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Thermally Activated Delayed Fluorescence Organic Light Emitting Diodes

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Thermally Activated Delayed Fluorescence Organic Light Emitting Diodes TADF OLEDs

Thermally Activated Delayed Fluorescence Organic Light Emitting Diodes  TADF OLEDs  Book
Author : Lian Duan
Publisher : Woodhead Publishing
Release : 2021-10-01
ISBN : 0128227737
Language : En, Es, Fr & De

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Book Description :

Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes (TADF-OLEDs) comprehensively introduces the history of TADF, along with a review of fundamental concepts. Then, TADF emitters with different colors, such as blue, green, red and NIR as well as white OLEDs are discussed in detail. Other sections cover exciplex-type TADF materials, emerging application of TADF emitters as a host in OLEDs, and applications of TADF materials in organic lasers and biosensing. Discusses green, blue, red, NIR and white TADF emitters and their design strategies for improved performance for light-emitting diode applications Addresses emerging materials, such as molecular and exciplex-based TADF materials Includes emerging applications like lasers and biosensors

Highly efficient Fully Non doped White Organic Light emitting Diodes Consisting Entirely of Thermally Activated Delayed Fluorescence Emitters1

Highly efficient Fully Non doped White Organic Light emitting Diodes Consisting Entirely of Thermally Activated Delayed Fluorescence Emitters1 Book
Author : Anonim
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Abstract : A fully non-doped all-TADF strategy is proposed to fabricate simple and efficient WOLEDs based on a novel yellow TADF emitter. Abstract : Thermally activated delayed fluorescence (TADF) emitters can harvest singlet and triplet excitons for light emission to afford highly efficient organic light-emitting diode (OLED) devices, especially for all-TADF white OLEDs (WOLEDs). However, the majority of TADF emitters suffer from concentration quenching effects and require complicated doping techniques for device fabrication. Herein, we demonstrate a yellow TADF emitter that enables non-doped OLED systems, which is beneficial for the simplification of the OLED device structure and fabrication. The non-doped yellow OLED achieves a maximum external quantum efficiency (EQE) of 16.7% at a high luminance of 3600 cd m −2, in which such a high magnitude is rarely reported. More significantly, by the combination of the yellow TADF emitter with a blue TADF emitter, a fully non-doped emissive layer (EML) strategy has been demonstrated for the fabrication of an all-TADF WOLED, in which the non-doped yellow and blue TADF emissive layers are closely stacked together without any interlayers. The fully non-doped WOLEDs show a maximum EQE of up to 19.8%, along with high quality white-light emission. This is the first report regarding the fully non-doped all-TADF WOLEDs, and the presented design strategy provides a universal route towards the fabrication of simple and efficient WOLEDs.

Highly Efficient OLEDs

Highly Efficient OLEDs Book
Author : Hartmut Yersin
Publisher : Wiley-VCH
Release : 2018-11-19
ISBN : 3527339000
Language : En, Es, Fr & De

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Book Description :

The essential resource that offers a comprehensive understanding of OLED optimizations Highly Efficient OLEDs. Materials Based on Thermally Activated Delayed Fluorescence (TADF) offers substantial information on the working principle of OLEDs and on new types of emitting materials (organic and inorganic). As the authors explain, OLEDs that use the Singlet-Harvesting mechanism based on the molecular property of TADF work according to a new exciton harvesting principle. Thus, low-cost emitter materials, such as Cu(I) or Ag(I) complexes as well as metal-free organic molecules, have the potential to replace high-cost rare metal complexes being currently applied in OLED technology. With contributions from an international panel of experts on the topic, the text shows how the application of new TADF materials allow for the development of efficient OLED displays and lighting systems. This new mechanism is the gateway to the third-generation of luminescent materials. This important resource: Offers a state-of-the-art compilation of the latest results in the dynamically developing field of OLED materials Is edited by a pioneer in the field of OLED material technology Contains a detailed application-oriented guide to new low-cost materials for displays and lighting Puts the focus on the emerging fields of OLED technology Written for materials scientists, solid state chemists, solid state physicists, and electronics engineers, Highly Efficient OLEDs. Materials Based on Thermally Activated Delayed Fluorescence offers a comprehensive resource to the latest advances of OLEDs based on new TADF materials.

