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Showing 1 to 16 of 16 for “"J-aggregates"”.
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Optoelectronic properties and energy transport processes in cylindrical J-aggregates
… solution to form tubular, double-walled J-aggregates. These J-aggregates have drawn comparisons to light harvesting systems, owing to their optical and structural similarities to the cylindrical chlorosomes (antenna) from green sulfur bacteria. This research utilizes optical spectroscopy …
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Superradiant Emission from Delocalized Frenkel Excitons in Molecular J-Aggregates
… excitations between chromophores in molecular J-aggregates leads to delocalized Frenkel excitons that span multiple molecules in the aggregate. Delocalized Frenkel excitons in molecular J-aggregates provide an avenue to access high-speed fluorescent materials with unique optical properties such …
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Structure and Application of Photosensitive Self-assembled Pseudoisocyanine J-aggregates on Membrane Surfaces
… membranes of living cells. Pseudoisocyanine J-aggregates were found to form on top of the heterogeneous lipid domains in a phospholipid bilayer. This behaviour is limited to a few headgroup chemistries and lateral packing motifs, allowing one to control aggregation via a combination of these …
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Nanocrystal/J-aggregate constructs : chemistry, energy transfer, and applications
… of materials, semiconductor nanocrystals and J-aggregates of cyanine dyes, have been developed chiefly due to their potential for interacting with light in interesting and productive ways. At the same time, existing spectroscopy and microscopy tools enable the study of these photonic materials, …
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Solid state cavity QED : practical applications of strong coupling of light and matter
J-aggregates of cyanine dyes are the excitonic materials of choice for realizing polariton devices that operate in strong coupling at room temperature. Since the earliest days of cavity QED, there has been a major desire to construct solid state optical devices that operate in the limit where …
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Efficient Föster energy transfer : from phosphorescent organic molecules to J-aggregate thin film
… but also electrically. However, since J aggregates are engineered for their optical and not electrical properties, exciting them electrically is very inefficient. JLED efficiency can be improved by first exciting phosphors that readily form excitons and then employing FRET to excite the J …
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Photostabilization of J-aggregate cyanine dyes for exciton-polariton based devices
… superfluids, and other exotic phenomena. Using J-aggregates, the aggregated form of cyanine organic dyes, we have previously fabricated light-emitting devices that demonstrated the first ever electrically pumped polariton emission, as well as critically coupled resonators with record high …
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Coherence in nanostructured excitons
… of artificial nanostructures: supramolecular J-aggregates and semiconductor quantum wells. In J-aggregate thin films I determined that coherence is controlled by thermal dephasing rather than film inhomogeneities, even at cryogenic temperatures. Tubular J-aggregates in solution undergo …
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Highly absorptive thin films for integrated photonic devices
… methods and applies them to thin films of J-aggregates grown in a layer-by-layer (LBL) process, which have been shown to have remarkable optical and morphological properties and have recently enabled the demonstration of strong coupling between light and matter in an electroluminescent device …
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SYNTHESIS AND CHARACTERIZATION OF NEW ORGANIC MOLECULES AND INORGANIC-ORGANIC HYBRID MATERIALS WITH INTERESTING LINEAR AND SECOND ORDER NON LINEAR OPTICAL PROPERTIES
… and it is related to the organization into J aggregates of the [DAMS+] chromophores. These materials are not only interesting for their SHG but also for the tuning of their magnetic properties by varying the MII/MIII couple. During the optimization of the synthesis of these compounds, a phase …
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Engineering J-aggregate cavity exciton-polariton devices
… In all of these areas, thin films of "Jelley aggregates," or J aggregates, offer a promising materials platform thanks to their narrow linewidth and high oscillator strength at room temperature, properties resulting from delocalization of excitations across multiple strongly-coupled molecules. …
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Coherent multi-exciton dynamics in semiconductor nanostructures via two-dimensional Fourier transform optical spectroscopy
… complexes, conjugated polymer systems, J-aggregates, and bulk or nanostructured semiconductors produce a hierarchy of collective electronic excitations (i.e. excitons, biexcitons, etc.) which may be harnessed for applications in quantum optics, light-harvesting, or quantum information …
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Indocyanine Green J-aggregate Nanoparticles for Detection of Senescent Cells
… First, in this thesis the synthesis of J-aggregates of indocyanine green was explored with the aim to develop a high contrast photoacoustic probe. Reported methods of J-aggregate productions resulted in poorly characterized systems, and the addition of centrifugation steps during the …
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Design and synthesis of conjugated macrocycles and polymers
… relationships. A brief general introduction to J-aggregates and conjugated polymers is given in Chapter 1, which represents two major areas that are dealt with throughout this thesis. Besides providing an overview of the basic principles, this introductory chapter will hopefully serve to give …
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Aggregation of Squaraine Dye Derivatives in Solid State Spin-coated Thin Films
… films. The study revealed the formation of J-aggregates with bands at 767 nm at room temperature. This aggregate was temperature dependent. It was transformed into H-aggregates as the temperature increased. The activation energy of the decay (transformation) process was found to be 91.2 kJ. …