Color Tuning For Perovskite Light Emitting Diodes
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Color Tuning For Perovskite Light Emitting Diodes
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Author : Hongling Yu
language : en
Publisher: Linköping University Electronic Press
Release Date : 2020-11-11
Color Tuning For Perovskite Light Emitting Diodes written by Hongling Yu and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-11 with Electronic books categories.
Metal halide perovskites (MHPs) are recognized as promising semiconductor materials for a variety of optical and electrical device applications due to their cost-effective and outstanding optoelectronic properties. As one of the most significant applications, perovskite light-emitting diodes (PeLEDs) hold promise for future lighting and display technologies, attributed to their high photoluminescence quantum yield (PLQY), high color purity, and tunable emission color. The emission colors of PeLEDs can be tuned by mixing the halide anions, adjusting the size of perovskite nanocrystals, or changing the dimensionality of perovskites. However, in practice, all these different approaches have their own advantages and challenges. This thesis centres around the color tunability of perovskites, aiming to develop PeLEDs with different colors using different approaches. We first demonstrate red and near-infrared PeLEDs using a straightforward approach – in situ solution-processed perovskite quantum dots (PQDs). PQDs prepared from colloidal approaches are widely reported and used in LEDs. In contrast, PQDs prepared from the in situ approaches are hardly reported, although they have advantages for device applications. By employing aromatic ammonium iodide (1-naphthylmethyl ammonium iodide, NMAI) as an agent into perovskite precursor solutions, together with annealing temperature modulation, we obtain in situ grown PQDs delivering high external quantum efficiencies (EQEs) of up to 11.0% with tunable electroluminescence (EL) spectra (667 - 790 nm). Our in situ generated PQDs based on pure-halogen perovskites can be easily obtained through a simple deposition process and free of phase segregation, making them a more promising approach for tuning the emission colors of perovskite LEDs. We then move to blue PeLEDs using cesium-based mixed-Br/Cl perovskites. Although mixed halides are a straightforward strategy to tune the emission color, PeLEDs based on this approach suffer from poor color stability, which is attributed to surface defects at grain boundaries. Under the condition of optical excitations, light density over a certain value (a threshold), oxygen, and surface defects at perovskite grain boundaries are found to be key factors inducing photoluminescence (PL) spectral instability of CsPb(Br1?xClx)3 perovskites. Upon electrical bias, defects at grain boundaries provide undesirable halide migration channels, responsible for EL spectral instability issues. Through effective defect passivation, the PL spectral resistance to oxygen is enhanced; moreover, high-performance and color-stable blue PeLEDs are achieved, delivering a maximum luminance of 5351 cd m–2 and a peak EQE of 4.55% with a peak emission wavelength at 489 nm. These findings provide new insights into the color instability issue of mixed halide blue perovskites, against which we also demonstrate an effective strategy. We finally realize single-emissive-layer (EML) white PeLEDs by employing a mixed halide perovskite film as the EML. In spite of high-performance monochromatic blue, green, and red colors, the development of white PeLEDs, especially for single-EML ones, remains a very big challenge. By effective modulation of the halide salt precursors, we achieve single-EML white PeLEDs with Commission Internationale de L’Eclairage (CIE) coordinates of (0.33, 0.33), close to those (0.3128, 0.3290) of the CIE standard illuminant D65. This work not only provides a successful demonstration of a single-EML white PeLED, but also provides useful guidelines for the future development of highperformance single-EML white PeLEDs.
Perovskite Light Emitting Diodes
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Author : Hong Meng
language : en
Publisher: John Wiley & Sons
Release Date : 2024-01-03
Perovskite Light Emitting Diodes written by Hong Meng and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-03 with Technology & Engineering categories.
Perovskite Light Emitting Diodes An introduction to revolutionary display technology Perovskite Light Emitting Diodes, commonly referred to as Pe-LEDs, leverage a perovskite nanocrystal core to engender a luminous and efficient diode, holding the potential to bring about a paradigm shift in the realm of display technology. In recent times, Pe-LEDs have garnered substantial industrial interest due to their intrinsic capability to exhibit a diverse array of colors with exceptional fidelity, their operation at low voltage thresholds, and their straightforward structural composition. The prospective implications for enabling cost-effective, heightened-performance flat-panel displays as well as flexible display solutions remain notably profound. Perovskite Light Emitting Diodes: Materials and Devices presents a comprehensive and insightful overview of these diodes and their multifaceted applications. Commencing with an incisive exploration of the historical trajectory of this technology, alongside a delineation of its foundational materials and intricate device architectures, this compendium provides a gateway into both contemporaneous state-of-the-art deployments and the vanguard of ongoing research endeavors directed towards charting future advancements. Perovskite Light Emitting Diodes readers will also find: Stability analysis for different Pe-LED devices, a key aspect of creating physical displays Authorship by an established expert in organic electronics Detailed discussion of perovskite preparation methods including ultrasonic, solvent heat, thermal injection, and many more Perovskite Light Emitting Diodes is ideal for materials scientists, electrical engineers, solid state chemists, solid state physicists, inorganic chemists, and any researchers or engineers working with display technology.
Quantum Dot Based Light Emitting Diodes
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Author : Morteza Sasani Ghamsari
language : en
Publisher: BoD – Books on Demand
Release Date : 2017-10-25
Quantum Dot Based Light Emitting Diodes written by Morteza Sasani Ghamsari and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-25 with Technology & Engineering categories.
Quantum dot-based light emitting diodes were assigned to bringing together the latest and most important progresses in light emitting diode (LED) technologies. In addition, they were dedicated to gain the perspective of LED technology for all of its advancements and innovations due to the employment of semiconductor nanocrystals. Highly selective, the primary aim was to provide a visual source for high-urgency work that will define the future directions relating to the organic light emitting diode (OLED), with the expectation for lasting scientific and technological impact. The editor hopes that the chapters verify the realization of the mentioned aims that have been considered for editing of this book. Due to the rapidly growing OLED technology, we wish this book to be useful for any progress that can be achieved in future.
