Download or read book Photophysics of Conjugated Polymers and Oligomers written by Kurt Justin Baldwin and published by . This book was released on 1997 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Allgemeiner Teil Subsect Caprini written by and published by . This book was released on 1988 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photophysics of PI conjugated Polymers and Oligomers that Incorporate Metal to Ligand Charge Transfer Chromophores written by Kevin D. Ley and published by . This book was released on 2000 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photophysics of Conjugated Polymers written by Tieneke E. Dykstra and published by . This book was released on 2008 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Poly (para-phenylenevinylene) (PPV), and its derivatives such as poly [2-methoxy, 5-(2'-ethyl-hexoxy)-1,4-phenylene vinylene] (MEH-PPV), are typical conjugated polymers. In order to implement conjugated polymers into processable electronics technologies, we must first understand their complex photophysical properties as their efficiencies depend on the balance between exciton recombination and charge carrier formation. The inherent complexities of these materials arise from entanglement of the pi-electron system with disorder and nuclear motions of the polymer backbone. This disorder breaks the polymer chain into conformational subunits which can couple, giving rise to a set of delocalized states formed by Coulombic interactions between proximate subunits. Characteristics of PPVs include high quantum yields, non-mirror image absorption and fluorescence line shapes, and large apparent Stokes' shifts. These properties are discussed in the context of the relationships between polymer conformation, electronic structure, coupling, disorder and polymer photophysics.These important influences are often manifest in the dynamics of what happens after photoexcitation. In this work, we present 3-pulse photon echo peak shift (3PEPS) studies of conjugated polymers in both solution and film. To elucidate timescales characteristic of relaxation processes, we have simulated the 3PEPS data simultaneously with absorption and fluorescence, observing a rapid localization of the exciton in the initial ∼ 20 fs. Additional contributions to the decay of the peakshift are discussed. We also present transient anisotropy data for PPV polymers and oligomers which is compared to dynamics simulation for isolated chains of PPVs. This work demonstrates the influence of microscopic structure on ultrafast dynamics. We show that relaxation between exciton states can lead to rapid depolarization of the anisotropy, even though the spatial extent of exciton migration may be small. Generally, the connection between conformation and electronic structure is a theme throughout this thesis.
Download or read book Photophysical Studies of Pi conjugated Oligomers and Polymers That Incorporate Inorganic MLCT Chromophores written by Keith Walters and published by . This book was released on 2019-05-31 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The photophysics and photochemistry of several molecular series incorporating inorganic MLCT chromophores within pi-conjugated oligomers and polymers is presented, including photothermal measurements to determine nonradiative decay rates. Dissertation Discovery Company and University of Florida are dedicated to making scholarly works more discoverable and accessible throughout the world. This dissertation, "Photophysical Studies of Pi-conjugated Oligomers and Polymers That Incorporate Inorganic MLCT Chromophores" by Keith A. Walters, was obtained from University of Florida and is being sold with permission from the author. A digital copy of this work may also be found in the university's institutional repository, IR@UF. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation.
Download or read book Photophysics of Conjugated Polymers written by Tieneke Emily Dykstra and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconducting Polymers written by Raquel Aparecida Domingues and published by CRC Press. This book was released on 2021-06-25 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconducting polymers are of great interest for applications in electroluminescent devices, solar cells, batteries, and diodes. This volume provides a thorough introduction to the basic concepts of the photophysics of semiconducting polymers as well as a description of the principal polymerization methods for luminescent polymers. Divided into two main sections, the book first introduces the advances made in polymer synthesis and then goes on to focus on the photophysics aspects, also exploring how new advances in the area of controlled syntheses of semiconducting polymers are applied. An understanding of the photophysics process in this kind of material requires some knowledge of many different terms in this field, so a chapter on the basic concepts is included. The process that occurs in semiconducting polymers spans time scales that are unimaginably fast, sometimes less than a picosecond. To appreciate this extraordinary scale, it is necessary to learn a range of vocabularies and concepts that stretch from the basic concepts of photophysics to modern applications, such as electroluminescent devices, solar cells, batteries, and diodes. This book provides a starting point for a broadly based understanding of photophysics concepts applied in understanding semiconducting polymers, incorporating critical ideas from across the scientific spectrum.
Download or read book Conjugated Polymers And Oligomers Structural And Soft Matter Aspects written by Matti Knaapila and published by World Scientific. This book was released on 2017-12-12 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book identifies modern topics and current trends of structural and soft matter aspects of conjugated polymers and oligomers. Each chapter recognizes an active research line where structural perspective dominates research and therefore the book covers fundamental aspects of persistent conjugated polymer backbone, water soluble conjugated polyelectrolytes and surfactants, conjugated molecules and biomolecules and DNA and the advanced use of synchrotron radiation and electron microscopy to find out structural details in conjugated molecule films and devices as well as under ambient and extreme conditions.
Download or read book Polyfluorenes written by Ullrich Scherf and published by Springer Science & Business Media. This book was released on 2008-07-29 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: With this collection of short review papers we would like to present a broad overview of research on poly?uorenes and related heteroanalogues over the last two decades. The collection begins with papers on the synthesis of po- ?uorenesandrelatedpolyheteroarenes, thenreportsphotophysicalproperties of this class of conjugated polymers both at the ensemble and the single chain level, continues with a discussion of the rich solid state structures of poly?uorenes, and ?nally switches to device applications (e.g. in OLEDs). In addition, two chapters are devoted to de?ned oligo?uorenesas lowmolecular weight model systems forpoly?uorenes and also to degradation studies. We feel that this up-to-date collection will be very helpful to all polymer chemists and physicists, and will also aid graduate students interested in this fascinating and still growing area of research, since such a compact overview is only now available. All articles are presented by leading scientists in their ?elds, insuring state-of-the-art coverage of all relevant aspects. Together with the body of references this volume is meant to assist researchers in the daily lab routine. Moreover, Advances in Polymer Science, as an established series of high quality review papers, represents a very appropriate platform for our project.Wehopethatthisshortcollectionwillbeofgreatvaluebothforbeg- ners and established researchscientists inthe?eldofpoly?uorene research.
