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 “"J-aggregate"”.
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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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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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Indocyanine Green J-aggregate Nanoparticles for Detection of Senescent Cells
… and validated the first of its kind J-aggregate nanoparticle, exhibiting fluorescent and photoacoustic imaging properties for longitudinal *in vivo* bioimaging of senescence. First, in this thesis the synthesis of J-aggregates of indocyanine green was explored with the aim to develop a …
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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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Electrically pumped polariton emission in a J-aggregate organic light emitting device
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Efficient Föster energy transfer : from phosphorescent organic molecules to J-aggregate thin film
… quantum efficiency of a electrically pumped J-aggregate light emitting device (JLED). J-aggregate thin films are highly absorptive films that have potential applications in a new class of optoelectronic devices, known as polaritonic devices. These devices, which utilize strong coupling between …
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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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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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NONLINEAR AND ULTRAFAST OPTICAL STUDIES OF INTERFACIAL PROCESSES IN PHOTOVOLTAIC NANOMATERIALS
… excited state exciton dynamics of a porphyrin J-aggregate are investigated and subsequently modeled. More rapid dynamics are found following aggregation of the porphyrin, which can be attributed to the inclusion of more efficient relaxation channels. However, no electron injection from the …
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Single and multi-exciton dynamics in nanoscale semiconductors
… to study three semiconductors: double-walled J-aggregate nanotubes, cuprous oxide, and monolayer transition metal dichalcogenides. First, we use two-dimensional correlation spectroscopy and cryogenic tunneling electron microscopy to correlate the excitonic and structural properties of …
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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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Structure and Application of Photosensitive Self-assembled Pseudoisocyanine J-aggregates on Membrane Surfaces
… objective of this thesis is to understand the aggregate size, packing, and monomer orientation for the cationic dye, pseudoisocyanine. These organic molecules assemble into crystals in solution, on planar bilayer templates, and on the membranes of living cells. Pseudoisocyanine J-aggregates …
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Design and synthesis of nanocrystal heterostructures for optoelectronic applications
… nanocrystal heterostructures formed using J-aggregate dyes electrostatically bound to QDs, have shown potential for use in LCD or lasing device applications.
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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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DIRECT REAL-TIME REAL-SPACE IMAGING OF ENERGY TRANSPORT IN ORGANIC SEMI-CONDUCTORS
… dynamics in two systems: a nanotubular J-aggregate formed from the self-assembly of molecular pseudoisocyanine (PIC), and a lateral heterojunction formed between a perylene diimide (PDI) and pentacene. Through femtosecond transient absorption microscopy (with sub-10 fs temporal and sub-10 …
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Capture and control of excitations
… For signal concentrators, this is a mutli-aggregate fluorophore with <100 ps fluorescence lifetime that does not re-absorb its own emission because of the introduction of an artificial Stokes' shift. In addition, in this thesis I model the photophysical properties of the C8S3 J-aggregate to …
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Three-photon Absorption Process In Organic Dyes Enhanced By Surface Plasmon Resonance
… we studied the 3PA of Hematoporphyrin IX and J-aggregate supramolecular systems. As a result, we were able to propose the use of 3PA in photodynamic therapy using Photofrin, the only drug approved by the FDA for PDT.
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Exciton transport and coherence in molecular and nanostructured materials
… Furthermore, we harness exciton transport in J-aggregate materials to build a platform for the enhancement of absorption and fluorescence of organic molecules and quantum dots. Second we turn to the interaction of excitons with optical microcavities. Using the thermally stable excitons in …
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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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Preparation of multifunctional nanoparticles using microfluidics
Liposomes have been the most successful drug delivery nanosystems for clinical applications; however, their large-scale production with low batch-to-batch variations remains challenging, which limited the clinical translation of new products. Microfluidics is an emerging technology for manipulating …
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