Download or read book Understanding and Controlling Conjugated Polymer Conformation and Photophysics written by Youngah Kwon and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In general, this work suggests techniques and approaches to enhance understanding of various photophysical phenomena in conjugated polymers and other multichromophoric systems over an array of length scales.
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 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 Film Stabilizaiton and Photophysics of Unconventional Conjugated Polymers written by Kara Martin and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Conjugated polymers offer a unique opportunity to develop high performing, flexible, lightweight, and large area electronic devices. With advances in conjugated polymer understanding and synthesis, the use of polymers as active layer materials in electronic applications, rather than just substrate materials, has become more promising. However, defects in morphological stability, as well as imperfect electronic understanding, are still present, limiting the use of these materials in commercializable electronics. Fundamental understanding of structure-property relationships can allow for facile synthetic solutions to major drawbacks of conjugated polymer integration in standard device architectures. Chapter 1 presents background research on the history of conjugated polymer development and the electronic device architectures these materials are typically incorporated in. Chapter 2 presents the use of thiol-ene chemistry to stabilize poly(3-alkylthiophene) films through a grafting-to procedure. This offers a simple way to produce highly oriented, insoluble, semi-conducting films through facile synthetic tuning of the polymers end-groups and side chains. In Chapter 3, the photophysics of carborane containing poly(dihexylfluorene) polymers is discussed. These unique class of materials experience drastic solvatochromism making them highly coveted for simple sensing applications. Through extensive spectroscopic investigations, a complete understanding of the excited-state dynamics is presented. Chapter 4 extends on Chapter 3 by demonstrating a straightforward method to synthesize carborane containing poly(dihexylfluorene)s with emissive properties that change with fluorene conjugation length, allowing for emission color tuning of the polymer solid and solution states. Lastly, Chapter 5 presents the synthesis of novel poly(bisthienyl carborane) and poly(bisthienyl carborane-alt-thiophene) is presented. This is the first example of a soluble conjugated polymer implementing a strong donor aromatic group and a strong acceptor carborane junction in the repeat unit. The fascinating excited-state characteristics are determined through femtosecond and nanosecond spectroscopy, showing the polymer can promote triplet formation on the carborane unit, making it useful for triplet sensitization applications. The work presented in this thesis shows that straightforward synthetic techniques can be used to highly affect the properties of common conjugated polymers, making them more robust or beneficial for electronic applications. Side-chain and backbone engineering is a necessary technique for furthering the development of useful and applicable "plastic" electronics.
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 The Physics of Polymers written by Gert R. Strobl and published by Springer Science & Business Media. This book was released on 2007-08-02 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Physics of Polymers presents the elements of this important segment of material science, focusing on concepts above experimental techniques and theoretical methods. Written for graduate students of physics, material science and chemical engineering and for researchers working with polymers in academia and industry, the book introduces and discusses the basic phenomena which lead to the peculiar physical properties of polymeric systems. The revised and expanded Third Edition includes a new chapter dealing with conjugated polymers, explaining the physical basis of the characteristic electro-optic response, and the spectacular electrical conduction properties of conjugated polymers created by doping.
Download or read book Conjugated Polymers written by J.L. Brédas and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conjugated Polymers and Designed Interfaces written by Byungjin Koo and published by . This book was released on 2017 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conformations of conjugated polymers can be altered by nearby environments. The intrapolymer conformation and interpolymer assemblies have a crucial impact on a variety of properties such as absorption, energy migration, and fluorescence. In this dissertation, the conformational changes and their effects on photophysics in different environments will be discussed. In Chapter 1, the basic principles to understand this thesis will be reviewed, including the processes of absorption and emission, exciton migration, the Langmuir-Blodgett technique, and interfacial phenomena. In Chapter 2, the conformational control and alignment of conjugated polymers at the air-water interface and how this alignment of polymers can lead to new emissive aggregates will be presented. The emission has the characteristics of excimers with the improved fluorescence quantum yields. The transfer of the aligned aggregates to glass substrates is attempted and these excimer films undergo reorganization upon exposure to solvent vapors, which triggers the fluorescence color change from yellow to cyan, leading to fluorescence-based chemical sensors. In Chapter 3, exciton migration to low-energy emissive traps at amphiphilic interfaces will be discussed. This chapter will deliver the design of interfaces and how the exciton migration can occur at the air-water interface and the hydrocarbon-water interface in lyotropic liquid crystals. To expand this interfacial exciton migration to more generalizable interfaces, Chapter 4 will show the fabrication of oil-in-water emulsions and how exciton migration in oil-in-water emulsion can produce distinct fluorescences between solution and interfaces. Chapter 5 will discuss the structural variations of novel functional conjugated polymers and how substituents can change the conformation of the polymer backbones. Additionally, how this conformational change affects the electronic and optical properties of polymers will be examined.