Download or read book Conjugated Polymer Surfaces and Interfaces written by W. R. Salaneck and published by Cambridge University Press. This book was released on 2003-10-30 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the basic physics and materials science of conjugated polymers and their interfaces.
Download or read book Study of Photo Excitations of Conjugated Polymers and Oligomers written by Yan Shi and published by . This book was released on 1997 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photophysical Studies of Pi conjugated Oligomers and Polymers that Incorporate Inorganic MLCT Chromophores written by Keith A. Walters and published by . This book was released on 2000 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Vibronic Coupling on the Photophysics of Pi conjugated Oligomers and Polymers written by Hajime Yamagata and published by . This book was released on 2013 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long lived Photophysics of Conjugated Polymers written by Christine Marie Liberatore Cuppoletti and published by . This book was released on 2002 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Excited State Properties of Organic and Organometallic Oligomers Polymers and Materials and Their Solid State Applications written by Randi Sue Price and published by . This book was released on 2013 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research is to study the excited state dynamics of conjugated molecules, oligomers and polymers in the solid state and compare these photophysical properties to those found in solution. To study the triplet excited state dynamics of films a new nanosecond transient absorption instrumentation was developed. This instrument can detect transient absorption with ... A as low as of 10-3. Using this newly available instrumentation, it is possible to measure the triplet excited state dynamics so as to gain insight into several solid-state applications of photoactive molecules, oligomers, and polymers. A series of p-phenylene vinylene platinum acetylide complexes are studied for optical power limiting applications, and they are incorporated into poly(methyl methacrylate) (PMMA) monoliths. The photophysical properties of the monoliths and Triplet-triplet annihilation in conjugated co-polymers containing phenylene and p-phenylene vinylene platinum acetylide units is observed and compared against representative "monomer" complexes using transient absorption spectroscopy as a function of increasing laser fluence of the excitation pulse. The interaction between conjugated polymer, MEH-PPV, and a trimeric perfluoro-ortho-phenylene mercury complex, Hg3 is investigated in solution and in films. Finally cationic oligomers are intercalated into a clay host, and the photophysical properties of the clay-oligomer hybrid are investigated in disperse solutions and in films.
Download or read book Single Molecule Studies of Structure property Relationships in Well defined Conjugated Oligomers and Push pull Conjugated Polymers written by Beiyue Shao and published by . This book was released on 2017 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electronic properties of conjugated polymers are strongly dependent on their morphologies. Despite continuous research efforts in conjugated polymers (CPs) as a promising alternative to traditional inorganic semiconductors for flexible and wearable optoelectronic devices, the morphological and associated electronic properties in CPs still remain ambiguous due to their inherently heterogeneous structures both at the bulk film level and single molecule level. In the studies presented in this dissertation, single molecule spectroscopy techniques were employed to understand the single chain morphology and how it affected photophysics. Structurally well-defined model materials based on bis(2-ethylhexyl)-p-phenylene vinylene (BEH-PPV) oligomers, as a simplified model of CPs, were strategically designed to control folding at the single molecule level. Significant morphological variations were found by incorporating both rigid bent and linear linkers into the backbone, as well as by manipulating the chromophore size. The longest chromophore with the linear linker displayed best single molecule folding order and the film packing was further reinforced by the stronger [pi]-[pi] interactions between the longer conjugated segments. In addition, single chain folding via hydrogen-bonding side chain inclusion was demonstrated on the otherwise isotropic model material composed of a series of BEH-PPV trimers linked with flexible linkers. In comparison with a control oligomer system with non-hydrogen-bonding side chains, the oligomers with hydrogen-bonding motifs showed highly ordered structures and enhanced monomer interactions. These studies were further extended to a new class of emerging push-pull conjugated polymers (also known as donor-acceptor copolymers), specifically poly[N-(1- octylnonyl)-2,7-carbazole]-alt-5,5-[4’,7’-di(thien-2-yl)-2’,1’,3’-benzothiadiazole] (PCDTBT). By probing the polymer chain folding as a function of molecular weight using single molecule techniques, it was found that there are two emissive species in this material. Above a critical molecular weight, the polymer transitions from a non-interacting, more ordered conformation to a self-interacting, more isotropic conformation.
Download or read book Photophysics of Molecular Materials written by Guglielmo Lanzani and published by John Wiley & Sons. This book was released on 2006-05-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon based pi-conjugated materials offer a broad range of applications, going from molecular electronics and single molecule devices to nanotechnology, plastic electronics and optoelectronics. The proper physical description of such materials is in between that of molecular solids and that of low-dimensional covalent semiconductors. This book is a comprehensive review of their elementary excitations processes and dynamics, which merges the two viewpoints, sometimes very different if not contrasting. In each chapter, a broad tutorial introduction provides a solid physical background to the topic, which is further discussed based on recent experimental results obtained via state-of-the-art techniques. Both the molecular, intra-chain character and the solid state, inter-molecular physics is addressed. Reports on single molecule and single polymer chain spectroscopy introduce the on-site phenomena. Several chapters are dedicated to nano-probes, steady state and transient spectroscopies. The highly ordered state, occurring in single crystals, is also discussed thoroughly. Finally, less conventional tools such as THz spectroscopy are discussed in detail. The book provides a useful introduction to the field for newcomers, and a valid reference for experienced researchers in the field.
