituted DPNDs for Potential PDT Applications
… architecture and solvent polarity govern excited-state dynamics is fundamental to developing functional chromophores for photo-energy conversion and manipulation for opto-electronic applications. Here, the photophysical properties of three dipyrrolonaphthyridinedione (DPND) derivatives, …
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Experimental investigation of a catalyst under various solar light conditions for hydrogen production.
… between photon supply rate and molecular excited state lifetimes on photocatalytic ability.
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Optimizing the excited state processes of conjugated polymers for improved sensory response
… by integrating chromophores with long-lived excited states into the polymer backbone. The first chromophore we targeted, triphenylene, has a symmetrically-forbidden ground state transition, resulting in a long excited state lifetime. Chapter 2 describes the synthetic incorporation of …
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Building model systems to understand Proton-Coupled Electron Transfer in heme : spectroscopic investigation of charge transfer to axially bound diimide acceptors
… study of the formation of the oxidation states of heme, of particular interest the highly reactive Fe(IV)=O species. The bidirectional model is prepared using a hangman porphyrin with an axially coordinated to the metal center, and the electron transfer event is triggered by excitation of …
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Novel Iridium (III) complexes for photocatalytic H2 generation from H2O using sunlight
… quantum efficiency, (3) very large values for excited state lifetimes, (4) facile colour tuning through ligand structure control and (5) large cross section for exciton formation. Such characterstic features are attributed to the efficient spin-orbit coupling provided by the Ir metal as well as …
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Ultrafast and Nonlinear Spectroscopy of Colloidal Nanomaterials
… is also used to investigate the ultrafast excited-state relaxation dynamics of the different dyes adsorbed on the core-shell-shell surface and the size-dependent dynamics o interfacial charge transfer between the gold nanoclusters and the TiO2 bandgap in TiO2-Au nanocomposites. In the …
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Molecular dynamics studies of the protein bacteriorhodopsin
… distinguished by the retinal isomeric state and the orientation of the Schiff base proton relative to nearby water molecules and negatively charged aspartic acids. One particular photoproduct is suggested to lead to successful proton pump activity, while the remaining structures return …
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Ultrafast extreme ultraviolet spectroscopy of transition metal dithiolate coordination complexes
… of a ligand-to-metal charge transfer (LMCT) excited state whose spin can be determined by comparison to semi-empirical ligand field multiplet calculations. The combination of optical and x-ray techniques is crucial to identifying relaxation processes that affect predominantly either the metal …
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Transient Photophysics of Bismuth Halide Semiconductors for Optoelectronic Applications
… based on the detection of mid-gap electronic states in the transient absorption spectra. Coherent phonon transients are also measured on ultrafast timescales showing strong electron-phonon coupling in the material, which may contribute to the slow recombination in this material. The …
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Luminescent Lanthanide Complexes and Nanoparticles for Biological Applications
… applications because of their long emission lifetimes, sharp emission bands, color purity, resistance to photobleaching, and enhanced signal-to-noise ratios. Their practical use in aqueous and biological systems requires organic chromophores or other organic ligands that provide water …
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From Dye Sensitized Solar Cells to Organic Field Effect Transistors: A Computational Investigation into the Structural and Electronic Properties of Novel Phthalocyanines
… also introduce several partially occupied states near the top of the Pc valence band, which have electron density localized on the metal center.</p> <p>The bulky groups on the periphery of the Pc also act to mitigate molecular aggregation. To access the degree of aggregation as a function …
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Investigation of the Photophysical Properties of pi-Conjugated Polymers. A Study by Non-Linear, Time-Resolved, and Single-Molecule Spectroscopy
… wave functions of the lowest electronically excited singlet states were studied. It was found that the symmetry selection rules for optical transitions are rather strictly fulfilled, demonstrating the high intra-chain order in MeLPPP. Additionally, these data gave evidence that the energies …
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Shape and Structure of Neutron-Rich from Cf-252 Fission Fragments
… covered the 6 to 16ћ spin range of the ground-state band and at least a strong transition in the γ band. At moderate spin, the Q<sub>t</sub> moments are found to be reduced with respect to the values near the ground states, the latter being reported in the literature.</p><p>An attempt has been …
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Anisotropic surface functionalization and applications of upconversion nanoparticles
… large anti-Stokes shift, sharp emission and long excited-state lifetimes. The controlled synthesis of their heterogeneous nanostructures can create different morphologies with different properties. This makes it possible to use these particles to perform biomolecular assays, multi-scale and …
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Design and Synthesis of Mixed-Metal Supramolecular Complexes Incorporating Specialized Light Absorbing Units to Investigate Processes Relevant to Catalyst Function
… light absorbing units to probe perturbation of excited-state properties by ligand deuteration and long-term complex stability via racemization of initially enantiopure light absorbing subunits. Varying bidentate polypyridyl terminal ligands (TL), bridging ligands (BL), reactive metal center …
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