Organic Light-emitting Diodes with Doped Charge Transport Layers
Author: Jan Blochwitz
Publisher:
Published: 2001
Total Pages: 146
ISBN-13:
DOWNLOAD EBOOKPosts
Organic Light-emitting Diodes with Doped Charge Transport Layers
Author:
Publisher:
Published: 2001
Total Pages:
ISBN-13:
DOWNLOAD EBOOKOrganic dyes with a conjugated pi-electron system usually exhibit semiconducting behavior. Hence, they are potential materials for electronic and optoelectronic devices. Nowadays, some applications are already commercial on small scales. Controlled doping of inorganic semiconductors was the key step for today's inorganic semiconductor technology. The control of the conduction type and Fermi-level is crucial for the realization of stable pn-junctions. This allows for optimized light emitting diode (LED) structures with operating voltages close to the optical limit (around 2.5V for a green emitting LED). Despite that, organic light emitting diodes (OLEDs) generally consist of a series of intrinsic layers based on organic molecules. These intrinsic organic charge transport layers suffer from non-ideal injection and noticeable ohmic losses. However, organic materials feature some technological advantages for device applications like low cost, an almost unlimited variety of materials, and possible preparation on large and flexible substrates. They also differ in some basic physical parameters, like the index of refraction in the visible wavelength region, the absorption coefficient and the Stokes-shift of the emission wavelength. Doping of organic semiconductors has only been scarcely addressed. Our aim is the lowering of the operating voltages of OLEDs by the use of doped organic charge transport layers. The present work is focused mainly on the p-type doping of weakly donor-type molecules with strong acceptor molecules by co-evaporation of the two types of molecules in a vacuum system. In order to understand the improved hole injection from a contact material into a p-type doped organic layer, ultraviolet photoelectron spectroscopy combined with X-ray photoelectron spectroscopy (UPS/XPS) was carried out. The experimental results of the UPS/XPS measurements on F4-TCNQ doped zinc-phthalocyanine (ZnPc) and their interpretation is given. Measurements were done on the typic.
Polymer Light-emitting Diodes with Doped Charge Transport Layers
Author: Mingtao Lu
Publisher:
Published: 2013
Total Pages: 107
ISBN-13: 9789036759328
DOWNLOAD EBOOKOrganic Light Emitting Diode (OLED) Toward Smart Lighting and Displays Technologies
Author: Laxman Singh
Publisher: CRC Press
Published: 2023-09-29
Total Pages: 292
ISBN-13: 1000953033
DOWNLOAD EBOOKThe book Organic Light Emitting Diode (OLED) Toward Smart Lighting and Displays Technologies, edited by Laxman Singh, Rituraj Dubey, and Prof. R. N. Rai, strives to address the multiple aspects of OLEDs and their applications in developing smart lightings and displays. OLEDs have been used in almost all kinds of digital displays like those of mobile phones, laptops, tablets, phablets, TVs, etc., due to their outstanding features, including superior color quality, low cost, wide viewing angle, easy fabrication, mercury-free manufacture, tenability, stretchability, flexibility, etc. Investigations related to the synthesis of new organic materials and fabrication techniques have inspired us to write this book, which will fulfil the desire and thirst of OLEDs-based researchers. Features • Nanolithographic techniques used and the challenges involved. • Printing technology for fabrication. • Designing of hybrid perovskites. • Stretchable and flexible materials used. • Metal–dielectric composites and efficiency of organic semiconductor via molecular doping for OLEDs applications. • Organic small molecule materials and display technologies involved. • New generation of organic materials with respect to photophysical approach. • Mixed valence π-conjugated coordination polymers used. • Electroluminescent polymer used. • Blue fluorescent and phosphorescent organic materials used. In comparison to other books available related to similar topics, this book aims at those audiences who are looking for a single source for a comprehensive understanding of strategies and their challenges with respect to material fabrication of OLEDs. This book covers the pace and productivity at a uniform level in each chapter with respect to the audiences, from doctoral student to postdoctoral researchers or from postdoctoral researchers to multidisciplinary field researchers with a background in physics, chemistry, materials science, and engineering, who are already working with organic materials and their applications.
