Pyridine Based Polymer Light-Emitting Devices

Pyridine Based Polymer Light-Emitting Devices
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Total Pages: 0
Release: 1997
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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.

Pyridine-Based Conjugated Polymers: Photophysical Properties and Light- Emitting Diodes

Pyridine-Based Conjugated Polymers: Photophysical Properties and Light- Emitting Diodes
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Total Pages: 0
Release: 1997
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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.

Novel Light-Emitting Devices Based on Pyridine-Containing Conjugated Polymers

Novel Light-Emitting Devices Based on Pyridine-Containing Conjugated Polymers
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Total Pages: 21
Release: 1997
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We present novel light-emitting devices based on several pyridine-containing conjugated polymers and copolymers in various device configurations. The high electron affinity of pyridine-based polymers improves stability and electron transport properties of the polymers and enables the use of relatively stable metal such as AL as electron injecting contacts. Bilayer devices utilizing poly (9-vinyl carbazole) (PVK) as hole transporting/electron blocking polymer show dramatically improved efficiency and brightness as compared to single layer devices, which is attributed to charge confinement and exciplex emission at the PVK/emitting polymer interface. The incorporation of conducting polyaniline network electrode top PVK reduces the device turn-on voltage significantly while maintaining the high efficiency. Novel device configurations such as inverted light-emitting devices and symmetrically configured AC light-emitting (SCALE) devices enable the use of ITO as electron injecting contact, eliminating the use of low workfunction metals as electrodes, potentially improving the device operating stability and shelf lifetime.

Light-Emitting Devices Based on Pyridine-Containing Conjugated Polymers

Light-Emitting Devices Based on Pyridine-Containing Conjugated Polymers
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Total Pages: 0
Release: 1997
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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.

Organic Light-Emitting Devices

Organic Light-Emitting Devices
Author: Joseph Shinar
Publisher: Springer Science & Business Media
Total Pages: 316
Release: 2013-03-20
Genre: Technology & Engineering
ISBN: 0387217207
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Although it has long been possible to make organic materials emit light, it has only recently become possible to do so at the level and with the efficiency and control necessary to make the materials a useful basis for illumination in any but the most specialized uses. This book surveys the current status of the field.

Organic Light-Emitting Materials and Devices

Organic Light-Emitting Materials and Devices
Author: Zhigang Rick Li
Publisher: CRC Press
Total Pages: 731
Release: 2017-12-19
Genre: Science
ISBN: 1351832662
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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.

Organic Light-Emitting Materials and Devices

Organic Light-Emitting Materials and Devices
Author: Zhigang Li
Publisher: CRC Press
Total Pages: 692
Release: 2006-09-12
Genre: Science
ISBN: 1420017063
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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

Recent Developments in the Synthesis and Applications of Pyridines

Recent Developments in the Synthesis and Applications of Pyridines
Author: Parvesh Singh
Publisher: Elsevier
Total Pages: 650
Release: 2022-09-17
Genre: Science
ISBN: 0323914594
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Recent Developments in the Synthesis and Applications of Pyridines is a comprehensive handbook for organic chemists working on innovative approaches to the synthesis of pyridines. Written by scientists in both academia and industry and designed to be a standalone reference, the book features reviews, research results and case studies on synthetic methods and applications of pyridine-based chemotypes. The book will bridge the gap between industry and academia by presenting recent innovative approaches to the synthesis of pyridines, diverse application of pyridines in drug development, heterogeneous catalysis and material science, as well as benchtop to shelf narratives of pyridine-based compounds in the industry. The role of computational chemistry in the development of pyridine-based bioactive molecules is also included. This reference is essential for researchers in organic chemistry both in academic and industrial settings, postgraduates in chemistry and medicinal chemistry. Includes a detailed review of recent research on the reactivity, synthesis and applications of pyridines Features concise accounts of the reactivity, synthetic and optimized protocols Discusses the medicinal, inorganic and polymer chemistry applications of pyridines

Polymers for Light-emitting Devices and Displays

Polymers for Light-emitting Devices and Displays
Author: Inamuddin
Publisher: John Wiley & Sons
Total Pages: 288
Release: 2020-05-19
Genre: Technology & Engineering
ISBN: 1119654653
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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.

Solution-Processed Organic Light-Emitting Devices

Solution-Processed Organic Light-Emitting Devices
Author: Guohua Xie
Publisher: Elsevier
Total Pages: 572
Release: 2023-09-15
Genre: Technology & Engineering
ISBN: 0323951473
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Solution-Processed Organic Light-Emitting Devices provides a comprehensive reference on the principles and advances in materials design, device structures, and processing technologies of organic light-emitting diodes (OLEDs). Most importantly, the book analyses the dynamics of thin-film growth from solutions such as solvent orthogonalization, coffee-ring effects, and interfacial adhesion. Exciton generation and utilization, host–guest energy transfer, and interfacial interaction in the solution-processed films are considered with the material and device design to maximize the electroluminescent performance of OLEDs.The book reviews the materials, devices, and technologies dedicated to solution-processed thin-film devices, which are not only applicable to OLEDs but may be adapted to other emerging semiconducting devices due to the similarity in methods (for instance, quantum-dot LEDs and solar cells, and perovskite-based LEDs/photovoltaics/detectors).This book is suitable for researchers in academia and industry working in the materials science and engineering, chemistry, and physics disciplines. Discusses the most relevant and emerging solution-processable materials for OLED applications Reviews device engineering to address defects, charge transport, and exciton generation in fabricated solution-processable thin films Provides the methods to grow multilayered thin films from solutions with organic semiconductors, with particular attention to new technologies to overcome interfacial mixing effects