Download or read book Exciton Dynamics in White Organic Light Emitting Diodes Comprising Triplet Harvesting written by Simone Hofmann and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization and Modelling of the Emission Zone and Exciton Dynamics in Doped Organic Light Emitting Diodes written by Markus Regnat and published by . This book was released on 2019 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'auteur: OLED ; emission zone ; angle-dependent electroluminescence spectra ; exciton dynamics ; device model ; electro-optical simulations ; TADF ; exciplex host ; triplet harvesting.
Download or read book Nanotechnology and Nanomaterials for Energy written by Pierre-Camille Lacaze and published by John Wiley & Sons. This book was released on 2021-12-07 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major topical and societal issues of energy transition and environmental conservation have benefited from the contribution of nanotechnologies and nanomaterials. Nanomaterials, including carbon-based newcomers, have helped to improve in particular the performance of energy storage and conversion devices. Some of these nanomaterials, including fullerenes, carbon nanotubes, nanodiamonds and carbon dots, were discovered well before the 2000s. Others are more recent, including graphene (the leading material of the 21st century) as well as many mineral materials developed at the nano scale: atomic clusters, metal or semiconductor nanoparticles, two-dimensional inorganic materials, metal-organic frameworks (MOF) and luminescent quantum dots. All of these are involved in the realization of devices for energy purposes. Nanotechnology and Nanomaterials for Energy provides a critical analysis of the latest work in the fields of batteries, photovoltaics, fuel cells and catalysis as well as lighting, with the advent of light-emitting diodes.
Download or read book Organic Light Emitting Diodes written by Jan Kalinowski and published by CRC Press. This book was released on 2018-10-03 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic Light Emitting Diodes: Principles, Characteristics, and Processes presents recent developments in organic electroluminescence and their application to light emitting diodes. In six chapters and complete with an extensive set of references, it describes and illustrates the physical principles of organic LEDs and their electrical and optical characteristics with a wide range of examples and practical studies. The author presents a unified approach to the description and functioning of organic LEDs, based on a comprehensive background of relevant physical processes and provides a clear foundation for the prediction and design of new improved electroluminescent devices.
Download or read book Highly Efficient and Stable Hybrid White Organic Light Emitting Diodes with Controllable Exciton Behavior by a Mixed Bipolar Interlayer Supported by the National Natural Science Foundation of China Under Grant written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Highly efficient and stable hybrid white organic light-emitting diodes (HWOLEDs) with a mixed bipolar interlayer between fluorescent blue and phosphorescent yellow emitting layers are demonstrated. The bipolar interlayer is a mixture of p-type diphenyl (10-phenyl-10H-spiro [acridine-9, 9′-fuoren]-3′-yl) phosphine oxide and n-type 2′, 2′′-(1, 3, 5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole). The electroluminance and Commission Internationale de l'Eclairage (CIE1931) coordinates' characteristics can be modulated easily by adjusting the ratio of the hole-predominated material to the electron-predominated material in the interlayer. The hybrid WOLED with a p-type:n-type ratio of 1:3 shows a maximum current efficiency and power efficiency of 61.1 cd/A and 55.8 lm/W, respectively, with warm white CIE coordinates of (0.34, 0.43). The excellent efficiency and adaptive CIE coordinates are attributed to the mixed interlayer with improved charge carrier balance, optimized exciton distribution, and enhanced harvesting of singlet and triplet excitons.
Download or read book Organic Electronics written by Stephen R. Forrest and published by Oxford University Press, USA. This book was released on 2020 with total page 1068 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides a basic understanding of the principles of the field of organic electronics through to their applications in organic devices. Useful for the student and practitioner, it is both a teaching text and a resource that is a jumping-off point for learning, working and innovating in this rapidly growing field.--Provided by publisher.
Download or read book Materials and Architectures for Efficient Harvesting of Singlet and Triplet Excitons for White Light Emitting OLEDs written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present invention relates to organic light emitting devices (OLEDs), and more specifically to OLEDS that emit light using a combination of fluorescent emitters and phosphorescent emitters for the efficient utilization of all of the electrically generated excitons.