High Efficiency and Stable Organic Light Emitting Diodes Based on Thermally Activated Delayed Fluorescence Emitter Supported by the National Natural Science Foundation of China Under Grant Nos 61420106002 51373189 61178061 and 61227008 the Hundred Talents Program of the Chinese Academy of Sciences the National Basic Research Program of China Under Grant No 2014CB932600 and the Start Up Fund of the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences

High Efficiency and Stable Organic Light Emitting Diodes Based on Thermally Activated Delayed Fluorescence Emitter Supported by the National Natural Science Foundation of China Under Grant Nos 61420106002  51373189  61178061  and 61227008  the Hundred Talents Program of the Chinese Academy of Sciences  the National Basic Research Program of China Under Grant No 2014CB932600  and the Start Up Fund of the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences Book
Author : Anonim
Publisher : Unknown
Release : 2016
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Abstract : High efficiency, stable organic light-emitting diodes (OLEDs) based on 2-pheyl-4′-carbazole-9-H-Thioxanthen-9-one-10, 10-dioxide (TXO-PhCz) with different doping concentration are constructed. The stability of the encapsulated devices are investigated in detail. The devices with the 10 wt% doped TXO-PhCz emitter layer (EML) show the best performance with a current efficiency of 52.1 cd/A, a power efficiency of 32.7 lm/W, and an external quantum efficiency (EQE) of 17.7%. The devices based on the 10 wt%-doped TXO-PhCz EML show the best operational stability with a half-life time (LT50) of 80 h, which is 8 h longer than that of the reference devices based on fac-tris(2-phenylpyridinato)iridium(III) (Ir(ppy)3 ). These indicate excellent stability of TXO-PhCz for redox and oxidation processes under electrical excitation and TXO-PhCz can be potentially used as the emitters for OLEDs with high efficiency and excellent stability. The high-performance device based on TXO-PhCz with high stability can be further improved by the optimization of the encapsulation technology and the development of a new host for TXO-PhCz.

A New Generation of Organic Light Emitting Materials and Devices

A New Generation of Organic Light Emitting Materials and Devices Book
Author : Shi-Jian Su,Lian Duan,Hisahiro Sasabe
Publisher : Frontiers Media SA
Release : 2019-11-27
ISBN : 288963163X
Language : En, Es, Fr & De

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Book Description :

Since the invention of the first efficient organic light-emitting diodes (OLEDs) by C. T. Tang and S. VanSlyke, OLEDs have attracted close interest as a promising candidate for next-generation full-color displays and future solid-state lighting sources because of a number of advantages like high brightness and contrast, high luminous efficiency, fast response time, wide viewing angle, low power consumption, and light weight. The recombination of holes and electrons under electrical excitation typically generates 25% singlet excitons and 75% triplet excitons. For traditional fluorescent OLEDs, only 25% singlet excitons can be utilized to emit light, while the other 75% triplet excitons are generally wasted through nonradiative transition. By adopting noble metal phosphorescent complexes, an internal quantum efficiency (IQE) of 100% could be achieved by utilizing both the 25% singlet excitons and 75% triplet excitons. However, these phosphors usually contain nonrenewable and highcost iridium or platinum noble metals. Most recently, unity IQE has been readily achieved through noble metal-free purely organic emitters, such as thermally activated delayed fluorescence (TADF) emitters, hybridized local and charge-transfer state (HLCT) “hot exciton” emitters, binary- or ternary-mixed donor-acceptor exciplex emitters, and neutral p radical emitters, etc. In addition, the combination of conventional p-type hole-transport and n-type electron-transport materials in an appropriate device structure can also provide an uncommon efficiency. Both strategies are essential and attractive for high-performance and low-cost full-color displays and white OLED applications. This Research Topic mainly focus on this new generation of organic light-emitting materials and devices, including design, synthesis, and characterization of light-emitting organic molecules with tunable excited states, and their structural, electrical, and photophysical properties. Contributions relating to carrier transporting materials and corresponding device engineering are also included. Two mini reviews and thirteen original research articles by recognized academic experts in their respective fields are collected in this Research Topic, which will offer a broad perspective of noble metal-free organic light emitters, including conventional fluorescent emitters, TADF emitters, HLCT emitters, exciplex emitters, aggregation-induced emission (AIE) luminogens, and their corresponding devices. We believe this eBook should attract the attention of multidisciplinary researchers in the fields of materials science, organic synthesis, and electronic device engineering, especially for those engaged in OLED-related areas.

