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Showing 1 to 16 of 16 for “"Rubrene"”.
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The effects of strain on the electronic and optical properties of rubrene single crystals
… altering molecular structure. With this in mind rubrene was chosen as a model system due to the ease of growing high quality single crystals and a host of desirable properties including air and light stability, high mobility, bright luminescence and, crucially, flexibility. The outset of this …
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Infrared-to-visible upconversion in hybrid thin films of colloidal nanocrystals and organic molecules
… colloidal nanocrystals (NCs) and a thin film of rubrene mixed with emissive DBP molecules. Upconversion is realized via triplet-triplet annihilation (TTA) in rubrene sensitized by the NCs. We demonstrate that compared to the previous all-molecular upconverting systems, the use of inorganic NCs …
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Single-crystal growth of organic semiconductors and organic electronic applications
… In Chapter 3, organic single crystal FET of rubrene was studied. Graphene was used as an organic electrode instead of conventional gold film. Graphene is a sp2-hybridized carbon crystal which has high conductivity with negligible thickness. These factors are advantageous in organic FET as the …
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Spin injection and manipulation in organic semiconductors
… the ferromagnet and the organic semiconductor, rubrene. This is performed in a vertical organic junction geometry using different interface characterization tools. The growth morphology of the rubrene molecule is shown to influence the electronic coupling between the molecule and the …
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Fluctuations and exciton dynamics in molecular semiconductors
… describes the observed exciton dynamics in rubrene and tetracene single crystals, where singlet exciton fission is endothermic. We find that the momentum maps in tetracene are highly similar to those of the structural cousin pentacene. However, the dynamics differ substantially. We …
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Single layer graphene as a stable and transparent electrode for the measurement of non-aqueous electrogenerated chemiluminescence and charge transfer inverse photoemission
… SLG was used with classical ECL luminophores, rubrene, tris(2,2′-bypyridine)-ruthenium(II) and 9,10-diphenylanthracene in an inert environment to generate stable electrochemical responses and measure light emission through the material. SLG displayed excellent stability during electrochemical …
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Modeling non-radiative processes in solar materials
… triplet energy between a quantum dot and rubrene phase are found to have varying impacts on the total transfer efficiency based on the triplet lifetime of the anthracene derivative. Most potently, significant spin-orbit coupling in some of the derivatives causes substantial deactivation. …
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Structural Characterization of Thin Films of Molecules on Solid Surfaces: Development of a Portable UHV Chamber to Bridge RHEED and SFG Spectroscopy Techniques
… a combined study using RHEED and SFG on rubrene single crystals and a temperature-dependent SFG study in a high-vacuum cell are two other case studies in this thesis. In summary, this work enables a vast possibility of future experiments to investigate structures of thin films, their …
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Engineering the optical properties of luminescent solar concentrators at the molecular scale
… transport in crystalline tetracene (Tc) and rubrene (Rb). A timeresolved imaging technique that maps the triplet distribution showed that optical waveguiding dominates over diffusion and can transport energy several micrometers at the high excitation rates commonly used to probe the exciton …
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Spectroscopic Measurements of Doping and Strain at Two-Dimensional Material Interfaces
… photoemission experiments were carried out on rubrene single crystal samples. These results demonstrate the feasibility of TR-2PPE experiments using this experimental apparatus. Possibilities for improvements in the experimental methods are identified.
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Probing Spin in Organic Semiconductors via Magnetic Resonance
… systems rather than amorphous polymers. In rubrene --- a model system for organic field-effect transistors --- we report microsecond-long relaxation times from 15 K all the way to room temperature. In the framework of the relaxation theory developed in Chapter 2, we show how such long and …
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Excitonic spin engineering in optoelectronic devices
… colloidal nanocrystals as the sensitizer and rubrene as the annihilator. The use of colloidal nanocrystals as the sensitizer allows us to minimize energetic loss and extend deeper into the infrared as compared to state of the art devices, while allowing for facile construction of a solid state …
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Influence of the Matrix Environment on the Optical Properties of Incorporated Dye Molecules
… -2-methyl-6-(p-dimethylaminostyril)-4H-pyran) and rubrene (5,6,11,12-tetraphenyl-naphthacene) molecules in the optically active Alq3 matrix. The observed enhancement of luminescence intensity and alteration of emitted color are favorable for application of the doped Alq3 films as converter layers …
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Understanding transport processes of organic semiconductors via magnetic resonance methods
… the field-induced ESR methods to triclinic phase rubrene- a bench-marking organic molecular crystals – with p-type doping, to examine the spin relaxation dynamics of the induced carriers. Chapter 4 reports continuous-wave electrical-detected magnetic resonance measurement to organic field-effect …
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Sensitized energy transfer for organic solar cells, optical solar concentrators, and solar pumped lasers
… of thin film singlet fission sensitizer (rubrene) for high efficiency organic solar cells. To reduce the cost of electricity generated by sunlight via LSC systems, replacing the expensive high efficiency visible photovoltaic (PV) elements with cheap, high efficiency, earth abundant …