Download or read book Efficient Organic Light emitting Diodes with Singlet Triplet and Doublet Excitons written by Qinying Gu and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Light Emitting Devices written by Joseph Shinar and published by Springer Science & Business Media. This book was released on 2004 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 or displays. The early electroluminescent devices provided reasonably bright light, but required high operating voltages, produced only a narrow range of colors, and had severely limited lifetimes. Recent developments, however, make it possible to manufacture organic light-emitting devices that are thin, bright, efficient, and stable and that produce a broad range of colors. This book surveys the current status of the field. It begins with an overview of the physics and chemistry of organic light emitting devices by J. Shinar and V. Savvateev. Subsequenbt chapters discuss the design of molecular materials for high performance devices (C. Adachi and T. Tsutsui) and chemical degradation and physical aging (K. Higginson, D. L. Thomsen, B. Yang, and F. Papadimitrakopoulos). A. Dodabalapur describes microcavity OLEDs, and Y. Shi, J. Liu, and Y. Yang discuss polymer morphology and device performance. Various aspects of devices based on polyparaphenylene vinylenes are discussed in chapters by N.C. Greenham and R.H. Friend and by H. Chayet, V. Savvateeyv, D. Davidov and R. Neumann. Chapters by S. Tasch, W. Graupner, and G. Leising and by Y. Z. Wang, D. Gebler, and A. J. Epstein describe OLEDs based on poly(paraphenylene) and poly(pyridine), respectively. The book concludes with a chapter on polyfluorene-based devices, which show great promise for producing light in all colors from blue to red.
Download or read book Organic Light Emitting Transistors written by Michele Muccini and published by John Wiley & Sons. This book was released on 2016-04-25 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of the developments and applications of Organic Light Emitting Transistors (OLETs) science and technology This book discusses the scientific fundamentals and key technological features of Organic Light Emitting Transistors (OLETs) by putting them in the context of organic electronics and photonics. The characteristics of OLETs are benchmarked to those of OLEDs for applications in Flat Panel Displays and sensing technology. The authors provide a comparative analysis between OLED and OLET devices in order to highlight the fundamental differences in terms of device architecture and working principles, and to point out the enabling nature of OLETs for truly flexible displays. The book then explores the principles of OLET devices, their basic optoelectronic characteristics, the properties of currently available materials, processing and fabrication techniques, and the different approaches adopted to structure the active channel and to control organic and hybrid interfaces. Examines the photonic properties of OLETs, focusing on the external quantum efficiency, the brightness, the light outcoupling, and emission directionality Analyzes the charge transport and photophysical properties of OLET, emphasizing the excitonic properties and spatial emitting characteristics Reviews the key building blocks of the OLET devices and their role in determining the device’s performance Discusses the challenges in OLET design, namely color gamut, power efficiency, and reliability Presents key applications of OLET devices and their potential impact on display technology and sensing Organic Light-Emitting Transistors: Towards the Next Generation Display Technology serves as a reference for researchers, technology developers and end-users to have a broad view of the distinguishing features of the OLET technology and to profile the impact on the display and sensing markets.
Download or read book Highly Efficient Organic Light Emitting Diodes by Exciton Harvesting written by Yi-Lu Jack Chang and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On Microcavity and Triplet Exciton Behaviour in Organic and Hybrid Light Emitting Diodes written by Chaoyu Xiang and published by . This book was released on 2014 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the long lifetime and high density of triplet excitons, exciton-exciton annihilation and exciton-polaron quenching become the dominating loss mechanisms which contribute to the phosphorescent OLED efficiency roll-off. We characterized the interactions of triplet excitons and polarons in blue phosphorescent OLEDs with ter-carbazole host materials and found that these interactions could be modified and the efficiency roll-off is suppressed by changing the host system. Highly efficient blue phosphorescent OLEDs with reduced roll-off at high luminance were demonstrated. We also show that exciton interaction can further reduce the operating voltage of fluorescent OLEDs with a luminance turn-on below the corresponding bandgap voltage of the emitter. With experiment results from electroabsorption, transient EL and PL measurements, we verified the energy from the charge transfer state of the donor and acceptor can be acquired by the triplet state, which undergoes an up-conversion path and transfers its energy to higher singlet state.
