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Polymer Organic Light Emitting Diodes
Is there a difference between OLEDs (Organic Light Emitting Diodes) and LEPs (Light Emitting Polymers)?
are they just different names for the same thing? Or are LEPs where OLEDS have been painted on to the back of a piece of plastic? If there is a difference, what is it?
There is a difference
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Polymer Light Emitting Diodes Based on Polyfluorenes $138.61 This work is devoted to the study on Polymer Light Emitting Diodes (PLEDs) based on polyfluorenes, a promising class of semiconductive polymers for lightemitting diode applications. It covers theories of PLEDs, literature overview of polyfluorenebased lightemitting diodes, as well as research results by the authors. In this study, several types of PLED devices based on neat polyfluorenes or polyfluorene blends were designed, fabricated, and characterized. The electrical characteristics of two neat polyfluorenes were simulated via using space charge limited current theory for the holeonly case and/or exploiting a commercial software package. Author: Zhang, Qiushu/ Zivanovic, Sandra Binding Type: Paperback Number of Pages: 164 Publication Date: 2010/08/16 Language: English Dimensions: 5.98 x 9.01 x 0.37 inches |
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Organic Light Emitting Diodes (Hardcover) $385.4 Addressing the development of the organic light emitting diode (OLED) based on rare-earth and transition-metal complexes—Europium, Terbium, Ruthenium, and Rhenium—this unique perspective explains how these materials can be used to build organic-LEDs, from chemistry synthesis to device operation and the related charge transfer and confinement. Examining how organic materials can be used to build organic-LEDs, the relationship between the chemistry molecule "design," and state-of-the-art and expected pathways, this intelligent report provides intensive experimental results for scientists and engineers working in this new OLED framework, while maintaining a didactic utility for graduation students and teachers studying optoelectronics. |
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Electroluminescence in Organic Light-emitting Diodes $80.93 No Synopsis Available |
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Organic Light-Emitting Diodes: Principles, Characteristics & Processes $233.95 No Synopsis Available |
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Light-Emitting Diodes (Hardcover) $186.1 Revised and fully up-dated, the second edition of this graduate textbook offers a comprehensive explanation of the technology and physics of LEDs such as infrared, visible-spectrum, ultraviolet, and white LEDs made from III-V semiconductors. Elementary properties such as electrical and optical characteristics are reviewed, followed by the analysis of advanced device structures. With nine additional chapters, the treatment of LEDs has been vastly expanded, including new material on device packaging, reflectors, UV LEDs, III-V nitride materials, solid-state sources for illumination applications, and junction temperature. Radiative and non-radiative recombination dynamics, methods for improving light extraction, high-efficiency and high-power device designs, white-light emitters with wavelength-converting phosphor materials, optical reflectors, and spontaneous recombination in resonant-cavity structures are discussed in detail. With exercises, solutions, and illustrative examples, this textbook will be of interest to scientists and engineers working on LEDs and graduate students in electrical engineering, applied physics, and materials science. |
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Light-Emitting Diodes $87.75 No Synopsis Available |
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Organic Light Emitting Diodes : The Use of Rare Earth and Transition Metals $146.2 No Synopsis Available |
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Principles of Polymer Chemistry (Hardcover) $223.21 This successful textbook undergoes a change of character in the third edition. Where earlier editions covered organic polymer chemistry, the third edition covers both physical and organic chemistry. Thus kinetics and thermodynamics of polymerization reactions are discussed. This edition is also distinct from all other polymer textbooks because of its coverage of such currently hot topics as photonic polymers, electricity conducting polymers, polymeric materials for immobilization of reagents and drug release, organic solar cells, organic light emitting diodes. This textbook contains review questions at the end of every chapter, references for further reading, and numerous examples of commercially important processes. |
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Light-emitting Diodes and Optoelectronics (Hardcover) $369.61 Description not available. |
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CarbazoleBased Emitting Compounds $141.79 Carbazole is a heterocyclic tricyclic aromatic organic compound consisting of two sixmembered benzene rings fused on either side of a fivemembered nitrogencontaining ring. A large number of carbazole derivatives have been designed and synthesized and organic electronic devices based on these derivatives such as organic light emitting diodes (OLEDs), have been investigated. The optical and electrical properties of carbazoles are affected by substitution on the 2, 3, 6, 7 and 9Hpositions. Many carbazole derivatives have sufficiently high triplet energy to make them an efficient host where they can serve as red, green, or blue triplet emitters. Highly fluorescent and stable carbazolebased compounds were synthesized and characterized. Substitution of carbazoles at 3 and 6 position by tertbutyl group enhanced the solubility. Suitably susbtituted carbazoles form highly stable fluorescent organic nanoparticles. The emission of these nanoparticles was reversibly switched on/off in the bluegreen and orangered regions from a change in the ratio of the tetrahydrofuran/water system used in their preparation. Author: Adhikari, Ravi/ Neckers, Dr Douglas C. Binding Type: Paperback Number of Pages: 192 Publication Date: 2010/05/05 Language: English Dimensions: 5.98 x 9.01 x 0.44 inches |