Download or read book Controlling Molecular Ordering in Solution State Conjugated Polymers written by and published by . This book was released on 2015 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rationally encoding molecular interactions that can control the assembly structure and functional expression in solution of conjugated polymers holds great potential for enabling optimal organic optoelectronic and sensory materials. In this work, we show that thermally-controlled and surfactant-guided assembly of water-soluble conjugated polymers in aqueous solution is a simple and effective strategy to generate optoelectronic materials with desired molecular ordering. We have studied a conjugated polymer consisting of a hydrophobic thiophene backbone and hydrophilic, thermo-responsive ethylene oxide side groups, which shows a step-wise, multi-dimensional assembly in water. By incorporating the polymer into phase-segregated domains of an amphiphilic surfactant in solution, we demonstrate that both chain conformation and degree of molecular ordering of the conjugated polymer can be tuned in hexagonal, micellar and lamellar phases of the surfactant solution. The controlled molecular ordering in conjugated polymer assembly is demonstrated as a key factor determining the electronic interaction and optical function.
Download or read book Conjugated Polyelectrolytes written by Bin Liu and published by John Wiley & Sons. This book was released on 2013-08-07 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first monograph to specifically focus on fundamentals and applications of polyelectrolytes, a class of molecules that gained substantial interest due to their unique combination of properties. Combining both features of organic semiconductors and polyelectrolytes, they offer a broad field for fundamental research as well as applications to analytical chemistry, optical imaging, and opto-electronic devices. The initial chapters introduce readers to the synthesis, optical and electrical properties of various conjugated polyelectrolytes. This is followed by chapters on the applications of these materials in optical sensing and imaging with emphasis on biological systems, while the final section addresses the emerging applications of conjugated polyelectrolytes in optoelectronic devices, concluding with an in-depth discussion of structure-property relationship. The editors and contributors are all pioneers and experts in this expanding field. This monograph is not only for chemists, materials scientists, and physicists, but also a unique source of knowledge for readers with scientific background interested in polyelectrolytes.
Download or read book Investigating the Photochemistry and Photophysics of Conjugated Polymers by Single Molecule Spectroscopy written by Dehong Hu and published by . This book was released on 1999 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Conjugated Polymers and Block Copolymers Via Catalyst Transfer Polycondensation written by Robert Jun Ono and published by . This book was released on 2013 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conjugated polymers hold tremendous potential as low-cost, solution processable materials for electronic applications such organic light-emitting diodes and photovoltaics. While the concerted efforts of many research groups have improved the performance of organic electronic devices to near-relevant levels for commercial exploitation over the last decade, the overall performance of organic light-emitting diode and organic photovoltaic devices still lags behind that of their traditional, inorganic counterparts. Realizing the full potential of organic electronics will require a comprehensive, molecular-level understanding of conjugated polymer photophysics. Studying pure, well-defined, and reproducible conjugated polymer materials should enable these efforts; unfortunately, conjugated polymers are typically synthesized by metal-catalyzed step-growth polycondensation reactions that do not allow for rigorous control over polymer molecular weight or molecular weight distribution (i.e., dispersity). Chain-growth syntheses of conjugated polymers would not only allow for precise control over the aforementioned polymer metrics such as molecular weight and dispersity, but could also potentially create new applications by enabling the preparation of more advanced macromolecular structures such as block copolymers and surface grafted polymers. Our efforts toward realizing these goals as well as toward exploiting chain-growth methodologies to better understand fundamental conjugated polymer photophysics and self-assembly will be presented.