Light Emitting Diode

Light Emitting Diode Book
Author : Jagannathan Thirumalai
Publisher : BoD – Books on Demand
Release : 2018-09-19
ISBN : 1789237505
Language : En, Es, Fr & De

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Book Description :

The broad vision of this book is to offer book lovers a comprehensive appraisal of topics in the global advancements of experimental facts, instrumentation, and practical applications of LED and OLED materials and their applications. The prime feature of this book is connected with LED and OLED materials approaches of fabrication, optimization limits, and their extensive technical applications. This book is comprised of seven chapters encompassing the importance of LEDs and OLEDs, the history of LEDs and OLEDs with necessary examples, the phototoxic-cum-bactericidal effect due to the usage of blue LED irradiation, DC network indoor and outdoor LED lighting, WLEDs with thermally activated delayed fluorescence emitters, tetradentate cyclometalated platinum (II) complex-based efficient organic LEDs, the impact of the use of large LED lighting loads in low-voltage networks, highly efficient OLEDs using thermally activated delayed fluorescent materials, and AlGaN deep ultraviolet LEDs. Individual chapters provide a base for the wide range of common bibliophiles in diversified fields, students, and researchers, who may conduct research pertinent to this book and will find simply explained basics as well as advanced principles of designated subjects related to these phenomena. The book was created from seven contributions from experts in the diversified fields of LED and OLED fabrication and technology from over 15 research institutes across the globe.

Highly Efficient Blue Organic Light emitting Diodes from Pyrimidine based Thermally Activated Delayed Fluorescence Emitters1

Highly Efficient Blue Organic Light emitting Diodes from Pyrimidine based Thermally Activated Delayed Fluorescence Emitters1 Book
Author : Anonim
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Abstract : Three highly efficient blue thermally activated delayed fluorescence (TADF) emitters have been synthesized based on pyrimidine, 2-methylpyrimidine and 2-phenylpyrimidine as the acceptor and 10 H -spiro[acridan-9, 9′-fluorene] as the donor moiety. Abstract : Three highly efficient blue thermally activated delayed fluorescence (TADF) emitters, 2SPAc-HPM, 2SPAc-MPM and2SPAc-PPM, have been synthesised based on pyrimidine (PM), 2-methylpyrimidine (MPM) and 2-phenylpyrimidine (PPM) as the acceptor and 10 H -spiro[acridan-9, 9′-fluorene] (2SPAc) as the donor moiety. With their appropriate molecular design, these emitters successfully achieve small singlet–triplet splitting energies for efficient reverse intersystem crossing, and exhibit high photoluminescence quantum yields. As a result, TADF OLEDs based on2SPAc-HPM, 2SPAc-MPM and2SPAc-PPM emit blue light peaking at 479–489 nm and generate very high external quantum efficiencies of 25.56%, 24.34% and 31.45%, respectively. The2SPAc-PPM -based TADF OLED is also one of the very few blue TADF emitters with an external quantum efficiency of more than 30%, and it has the best OLED performance among the pyrimidine-based TADF emitters.