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Fundamentals of High-Efficiency OLEDS: Basic Science to Manufacturing of Organic Light-Emitting Diodes $126.7 No Synopsis Available |
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Blue Laser and Light Emitting Diodes II $95.55 No Synopsis Available |
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Organic LightEmitting Diodes $113.11 Organic lightemitting diode (OLED) technology is used in a variety of display applications, ranging from cell phones and MP3 to prototype TVs, and holds great promise for the production of highly efficient largearea light sources and flat panel displays. It has the potential to become a multibilliondollar industry within a few years. The biggest technical challenge for OLEDs is the limited lifetime associated with elevated temperatures and exposure to moisture. The guaranteed hours of operation (15,000 hr) is currently inadequate for most TVs and replacement of LCDs with the 60,000 hr halflife. This book, therefore, investigated the thermalactivated and moistureinduced degradation pathways of small molecule based prototype OLEDs as well as interfacial electronic properties at the nanoscale level through realtime visualization. The results should help shed some lights on improving luminescence efficiency and lifetime of OLEDs, and should be especially useful to professionals in research and development of not only OLED technology but other organic electronics, or anyone else who may be interested in plastic electronics. Author: Xu, Mingsheng Binding Type: Paperback Number of Pages: 148 Publication Date: 2010/06/04 Language: English Dimensions: 5.98 x 9.01 x 0.34 inches |
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Introduction to Nitride Semiconductor Blue Lasers and Light Emitting Diodes $204.7 No Synopsis Available |
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Chemistry of Discotic Liquid Crystals: From Monomers to Polymers (Liquid Crystals Book Series)
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DescriptionThe self-contained properties of discotic liquid crystals (DLCs) render them powerful functional materials for many semiconducting device applications and models for energy and charge migration in self-organized dynamic functional soft materials... |
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Organic Light-Emitting Devices
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DescriptionAlthough 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... |
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Organic Light-Emitting Materials and Devices (Optical Science and Engineering)
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DescriptionNew 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... |
What is Oled television
Organic light emitting diode televisions or the OLED TVs are television sets in which light emitting diode or light emitting polymer are used. The organic light emitting diode is any kind of light emitting diode having an emissive electroluminescence layer that is composed of a film of organic compounds. This layer contains some polymer substance which allows suitable organic compounds to be deposited. The deposits appear into rows and columns forming a flat carrier by a simple printing process. This results into a matrix of pixels which can emit light of different colors.
These systems can be used in television screens as well as computer displays and other small and portable screens like the cell phones and even PDAs. They are also extensively used in advertising and indication. In addition to theses, OLEDs are used in various light sources for general illumination as well as large area light emitting elements. Generally, they produce less light per area as compared with the inorganic LEDs which are solid state based and are mainly designed for point – light source applications.
The main benefit of the organic light emitting diode televisions over the traditional liquid crystal displays (LCDs) is their ability to function without a backlight. These devices do not require a backlight to function and therefore draws far less power that their LCD counterparts and other form of televisions. Because of this, they can operate for a long time even when powered from a battery. Again, because of this ability to operate without backlight, the display for the OLEDs can be much thinner than that of their LCD counterparts. However, they have one main limitation; their materials degenerate quite rapidly thus limiting their use.
The electroluminescence in organic materials was first produced in early 1950s by Bernanose and company workers at Nancy University in France, by the application of high voltage alternating current in air to quinacridine and acridine orange which is either deposited on or dissolved in cellulose or thin films of cellophane. The first attempt at creating a polymer LED was however made by Rodger Partridge at the National Physics Laboratory of the United Kingdom, a project which succeeded and was later patented in 1975. However, its publication delayed until 1983.
A typical OLED consists of a conducting layer, an emissive layer and three terminals of substrate, anode, and cathode. The organic molecules that make up the layers conduct electricity and have conductivity levels which range from insulators to conductors. In this respect, OLEDs are considered to be organic semiconductors.
The different manufacturing processes give OLEDs many advantages over the flat panel displays which are made from LCD technology. Firstly, the OLED televisions have significantly lower cost than the plasma displays. They also enable a great range of colors, contrast, brightness as well as the viewing angle as the pixels emit light directly. Furthermore, OLED colors appear more correct and un-shifted even with viewing angle approaching 90 degrees from the normal. Most importantly, OLED televisions save a lot of energy.
About the Author
This article was written by Lee Lazarus. Lee regularly writes reveiw and articles as an online journalist. Here he covers the topic of new technology in Cheap televisions. He regularly writes reviews of home appliances such as dishwashers and washing machines.
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