Efficient Organic Light Emitting-Diodes (OLEDs)
Author: Yi-Lu Chang
Publisher: CRC Press
Published: 2015-08-03
Total Pages: 123
ISBN-13: 9814613819
DOWNLOAD EBOOKFollowing two decades of intense research globally, the organic light-emitting diode (OLED) has steadily emerged as the ultimate display technology of choice for the coming decades. Portable active matrix OLED displays have already become prevalent, and even large-sized ultra-high definition 4K TVs are being mass-produced. More exotic applications
High Efficiency Organic Light Emitting Diodes with MoO3 Doped Hole Transport Layer
Author: Jacky Qiu
Publisher:
Published: 2012
Total Pages:
ISBN-13:
DOWNLOAD EBOOKNanostructured Organic Light-emitting Diodes with Electronic Doping, Transparent Carbon Nanotube Charge Injectors, and Quantum Dots
Author: Christopher D. Williams
Publisher:
Published: 2006
Total Pages: 232
ISBN-13:
DOWNLOAD EBOOKIn this dissertation, we discuss several new methods and procedures which we have developed and used to produce OLEDs and PLEDs. More specifically these are electronic doping of transport layers, fluorescent doping of emissive layers by semiconductor nanocrystals (NC) (also known as quantum dots (QD)), and electrode engineering, namely by the use of transparent carbon nanotube sheets as charge injectors. We expand on the existing field of molecular doping and introduce a doped device with a very thick hole transport layer. Such a device is more resistant to failure due to excessive current density. We also investigate the effects of the presence of dopant molecules in the emissive layer of a multilayer OLED. This portion of the work introduces the negative effects of electronic doping at high concentrations, when the dopant molecules are able to diffuse into the emissive layer and quench luminescence by various processes.
Solution-Processed Organic Light-Emitting Devices
Author: Guohua Xie
Publisher: Elsevier
Published: 2023-09-15
Total Pages: 572
ISBN-13: 0323951473
DOWNLOAD EBOOKSolution-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
Organic Light Emitting Diode
Author: Marco Mazzeo
Publisher: BoD – Books on Demand
Published: 2010-08-18
Total Pages: 236
ISBN-13: 9533071400
DOWNLOAD EBOOKOrganic light emitting diodes (OLEDs) have attracted enormous attention in the recent years because of their potential for flat panel displays and solid state lighting. This potential lies in the amazing flexibility offered by the synthesis of new organic compounds and by low-cost fabrication techniques, making these devices very promising for the market. The idea that flexible devices will replace standard objects such as television screens and lighting sources opens, indeed, a new scenario, where the research is very exciting and multidisciplinary. The aim of the present book is to give a comprehensive and up-to-date collection of contributions from leading experts in OLEDs. The subjects cover fields ranging from molecular and nanomaterials, used to increase the efficiency of the devices, to new technological perspectives in the realization of structures for high contrast organic displays and low-cost organic white light sources. The volume therefore presents a wide survey on the status and relevant trends in OLEDs research, thus being of interest to anyone active in this field. In addition, the present volume could also be used as a state-of-the-art introduction for young scientists.
Organic Light Emitting Diode
Author: Seung Hwan Ko
Publisher: BoD – Books on Demand
Published: 2011-07-27
Total Pages: 336
ISBN-13: 9533072733
DOWNLOAD EBOOKThis book contains a collection of latest research developments on Organic light emitting diodes (OLED). It is a promising new research area that has received a lot of attention in recent years. Here you will find interesting reports on cutting-edge science and technology related to materials, fabrication processes, and real device applications of OLEDs. I hope that the book will lead to systematization of OLED study, creation of new research field and further promotion of OLED technology for the bright future of our society.
