Pyridine-Based Conjugated Polymers: Photophysical Properties and Light- Emitting Diodes PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
We study the photophysical properties of the pyridine-based polymers poly (p-pyridyl vinylene) (PPyV) and poly (p-pyridine) (PPy). The primary photoexcitations in the pyridine-based polymers are singlet excitons. We observe direct intersystem crossing (ISC) on picosecond timescales with the volume density of triplet excitons varying with the sample morphology (film or powder). These effects are demonstrated clearly by examining the millisecond photoinduced absorption characteristics of powder and film forms of PPyV. The pyridine-based polymers have been shown to be promising candidates for polymer light-emitting devices both the 'conventional ' diode device and symmetrically configured ac light-emitting (SCALE) device. Here we examine the role of 'insulating' layers and their interfaces with the emitting layer and electrodes in the SCALE device operation with emphasis on the central role of the polymer-polymer interfaces.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
We study the photophysical properties of the pyridine-based polymers poly (p-pyridyl vinylene) (PPyV) and poly (p-pyridine) (PPy). The primary photoexcitations in the pyridine-based polymers are singlet excitons. We observe direct intersystem crossing (ISC) on picosecond timescales with the volume density of triplet excitons varying with the sample morphology (film or powder). These effects are demonstrated clearly by examining the millisecond photoinduced absorption characteristics of powder and film forms of PPyV. The pyridine-based polymers have been shown to be promising candidates for polymer light-emitting devices both the 'conventional ' diode device and symmetrically configured ac light-emitting (SCALE) device. Here we examine the role of 'insulating' layers and their interfaces with the emitting layer and electrodes in the SCALE device operation with emphasis on the central role of the polymer-polymer interfaces.
Author: Zhigang Rick Li Publisher: CRC Press ISBN: 1351832662 Category : Science Languages : en Pages : 731
Book Description
Organic Light-Emitting Materials and Devices provides a single source of information covering all aspects of OLEDs, including the systematic investigation of organic light-emitting materials, device physics and engineering, and manufacturing and performance measurement techniques. This Second Edition is a compilation of the advances made in recent years and of the challenges facing the future development of OLED technology. Featuring chapters authored by internationally recognized academic and industrial experts, this authoritative text: Introduces the history, fundamental physics, and potential applications of OLEDs Reviews the synthesis, properties, and device performance of electroluminescent materials used in OLEDs Reflects the current state of molecular design, exemplifying more than 600 light-emitting polymers and highlighting the most efficient materials and devices Explores small molecules-based OLEDs, detailing hole- and electron-injection and electron-transport materials, electron- and hole-blocking materials, sensitizers, and fluorescent and phosphorescent light-emitting materials Describes solution-processable phosphorescent polymer LEDs, energy transfer processes, polarized OLEDs, anode materials, and vapor deposition manufacturing techniques employed in OLED fabrication Discusses flexible display, the backplane circuit technology for organic light-emitting displays, and the latest microstructural characterization and performance measurement techniques Contains abundant diagrams, device configurations, and molecular structures clearly illutrating the presented ideas Organic Light-Emitting Materials and Devices, Second Edition offers a comprehensive overview of the OLED field and can serve as a primary reference for those needing additional information in any particular subarea of organic electroluminescence. This book should attract the attention of materials scientists, synthetic chemists, solid-state physicists, and electronic device engineers, as well as industrial managers and patent lawyers engaged in OLED-related business areas.
Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
We report the fabrication of light-emitting devices based on several pyridine-containing conjugated polymers and copolymers in various device configurations. The high electron affinity of pyridine based polymers enables the use of relatively stable metals such as Al or even ITO as electron injecting contacts. Taking advantages of the better electron transport properties of the pyridine-containing polymers, we fabricate bilayer devices utilizing poly(9-vinyl carbazole) (PVK) as hole transporting/electron blocking polymer, which improves the device efficiency and brightness significantly due to the charge confinement and exciplex emission at the PVK/emitting polymer interface. The incorporation of conducting polyaniline network electrode to PVK reduces the device turn on voltage significantly while maintaining the high efficiency. The control of the aggregate formation in the polymer films by blending with insulating host polymers opens up the possibility of making voltage-controlled multi-color light-emitting devices.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Pyridine-based conjugated polymers and copolymers have been shown to be excellent candidates for polymer light-emitting devices in various device configurations. The high electron affinity of pyridine based polymers enables the use of relatively stable metals such as Al as an electron injecting contact. Taking advantage of the better electron transport properties of the pyridine-containing polymers, we fabricate bilayer devices utilizing poly(9-vinyl carbazole) (PVK) as a hole transporting/electron blocking layer. This improves the device efficiency and brightness significantly due to the charge confinement and exciplex emission at the PVK/emitting polymer interface. The incorporation of conducting polyaniline network electrode into PVK reduces the device turn on voltage significantly while maintaining the high quantum efficiency, thus improving the device power efficiency. Novel device configurations such as symmetrically configured AC light-emitting (SCALE) devices enable the device to work under both forward and reverse bias as well as in AC modes, potentially improving the device stability.