Download or read book Exciton Management in Organic Light Emitting Diodes written by Carmen Nguyen and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few decades, there has been great interest in the further development of OLEDs for practical applications. They are currently commercially-viable for low-brightness applications, such as in displays for mobile phones and televisions. However, efficiency roll-off and short device lifetimes at high luminance have restricted its progress into the lighting industry. The focus of this thesis is to study and address the major challenges that OLEDs currently face. First, energy transfer mechanisms in two-dopant sensitized fluorescence OLED systems is investigated. As most organic emitters have narrow emission bands, a combination of different coloured emitters is needed in order to achieve broadband white emission. Energy transfer mechanisms are key to ensure a balanced emission from all the colours. A model to quantify the competition between Förster and Dexter energy transfer is presented. Next, a highly simplified white OLED based on a single-emission-layer architecture is presented. This three-organic-layer device was able to achieve a low turn-on voltage of 2.7V, an external quantum efficiency of 18.9% and power efficiency of 30lm/W at practical brightness levels for lighting applications. Additionally, it exhibited good colour quality with minimal colour shifting. The origin of the improved colour shifting in the simplified device is examined. Finally, a platform for improving the device lifetime of blue OLED devices is proposed. This technique involves the introduction of a dopant to enhance the singlet to triplet ratio of excitons initially formed on the blue emitter. A high efficiency blue device was achieved with external quantum efficiency greater than 20% and the device lifetime was extended by 20-fold compared to the standard blue device without the dopant. Detailed investigation into the working mechanism of this strategy for improved device lifetime will be discussed.
Download or read book Device Physics of Organic Light emitting Diodes written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light Emitting Electrochemical Cells written by Rubén D. Costa and published by Springer. This book was released on 2017-07-31 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Solution Processable Components for Organic Electronic Devices written by Beata Luszczynska and published by John Wiley & Sons. This book was released on 2019-09-16 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides first-hand insights into advanced fabrication techniques for solution processable organic electronics materials and devices The field of printable organic electronics has emerged as a technology which plays a major role in materials science research and development. Printable organic electronics soon compete with, and for specific applications can even outpace, conventional semiconductor devices in terms of performance, cost, and versatility. Printing techniques allow for large-scale fabrication of organic electronic components and functional devices for use as wearable electronics, health-care sensors, Internet of Things, monitoring of environment pollution and many others, yet-to-be-conceived applications. The first part of Solution-Processable Components for Organic Electronic Devices covers the synthesis of: soluble conjugated polymers; solution-processable nanoparticles of inorganic semiconductors; high-k nanoparticles by means of controlled radical polymerization; advanced blending techniques yielding novel materials with extraordinary properties. The book also discusses photogeneration of charge carriers in nanostructured bulk heterojunctions and charge carrier transport in multicomponent materials such as composites and nanocomposites as well as photovoltaic devices modelling. The second part of the book is devoted to organic electronic devices, such as field effect transistors, light emitting diodes, photovoltaics, photodiodes and electronic memory devices which can be produced by solution-based methods, including printing and roll-to-roll manufacturing. The book provides in-depth knowledge for experienced researchers and for those entering the field. It comprises 12 chapters focused on: ? novel organic electronics components synthesis and solution-based processing techniques ? advanced analysis of mechanisms governing charge carrier generation and transport in organic semiconductors and devices ? fabrication techniques and characterization methods of organic electronic devices Providing coverage of the state of the art of organic electronics, Solution-Processable Components for Organic Electronic Devices is an excellent book for materials scientists, applied physicists, engineering scientists, and those working in the electronics industry.
Download or read book Organic Spintronics written by Zeev Valy Vardeny and published by CRC Press. This book was released on 2010-04-09 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Major development efforts in organic materials research has grown for an array of applications. Organic spintronics, in particular, has flourished in the area of organic magneto-transport. Reflecting the main avenues of advancement in this arena, this volume explores spin injection and manipulation in organic spin valves, the magnetic field effect in organic light-emitting diodes (OLEDs), the spin transport effect in relation to spin manipulation, organic magnets as spin injection electrodes in organic spintronics devices, the coherent control of spins in organic devices using the technique of electronically detected magnetic resonance, and the possibility of using organic spin valves as sensors.