Organic Light Emitting Diodes
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Author : Luiz F. R. Pereira
language : en
Publisher: CRC Press
Release Date : 2012-05-29
Organic Light Emitting Diodes written by Luiz F. R. Pereira and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-05-29 with Science categories.
This book addresses the development of OLEDs based on rare-earth and transition metal complexes, especially focusing on europium, terbium, ruthenium, and rhenium. The idea is to explain how these organic materials can be used to build OLEDs. Taking into account the actual state of the art and the expected pathways, the book proposes further develop
World Scientific Handbook Of Organic Optoelectronic Devices Volumes 1 2
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Author :
language : en
Publisher: World Scientific
Release Date : 2018-06-29
World Scientific Handbook Of Organic Optoelectronic Devices Volumes 1 2 written by and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-29 with Technology & Engineering categories.
Organic (opto)electronic materials have received considerable attention due to their applications in perovskite and flexible electronics, OPVs and OLEDs and many others. Reflecting the rapid growth in research and development of organic (opto)electronic materials over the last few decades, this book provides a comprehensive coverage of the state of the art in an accessible format. It presents the most widely recognized fundamentals, principles, and mechanisms along with representative examples, key experimental data, and over 200 illustrative figures.
Hybrid Perovskite Composite Materials
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Author : Imran Khan
language : en
Publisher: Woodhead Publishing
Release Date : 2020-10-22
Hybrid Perovskite Composite Materials written by Imran Khan and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-10-22 with Technology & Engineering categories.
Hybrid Composite Perovskite Materials: Design to Applications discusses the manufacturing, design and characterization of organic-inorganic perovskite composite materials. The book goes beyond the basics of characterization and discusses physical properties, surface morphology and environmental stability. Users will find extensive examples of real-world products that are suitable for the needs of the market. Following a logical order, the book begins with mathematical background and then covers innovative approaches to physical modeling, analysis and design techniques. Numerous examples illustrate the proposed methods and results, making this book a sound resource on the modern research application of perovskite composites with real commercial value. Discusses the composition of perovskite materials and their properties, manufacturing and environmental stability Includes both fundamentals and state-of-the-art developments Features the main types of applications, including solar cells, photovoltaics, sensors and optoelectronic devices
Halide Perovskites
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Author : Tze-Chien Sum
language : en
Publisher: John Wiley & Sons
Release Date : 2019-03-25
Halide Perovskites written by Tze-Chien Sum and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-03-25 with Technology & Engineering categories.
Real insight from leading experts in the field into the causes of the unique photovoltaic performance of perovskite solar cells, describing the fundamentals of perovskite materials and device architectures. The authors cover materials research and development, device fabrication and engineering methodologies, as well as current knowledge extending beyond perovskite photovoltaics, such as the novel spin physics and multiferroic properties of this family of materials. Aimed at a better and clearer understanding of the latest developments in the hybrid perovskite field, this is a must-have for material scientists, chemists, physicists and engineers entering or already working in this booming field.
Low Dimensional Halide Perovskites
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Author : Yiqiang Zhan
language : en
Publisher: Elsevier
Release Date : 2022-11-29
Low Dimensional Halide Perovskites written by Yiqiang Zhan and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-11-29 with Technology & Engineering categories.
Low-Dimensional Halide Perovskites: Structure, Properties and Applications provides an in-depth look at halide perovskite materials and their applications. Chapters cover history, fundamentals, physiochemical and optoelectronic properties, synthesis and characterization of traditional and Pb-free halide perovskites. The book concludes with sections describing the different applications of halide perovskites for solar cells, light-emitting diodes and photo detectors, as well as the challenges faced in the industrialization of halide perovskite-based devices and forward-thinking prospects for further deployment. Discusses the applications of halide perovskites according to their dimensionality Includes a look at current challenges for the commercialization of halide perovskites, while also previewing some possible solutions Presents alternative environmentally-friendly materials that can used to replace the current toxic materials-based halide perovskites
Perovskite Quantum Dots
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Author : Ye Zhou
language : en
Publisher: Springer Nature
Release Date : 2020-08-27
Perovskite Quantum Dots written by Ye Zhou and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-08-27 with Technology & Engineering categories.
This book addresses perovskite quantum dots, discussing their unique properties, synthesis, and applications in nanoscale optoelectronic and photonic devices, as well as the challenges and possible solutions in the context of device design and the prospects for commercial applications. It particularly focuses on the luminescent properties, which differ from those of the corresponding quantum dots materials, such as multicolor emission, fluorescence narrowing, and tunable and switchable emissions from doped nanostructures. The book first describes the characterization and fabrication of perovskite quantum dots. It also provides detailed methods for analyzing the electrical and optical properties, and demonstrates promising applications of perovskite quantum dots. Furthermore, it presents a series of optoelectronic and photonic devices based on functional perovskite quantum dots, and explains the incorporation of perovskite quantum dots in semiconductor devices and their effect of the performance. It also explores the challenges related to optoelectronic devices, as well as possible strategies to promote their commercialization. As such, this book is a valuable resource for graduate students and researchers in the field of solid-state materials and electronics wanting to gain a better understanding of the characteristics of quantum dots, and the fundamental optoelectronic properties and operation mechanisms of the latest perovskite quantum dot-based devices.
Advances In Automation Mechanical And Design Engineering
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Author : Giuseppe Carbone
language : en
Publisher: Springer Nature
Release Date :
Advances In Automation Mechanical And Design Engineering written by Giuseppe Carbone and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.