Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 108 for “"OLEDs"”.
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Optimization of molecular emitters for new generation OLEDs /
… are used in organic light-emitting diodes (OLEDs), organic thin-film transistors, solar cells and sensors, due to its especial properties enabling low-cost manufacturing techniques. Despite the great breakthrough in the creation of novel molecular emitters and OLEDs, still there are some …
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The Role of Triplet Exciton Lifetime in the Stability and Efficiency of Blue Phosphorescent OLEDs Or Why Even The Brightest OLEDs Have a Dark Side
… the past decade, organic light-emitting devices (OLEDs) have evolved from emerging technology to dominating high-end mobile displays. Active-matrix OLED (AMOLED) displays offer superior color vibrancy, contrast, and form factor. Their thin, lightweight, and flexible nature holds promise for …
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Synthesis of side-chain polystyrenes for all organic solution processed OLEDs
… in order to be applied in multilayer OLEDs fabricated by solution process techniques. Manufacture of optoelectronic devices by solution process techniques is meant to decrease significantly fabrication cost and allow large scale production of such devices. This dissertation focusses in …
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Identification and optimization of mixed light emitting layers in phosphorescent multilayer OLEDs
Phosphorescent OLEDs (PHOLEDs) based on organic small molecules offer a great potential for a variety of future applications. In terms of efficiency PHOLEDs can already compete with conventional light sources. However, PHOLEDs typically suffer from a steady decrease in efficiency at high current …
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Poly(Phenylene vinylene) And Poly(Naphthalene vinylene) Derivatives for Use in Organic Light-Emitting Diodes (OLEDs)
Organic light-emitting diodes (OLEDs) have found application in displays and lighting. The focus of this dissertation is on the synthesis of unique poly(phenylene vinylene) (PPV) derivatives and similarly structured conjugated polymers as active layers in OLED devices. One element analyzed in this …
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Alternative transparent electrodes for organic light emitting diodes
… light emitting diodes (LEDs) and organic LEDs (OLEDs) have been presented as candidates with potentially high efficiency. Recent advances of OLEDs in device architecture, light-out coupling, and materials have ensured high efficiency, exceeding that of incandescent light bulbs. In contrast to …
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Organische Leuchtdioden mit Polymeranoden
In organischen Leuchtdioden (OLEDs) werden üblicherweise anorganische Materialien wie Indium-Zinn-Oxid (ITO) als transparente leitfähige Anoden verwendet. ITO besitzt allerdings eine geringe Austrittsarbeit und kann deshalb Löcher nicht effizient in organische Materialien injizieren. Weiterhin ist …
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Excitonics for Organic Electronics
… in particular for organic light-emitting diodes (OLEDs). At the core of the device physics governing the stability and efficiency of OLEDs are tightly bound electron-hole pairs known as excitons. Here, the link between OLED excitonics and operational stability is studied in active OLEDs. First, …
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On the Colour Tuning and Stability of Carbene-Metal-Amide Organic Light-Emitting Diodes
… into organic light emitting diodes (OLEDs). OLEDs are currently widely utilised in consumer display products. Blue OLEDs, however, are unable to simultaneous meet the industrial requirements of colour purity, efficiency and device lifetime. Most consumer products choose to compromise …
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Integrated feedback circuit for organic LED display driver
Organic LEDs (OLEDs) offer the potential of ultra low power, portable display technology. The chief barrier to their usage lies in producing OLEDs that will emit light at predictable and consistent amplitudes. We propose the use of optical feedback to generate the desired luminosity pixel by pixel. …
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Improving the external extraction efficiency of organic light emitting devices
… progressing to the point where state-of-the-art OLEDs can demonstrate external extraction efficiencies that surpass those of fluorescent lights. Additionally, OLEDs have the benefits over conventional display and lighting technologies of large viewing angles and mechanical flexibility. However, …
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Photon Generation and Dissipation in Organic Light-Emitting Diodes
… efficiency of organic light-emitting diodes (OLEDs) can now reach 100%. However, a major fraction of generated photons is trapped inside the device, because of the intrinsic multi-layer device structure and the mismatch of refractive indices. This thesis comprises different approaches for the …
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Organic LEDs for optoelectronic neural networks
… of Organic Light Emitting Diodes (OLEDs) and assess their suitability for use in the Compact Optoelectronic Integrated Neural (COIN) coprocessor. The COIN coprocessor, a prototype artificial neural network implemented in hardware, seeks to implement neural network algorithms in …
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Analysis and Optimisation of an Organic Optical Link
Organic light-emitting diodes (OLEDs) have been historically used extensively for displays, and more recently for lighting applications. However, the low-cost of materials and direct-deposition manufacturing processes involved in organic semiconductor fabrication means that OLEDs are uniquely …
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Quanteneffizienz und Langzeitstabilität monochromer organischer Leuchtdioden
… die Basis für Displays und weiße Multifarben- OLEDs darstellen. Die Auswirkung der Ladungsbalance auf die interne Quanteneffizienz wird untersucht. Dabei finden Triplettemitter Verwendung, da diese aus spinstatistischen Gründen viermal effizienter als fluoreszente Substanzen sind. Für hohe …
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Investigation of phosphines as potential host materials in blue dye-doped organic light emitting devices
… most efficient organic light emitting devices (OLEDs) are based on dye-doped OLEDs. The major obstacle has been developing a host material for blue OLEDs that has sufficiently high energy of emission (<380nm) to facilitate energy transfer to the dye. Previous studies of …
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High efficiency top-emitting organic light-emitting diodes: design and fabrication
… to achieve high-performance top-emitting OLEDs, regarding device efficiency and lifetime for both non-inverted and inverted structures. It is thus organized as follows: In Chapter 2, the basic physics of organic semiconductor materials are reviewed, including the electronic properties of …
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Molekulinių spinduolių optimizacija naujos kartos organiniams šviestukams /
… are used in organic light-emitting diodes (OLEDs), organic thin-film transistors, solar cells and sensors, due to its especial properties enabling low-cost manufacturing techniques. Despite the great breakthrough in the creation of novel molecular emitters and OLEDs, still there are some …
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Improving OLED technology for displays
Organic light emitting devices (OLEDs) are brightly emissive, efficient, have fast switching speeds, and are paper-thin in format, propelling their use as an emerging flat panel display technology. However, two primary challenges prevent OLEDs from dominating the large-area display market: the …
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Novel Concepts for High-Efficiency White Organic Light-Emitting Diodes
… emittierender organischer Leuchtdioden (OLEDs), wobei blaue fluoreszierende Emitter mit grünen und roten phosphoreszierenden Emittern kombiniert werden. Bisherige Ansätze zur Erreichung höchster Quantenausbeuten basieren auf der ausschließlichen Verwendung phosphoreszierender Emitter, da …
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