Author: Zhigang Li Publisher: CRC Press ISBN: 1420017063 Category : Science Languages : en Pages : 692
Book Description
New advances offer flexible, low-cost fabrication methods for light-emitting materials, particularly in display technologies. As researchers continue to develop novel applications for these materials, feasible solutions for large-scale manufacturing are increasingly important. Organic Light-Emitting Materials and Devices covers all aspects o
Author: Inamuddin Publisher: John Wiley & Sons ISBN: 1119654653 Category : Technology & Engineering Languages : en Pages : 288
Book Description
Polymers for Light-Emitting Devices and Displays provides an in-depth overview of fabrication methods and unique properties of polymeric semiconductors, and their potential applications for LEDs including organic electronics, displays, and optoelectronics. Some of the chapter subjects include: • The newest polymeric materials and processes beyond the classical structure of PLED • Conjugated polymers and their application in the light-emitting diodes (OLEDs & PLEDs) as optoelectronic devices. • The novel work carried out on electrospun nanofibers used for LEDs. • The roles of diversified architectures, layers, components, and their structural modifications in determining efficiencies and parameters of PLEDs as high-performance devices. • Polymer liquid crystal devices (PLCs), their synthesis, and applications in various liquid crystal devices (LCs) and displays. • Reviews the state-of-art of materials and technologies to manufacture hybrid white light-emitting diodes based on inorganic light sources and organic wavelength converters.
Author: Christine Luscombe Publisher: Royal Society of Chemistry ISBN: 1782624007 Category : Technology & Engineering Languages : en Pages : 293
Book Description
Semiconducting polymers are of great interest for applications in electroluminescent devices, solar cells, batteries and diodes. In recent years vast advances have been made in the area of controlled synthesis of semiconducting polymers, specifically polythiophenes. The book is separated into two main sections, the first will introduce the advances made in polymer synthesis, and the second will focus on the microstructure and property analysis that has been enabled because of the recent advances in synthetic strategies. Edited by one of the leaders in the area of polythiophene synthesis, this new book will bring the field up to date with more recent models for understanding semiconducting polymers. The book will be applicable to materials and polymers chemists in industry and academia from postgraduate level upwards.
Author: Gisela Louisa Schulz Publisher: ISBN: Category : Conjugated polymers Languages : en Pages : 0
Book Description
Chemical and structural characteristics of conjugated polymers give rise to their light-emitting and photovoltaic properties. This thesis reports on the synthesis and characterization of iridium-bound conjugated polymers. Suzuki polycondensation was used to make host-guest, alternating copolymers with iridium content varying from 0 to 40 mol %. Structure-property relationships were investigated using a wide variety of techniques including NMR, UV-vis absorption, X-ray fluorescence, and photoluminescent spectroscopies, cyclic voltammetry, gel permeation chromatography, light emitting devices and photovoltaic devices. Energy transfer in the host-guest systems from the polymer backbone to the iridium complex was studied in dilute solutions and thin films, and investigated with respect to iridium content. The relative rates of photophysical processes were used to explain the observed emission properties and correlated to polymer structure. Exchanging the 2,5-linked pyridine group with a 3,4-linked thiophene in the polymer backbone of polyfluorene copolymers, increased the polymer triplet energy level, which resulted in decreasing the back energy transfer from the iridium triplet state to the polymer triplet state. The work presented in Chapter 2 demonstrates the importance of the relative position of the triplet energy level of the polymer in comparison to the position of the triplet level of the iridium complex. The effect of triplet excitons on charge generation in photovoltaic devices was investigated. Incorporation of iridium into a polyfluorene backbone resulted in a 10-fold increase in the ratio of incident photons to converted electrons (also known as external quantum efficiency). However, when iridium was incorporated into a poly(fluorene-alt-bithiophene) polymer, photovoltaic performance decreased, thus revealing the complexity of the requirements necessary for efficient photon to electron conversion. In the case of poly(fluorene-co-bithiophene-co-iridium) it is believed that the morphology of the polymer:[6,6]-phenyl C61 butyric acid methyl ester blend plays a dominate role in determining photovoltaic properties. The structure-property relationships identified in this work build on the current understanding of iridium-bound conjugated polymers, and may be relevant to other conjugated polymer systems. The relationships drawn from this work should prove useful for the design of new polymers for light-emitting and photovoltaic applications.
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Author: Zhigang Rick Li
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Author: Zhigang Li
Author: Inamuddin
Author: Christine Luscombe
Author: Haichang Zhang
Author: Gisela Louisa Schulz
Author: American Chemical Society. Meeting