Recent Advances in Thermally Activated Delayed Fluorescence Materials

Recent Advances in Thermally Activated Delayed Fluorescence Materials Book
Author : Eli Zysman-Colman,Sebastian Reineke,Guohua Xie,Chihaya Adachi
Publisher : Frontiers Media SA
Release : 2021-03-08
ISBN : 2889663930
Language : En, Es, Fr & De

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Book Description :

Download Recent Advances in Thermally Activated Delayed Fluorescence Materials book written by Eli Zysman-Colman,Sebastian Reineke,Guohua Xie,Chihaya Adachi, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Advanced Nanomaterials for Solar Cells and Light Emitting Diodes

Advanced Nanomaterials for Solar Cells and Light Emitting Diodes Book
Author : Feng Gao
Publisher : Elsevier
Release : 2019-04-10
ISBN : 0128136480
Language : En, Es, Fr & De

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Book Description :

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

Materials for Solid State Lighting and Displays

Materials for Solid State Lighting and Displays Book
Author : Adrian Kitai
Publisher : John Wiley & Sons
Release : 2017-03-06
ISBN : 1119140587
Language : En, Es, Fr & De

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Book Description :

Cover -- Title Page -- Copyright -- Contents -- List of Contributors -- Series Preface -- Preface -- Acknowledgments -- About the Editor -- Chapter 1 Principles of Solid State Luminescence -- 1.1 Introduction to Radiation from an Accelerating Charge -- 1.2 Radiation from an Oscillating Dipole -- 1.3 Quantum Description of an Electron during a Radiation Event -- 1.4 The Exciton -- 1.5 Two-Electron Atoms -- 1.6 Molecular Excitons -- 1.7 Band-to-Band Transitions -- 1.8 Photometric Units -- 1.9 The Light Emitting Diode -- References -- Chapter 2 Quantum Dots for Displays and Solid State Lighting -- 2.1 Introduction -- 2.2 Nanostructured Materials -- 2.3 Quantum Dots -- 2.3.1 History of Quantum Dots -- 2.3.2 Structure and Properties Relationship -- 2.3.3 Quantum Confinement Effects on Band Gap -- 2.4 Relaxation Process of Excitons -- 2.4.1 Radiative Relaxation -- 2.4.2 Nonradiative Relaxation Process -- 2.5 Blinking Effect -- 2.6 Surface Passivation -- 2.6.1 Organically Capped QDs -- 2.6.2 Inorganically Passivated QDs -- 2.7 Synthesis Processes -- 2.7.1 Top-Down Synthesis -- 2.7.2 Bottom-Up Approach -- 2.8 Optical Properties and Applications -- 2.8.1 Displays -- 2.8.2 Solid State Lighting -- 2.8.3 Biological Applications -- 2.9 Perspective -- Acknowledgments -- References -- Chapter 3 Color Conversion Phosphors for Light Emitting Diodes -- 3.1 Introduction -- 3.2 Disadvantages of Using LEDs Without Color Conversion Phosphors -- 3.3 Phosphors for Converting the Color of Light Emitted by LEDs -- 3.3.1 General Considerations -- 3.3.2 Requirements of Color Conversion Phosphors -- 3.3.3 Commonly Used Activators in Color Conversion Phosphors -- 3.3.4 Strategies for Generating White Light from LEDs -- 3.3.5 Outstanding Problems with Color Conversion Phosphors for LEDs

Through space Interactions in Thermally Activated Delayed Fluorescent Emitters

Through space Interactions in Thermally Activated Delayed Fluorescent Emitters Book
Author : Nidhi Sharma
Publisher : Unknown
Release : 2020
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Through space Interactions in Thermally Activated Delayed Fluorescent Emitters book written by Nidhi Sharma, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

New Generation of High Efficient OLED Using Thermally Activated Delayed Fluorescent Materials

New Generation of High Efficient OLED Using Thermally Activated Delayed Fluorescent Materials Book
Author : Manish Kumar
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

The search for efficient materials for organic light emitting diodes is one of the most imperative research area. The focus is to obtain a bright large area emitter, limited by the low internal quantum efficiency of conventional organic emitters. Recently, a new generation of the organic materials (TADF) with a theoretical internal quantum efficiency up to 100%, opened new frameworks. However, significant challenges persist to achieve full understanding of the TADF mechanism and to improve the OLEDs stability. Starting from the photo-physical analysis, we show the relationship with the molecular electrical carrier dynamics and internal quantum efficiencies. The OLED structure, fabrication, and characterization are also discussed. Several examples for the full colour emitters are given. Special emphasis on experimental results is made, showing the major milestones already achieved in this field.

