Studies of Solution-processed Organic Light-emitting Diodes and All-polymer Solar Cells
Studies of Solution-processed Organic Light-emitting Diodes and All-polymer Solar Cells

Author: Taeshik Earmme

Publisher:

Published: 2014

Total Pages: 222

ISBN-13:

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Organic electronics, commonly referred as plastic electronics, is an emerging technology for addressing many challenges that our society is facing. Over the past two decades, organic electronics has gained enormous attention due to its many advantages, including low power consumption, low-cost, scalable, and flexible design. Development of high-performance devices by designing new materials and related device engineering is crucial to the future advances in organic electronics. This dissertation focuses on studies of two classes of optoelectronic devices, organic light-emitting diodes (OLEDs) and all-polymer solar cells, fabricated by solution-processing of organic semiconductors, and aims to better understand structure-property-performance relationships resulting from solution-based fabrication. Study of bisindenoanthrazolines and dendritic oligoquinolines were found to be promising new electron-transport materials (ETMs) for high-performance phosphorescent OLEDs (PhOLEDs). Solution-processed multilayered blue PhOLEDs with orthogonal solution-processed ETMs were found to have the highest efficiency (luminous efficiency = 28.3 cd/A and external quantum efficiency = 15.5 %) observed to date among polymer-based devices. The surface morphology and charge-transport properties of the ETMs were successfully tuned by solution-deposition, which made it possible to eliminate the need for interfacial materials and low work function metals commonly used as cathode materials in OLEDs. High-performance solution-processed PhOLEDs using commercial ETMs were also demonstrated using orthogonal solution-processing. The bulk conductivity and charge transport properties of ETMs were enhanced by a novel solution n-doping with alkali metal salts. Sulfone- and dibenzosuberane-based materials were demonstrated as promising new classes of ETMs that possess high triplet energies (> 2.8 - 3.0 eV). Multilayered PhOLEDs with a solution-processed blue triplet emission layer using high triplet energy ETMs as an electron-transport layer were found to have significantly improved performance, including high current efficiency and external quantum efficiency (~ 20 %). Finally, solution-processed polymer/polymer blend solar cells using new naphthalene diimide-based acceptor copolymers were investigated and found to be the most efficient all-polymer solar cells reported to date. Controlling polymer blend morphology by solution-processing from a co-solvent system also led to further enhancement of device performance.

Solution-Processed Organic Light-Emitting Devices
Solution-Processed Organic Light-Emitting Devices

Author: Guohua Xie

Publisher: Elsevier

Published: 2023-09-15

Total Pages: 572

ISBN-13: 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

Polymers for Light-emitting Devices and Displays
Polymers for Light-emitting Devices and Displays

Author: Inamuddin

Publisher: John Wiley & Sons

Published: 2020-05-27

Total Pages: 288

ISBN-13: 1119654602

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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.

Advanced Nanomaterials for Solar Cells and Light Emitting Diodes
Advanced Nanomaterials for Solar Cells and Light Emitting Diodes

Author: Feng Gao

Publisher: Elsevier

Published: 2019-04-10

Total Pages: 549

ISBN-13: 0128136480

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Advanced Nanomaterials for Solar Cells and Light Emitting Diodes discusses the importance of nanomaterials as the active layers in solar cells and light emitting diodes (LEDs), along with the progress of nanomaterials as the electron and hole transporting layers. Specifically, the book reviews the use of nano-morphology of polymers, small molecules, and the organic-inorganic perovskites as the active layers in solar cells and LEDs. The design, fabrication and properties of metal-oxide-based nano-structures as electron and hole transporting layers are also reviewed. In addition, the development of plasmonic nanomaterials for solar cells and LEDs is discussed. Each topic in this book includes an overview of the materials system from principles to process. The advantages, disadvantages and related methodologies are highlighted. The book includes applications based on materials and emphasize how to improve the performance of solar cells and LEDs by the materials design, with a focus on nanomaterials. Provides latest research on nanostructured materials including small molecules, polymers, organic-inorganic perovskites, and many other relevant materials systems for solar cells and LEDs Addresses each promising materials system from principles to process, detailing the advantages and disadvantages of the most relevant methods of processing and fabrication Looks ahead to most likely techniques to improve performance of solar cells and light emitting diodes

Light-Emitting Electrochemical Cells
Light-Emitting Electrochemical Cells

Author: Rubén D. Costa

Publisher: Springer

Published: 2017-07-31

Total Pages: 371

ISBN-13: 3319586130

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This book presents the recent achievements towards the next generation of Light-emitting electrochemical cells (LEC). Its first part focus on the definition, history and mechanism of LEC, going then to concepts and challenges and, finally, giving the reader examples of current application of new electroluminescent materials. The chapters are written by different international groups working on LEC.