Download or read book Conjugated Polymers written by John R. Reynolds and published by CRC Press. This book was released on 2019-03-25 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers properties, processing, and applications of conducting polymers. It discusses properties and characterization, including photophysics and transport. It then moves to processing and morphology of conducting polymers, covering such topics as printing, thermal processing, morphology evolution, conducting polymer composites, thin films
Download or read book Conjugated Polymer And Molecular Interfaces written by William R. Salaneck and published by CRC Press. This book was released on 2001-10-18 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defines the state-of-the-art in interface science for electronic applications of organic materials. Updates understanding of the foundaiton of interfacial properties. Describes novel electronic devices created from conjugated polymers and organic molecular solids.
Download or read book Morphology Effects on the Light Emitting Properties of Conjugated Polymer Blends written by Nisha Ananthakrishnan and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: This work focuses on understanding and controlling the morphology of conjugated polymer blends in order to tune their light emission properties in the visible and near infrared (NIR) regions. Conjugated polymers are attractive materials for polymer light emitting diodes (PLEDs) due to advantages which include structured control of emission, processing conditions and flexibility. One of the methods that has been harnessed to optimize the light emitting properties of conjugated polymers is polymer blending as it provides a unique pathway through which properties absent in the homopolymers can be utilized. In this dissertation, binary and ternary phase polymer blends consisting of an insulating host matrix such as poly(methyl methacrylate) (PMMA) with light emitting conjugated polymers were studied.
Download or read book Molecular Design of Conjugated Polymers for the Control of Conformation Electronics and Self assembly written by Jean Bouffard (Ph. D.) and published by . This book was released on 2008 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont) The exquisite control over conformation and surface density offered in Langmuir monolayers of amphiphilic poly(phenylene ethynylene)s at the air-water interface was exploited in spectroscopic studies of energy transfer to perylene monoimide end-groups (Chapter 6). In these, planarization increases the efficiency of intramolecular energy transfer at low surface densities, and intermolecular energy transfer pathways become predominant at high surface densities. The modulation of energy transfer at dipolar interfaces provides a transduction mechanism that makes these polymers attractive platforms for the development of new biosensors for surface interactions.
Download or read book The Effect of Illumination on the Conformation and Thermodynamics of Conjugated Polymers written by Brian Frank Morgan and published by . This book was released on 2016 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation explores the effects which illumination has on the structure and conformation of conjugated polymers, both in solution and the bulk. Conjugated polymers are an important class of optoelectronic polymeric materials which make up the active layer of key organic electronic devices such as organic photovoltaics, transistors, and light emitting diodes. Considering the strong link between polymer chain structure and device efficiency in these materials, a comprehensive understanding of certain experimental conditions which may influence this conformation and thusly alter the functionality of the devices predicated upon them is of vital importance. The first part of this dissertation provides a background to conjugated polymers, their role in common electronic applications, and the known effects of illumination on polymeric materials. The next section outlines an initial exploration of light induced effects on benchmark conjugated polymers in solution elucidated via the use of small angle neutron scattering. The third chapter explores the structural evolution of solution gels formed from conjugated polymers at multiple length scales using small and ultra small angle scattering, as well as quantifying modifications to this structural progression brought on by white light exposure. The fourth and fifth chapters further expand our understanding of the proposed thermodynamic driving forces behind the light induced structural changes in conjugated polymer solutions first through alterations in solvent quality, and then through fine-tuning of incident light wavelength, exposure time, and intensity. Finally, the sixth section studies the self-assembly of conjugated polymer composite thin films cast from a single solution through neutron reflectivity, while additionally monitoring the effects of light exposure during the thermal annealing process upon the final film depth profile. Ultimately, these works cumulatively provide strong evidence indicating that light exposure is in fact an important parameter with far-reaching implications upon the final structure of organic electronic materials. Overlooking illumination conditions and failing to provide a consistent ambient light environment throughout device fabrication will result in non-uniform chain conformations and layering architectures, inevitably impacting device performance. However, if properly understood and harnessed, these light-induced effects could make possible an entirely novel methodology for in-situ tuning of organic electronic device physical parameters.