Magnetic Field Effects in Exciplex and Exciton based Organic Light Emitting Diodes and Radical doped Devices

Magnetic Field Effects in Exciplex  and Exciton based Organic Light Emitting Diodes and Radical doped Devices Book
Author : Yifei Wang (PhD)
Publisher : Unknown
Release : 2017
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Here we utilizes slight alterations to the device properties, the addition of a radical-doped functional layer, in which the spin-relaxing effects of localized nuclear spins and electronic spins interfere, to address the assumption about the importance of the hyperfine interaction and to attempt to differentiate between the different models for OMAR. A feature where the magnitude of OMAR exhibits a plateau over a wide range of doping fraction was observed at all temperatures investigated. This phenomenon is well explained by a theory in which a single dopant spin strongly interacts, by exchange, with one of the bottleneck sites. A similar can be used to explain the efficiency increases observed in organic solar cells for certain doping fractions.

Frontiers of Energy Materials and Information Engineering

Frontiers of Energy  Materials and Information Engineering Book
Author : Jimmy Chih Ming Kao,Wen Pei Sung,Ran Chen
Publisher : Trans Tech Publications Ltd
Release : 2014-10-01
ISBN : 3038266612
Language : En, Es, Fr & De

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Book Description :

Collection of Selected, Peer Reviewed Papers from the 2014 International Conference on Frontiers of Energy, Materials and Information Engineering (ICFMEI 2014), August 21-22, 2014, Hong Kong. The 411 papers are grouped as follows: Chapter 1: Materials and Chemical Engineering and Technologies, Chapter 2: Power, Energy and Thermal Engineering, Environmental and Safety Engineering, Chapter 3: Civil and Building Engineering, Structural and Geotechnical Engineering, Applied Mechanics, Chapter 4: Mechatronics, Measurement and Detection, Control and Automation, Mechanics Applications, Chapter 5: Computer, Communication, Information, Algorithms and Numerical Methods of Data Processing Engineering, Chapter 6: Urban and City Development, Traffic and Transportation Engineering, Chapter 7: New Technologies in Education and Sports, Chapter 8: Engineering Management, Production Management, Business and Economics.

Design and Synthesis of Ligands for Luminescent Metal Complexes

Design and Synthesis of Ligands for Luminescent Metal Complexes Book
Author : Tyler Ian Davis
Publisher : Unknown
Release : 2019
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Luminescent metal complexes have been extensively investigated for a wide range of applications, including biological imaging and organic light emitting diodes (OLEDs). The ligand 2,6-bispyrazolepyridine (bppy) has shown itself to be an extremely effective sensitizer for Eu3+ complexes. Derivatives of this ligand have been synthesized with various oxygen containing groups attached at the 4 position of the pyrazoles. A novel diphosphine containing ligand with a terthiophene backbone has been synthesized. It is believed that this ligand could be used in Cu1+ complexes to create electropolymers capable of thermally activated delayed fluorescence (TADF)

45 4 Approach for Attaining Short Exciton Lifetime in Thermally Activated Delayed Fluorescence Emitters

45   4  Approach for Attaining Short Exciton Lifetime in Thermally Activated Delayed Fluorescence Emitters Book
Author : Anonim
Publisher : Unknown
Release : 2017
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Abstract : We report an approach to achieve short delayed fluorescence exciton lifetime in efficient green and blue thermally activated delayed fluorescence (TADF) emitters. The synthesized TADF emitters show small singlet‐triplet energy splitting, high photoluminescence quantum yields, and proper charge transfer characteristics, resulting in short delayed fluorescence exciton lifetime. The fabricated organic light emitting diodes with green and deep blue TADF emitters display maximum external quantum efficiency of 31.4% and 22.5%, respectively, and significantly low efficiency roll‐off characteristics.