Organic Optoelectronic Materials
Organic Optoelectronic Materials

Author: Yongfang Li

Publisher: Springer

Published: 2015-05-30

Total Pages: 402

ISBN-13: 3319168622

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This volume reviews the latest trends in organic optoelectronic materials. Each comprehensive chapter allows graduate students and newcomers to the field to grasp the basics, whilst also ensuring that they have the most up-to-date overview of the latest research. Topics include: organic conductors and semiconductors; conducting polymers and conjugated polymer semiconductors, as well as their applications in organic field-effect-transistors; organic light-emitting diodes; and organic photovoltaics and transparent conducting electrodes. The molecular structures, synthesis methods, physicochemical and optoelectronic properties of the organic optoelectronic materials are also introduced and described in detail. The authors also elucidate the structures and working mechanisms of organic optoelectronic devices and outline fundamental scientific problems and future research directions. This volume is invaluable to all those interested in organic optoelectronic materials.

Handbook of Solid-State Lighting and LEDs
Handbook of Solid-State Lighting and LEDs

Author: Zhe Chuan Feng

Publisher: CRC Press

Published: 2017-06-12

Total Pages: 968

ISBN-13: 1351647644

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This handbook addresses the development of energy-efficient, environmentally friendly solid-state light sources, in particular semiconductor light emitting diodes (LEDs) and other solid-state lighting devices. It reflects the vast growth of this field and impacts in diverse industries, from lighting to communications, biotechnology, imaging, and medicine. The chapters include coverage of nanoscale processing, fabrication of LEDs, light diodes, photodetectors and nanodevices, characterization techniques, application, and recent advances. Readers will obtain an understanding of the key properties of solid-state lighting and LED devices, an overview of current technologies, and appreciation for the challenges remaining. The handbook will be useful to material growers and evaluators, device design and processing engineers, newcomers, students, and professionals in the field.

Organic Optoelectronics
Organic Optoelectronics

Author: Wenping Hu

Publisher: John Wiley & Sons

Published: 2012-11-05

Total Pages: 503

ISBN-13: 3527653473

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Written by internationally recognized experts in the field with academic as well as industrial experience, this book concisely yet systematically covers all aspects of the topic. The monograph focuses on the optoelectronic behavior of organic solids and their application in new optoelectronic devices. It covers organic field-effect and organic electroluminescent materials and devices, organic photonics, materials and devices, as well as organic solids in photo absorption and energy conversion. Much emphasis is laid on the preparation of functional materials and the fabrication of devices, from materials synthesis and purification, to physicochemical properties and the basic processes and working principles of the devices. The only book to cover fundamentals, applications, and the latest research results, this is a handy reference for both researchers and those new to the field. From the contents: * Electronic process in organic solids * Organic/polymeric semiconductors for field-effect transistors * Organic/polymeric field-effect transistors * Organic circuits and organic single molecular transistors * Polymer light-emitting Diodes (PLEDs): devices and materials * Organic solids for photonics * Organic photonic devices * Organic solar cells based on small molecules * Polymer solar cells * Dye-sensitized solar cells (DSSCs) * Organic thermoelectric power devices

Handbook of Organic Materials for Electronic and Photonic Devices
Handbook of Organic Materials for Electronic and Photonic Devices

Author: Oksana Ostroverkhova

Publisher: Woodhead Publishing

Published: 2018-11-30

Total Pages: 914

ISBN-13: 0081022859

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Handbook of Organic Materials for Electronic and Photonic Devices, Second Edition, provides an overview of the materials, mechanisms, characterization techniques, structure-property relationships, and most promising applications of organic materials. This new release includes new content on emerging organic materials, expanded content on the basic physics behind electronic properties, and new chapters on organic photonics. As advances in organic materials design, fabrication, and processing that enabled charge unprecedented carrier mobilities and power conversion efficiencies have made dramatic advances since the first edition, this latest release presents a necessary understanding of the underlying physics that enabled novel material design and improved organic device design. Provides a comprehensive overview of the materials, mechanisms, characterization techniques, and structure property relationships of organic electronic and photonic materials Reviews key applications, including organic solar cells, light-emitting diodes electrochemical cells, sensors, transistors, bioelectronics, and memory devices New content to reflect latest advances in our understanding of underlying physics to enable material design and device fabrication