Conference Record of International Display Research Conference

Conference Record of     International Display Research Conference Book
Author : Anonim
Publisher : Unknown
Release : 2008
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Conference Record of International Display Research Conference book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Modular Design Strategies for TADF Emitters

Modular Design Strategies for TADF Emitters Book
Author : Fabian Hundemer
Publisher : Unknown
Release : 2020-04-08
ISBN : 9783832550547
Language : En, Es, Fr & De

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Book Description :

Organic light-emitting diodes (OLEDs) are one of the most promising lighting technologies of the recent years not only due to their efficiency and energy saving capabilities, but also for their unique features in the realization of transparent and flexible display solutions. Thermally activated delayed fluorescence (TADF) is considered as the most promising mechanism for electroluminescence for OLED application as this allows a complete conversion of excitons to photons. In this work, strategies for the development of TADF materials for solution processed OLED devices were pursued: Isophthalonitrile- and phthalimide-based TADF emitters were chemically modified with derivatization on the acceptor and donor groups in order to study the structure-to-property relationships. A modular approach allowed the introduction of various functional groups and structural motives. Besides succeeding in attaching a TADF emitter to biomolecules and oligomers for various applications like fluorescence imaging, the optoelectronic properties were manipulated mainly with regards to the emission wavelength covering a total range of 437 nm to 541 nm with typically small increments of 2 nm. Most promising emitters were employed in solution processed OLED devices, resulting in external quantum efficiencies (EQE) of up to 16%. In addition, the tris[1,2,4]triazolo[1,3,5]triazine (TTT) core was successfully implemented as novel acceptor group for TADF emitters. Hence, a synthesis for the TTT core with peripheral donor groups was developed. The donor strength and count were identified as key drivers for the emission color (398 nm to 466 nm) and the dihedral angle as critical measure for TADF characteristics.

Zig Zag Acridine Sulfone Derivative with Aggregation Induced Emission and Enhanced Thermally Activated Delayed Fluorescence in Amorphous Phase for Highly Efficient Nondoped Blue Organic Light Emitting Diodes

Zig   Zag Acridine Sulfone Derivative with Aggregation   Induced Emission and Enhanced Thermally Activated Delayed Fluorescence in Amorphous Phase for Highly Efficient Nondoped Blue Organic Light   Emitting Diodes Book
Author : Anonim
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Zig Zag Acridine Sulfone Derivative with Aggregation Induced Emission and Enhanced Thermally Activated Delayed Fluorescence in Amorphous Phase for Highly Efficient Nondoped Blue Organic Light Emitting Diodes book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Modular Design Strategies for TADF Emitters Towards Highly Efficient Materials for OLED Application

Modular Design Strategies for TADF Emitters  Towards Highly Efficient Materials for OLED Application Book
Author : Fabian Hundemer
Publisher : Logos Verlag Berlin GmbH
Release : 2020-04-08
ISBN : 3832550542
Language : En, Es, Fr & De

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Book Description :

Organic light-emitting diodes (OLEDs) are one of the most promising lighting technologies of the recent years not only due to their efficiency and energy saving capabilities, but also for their unique features in the realization of transparent and flexible display solutions. Thermally activated delayed fluorescence (TADF) is considered as the most promising mechanism for electroluminescence for OLED application as this allows a complete conversion of excitons to photons. In this work, strategies for the development of TADF materials for solution processed OLED devices were pursued: Isophthalonitrile- and phthalimide-based TADF emitters were chemically modified with derivatization on the acceptor and donor groups in order to study the structure-to-property relationships. A modular approach allowed the introduction of various functional groups and structural motives. Besides succeeding in attaching a TADF emitter to biomolecules and oligomers for various applications like fluorescence imaging, the optoelectronic properties were manipulated mainly with regards to the emission wavelength covering a total range of 437 nm to 541 nm with typically small increments of 2 nm. Most promising emitters were employed in solution processed OLED devices, resulting in external quantum efficiencies (EQE) of up to 16%. In addition, the tris[1,2,4]triazolo[1,3,5]triazine (TTT) core was successfully implemented as novel acceptor group for TADF emitters. Hence, a synthesis for the TTT core with peripheral donor groups was developed. The donor strength and count were identified as key drivers for the emission color (398 nm to 466 nm) and the dihedral angle as critical measure for TADF characteristics.