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 91 for “"OLED"”.
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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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A smart active matrix pixelated OLED display
An OLED display has been fabricated and successfully tested with an external optical feedback circuit to demonstrate improvement in uniformity. In addition, the process of making an integrated system with the optical feedback and OLED display on the same substrate is described. Future work on this …
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New Luminescent Organic and Organomatallic Materials for OLED Applications
The design, synthesis and photophysics is presented for a new series of fluorescent carbazole-2,5-diphenyl-1,3,4-oxadiazole dyad molecules and in which the topology and electronic properties are systematically varied by chemical modification. Cyclic voltammetric data, HOMO-LUMO calculations, and …
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Characterization of organic field effect transistors for OLED displays
… of OFETs that will aid the circuit design of OLED pixel drivers. The contact resistance, flat band voltage, and mobility are extracted from top contact and bottom contact transistors with current-voltage (I-V) and low frequency capacitance-voltage (C-V) measurements. Extraction of contact …
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Photophysics of small molecule organo-metallic complexes for OLED applications
… efficient emission, and have been used in OLEDs, breaking the efficiency records for both solution processed devices (27.5%), and evaporated host free emissive layers (23%). Herein I present my work using a variety of time resolved spectroscopic techniques to study the photophysical …
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Nano Structure and Novel Charging Materials of the Small Molecule Based OLED Devices
… molecule based Organic Light Emitting Diode (OLED) device by vacuum thermal deposition technology using a Kurt J. Lesker deposition machine. The system was calibrated carefully by determining the tooling factor of all the materials that were used. The indium-tin-oxide (ITO) coated glass …
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A silicon current sensing amplifier and organic imager for an optical feedback OLED display
Organic LEDs (OLEDs) have the potential to be used to build thin, flexible cost effective displays. Currently, the primary drawback to their usage lies in the difficulty of producing OLEDs that emit light at a constant and predictable brightness over their lifetime. This leads to a non-uniform …
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Palladium-catalyzed C-N cross-coupling and application to the synthesis of delayed singlet emitters for OLED development
… 3. Synthesis of Delayed Singlet Emitters for OLED Development The development of novel thermally activated delayed fluorescence (TADF) materials for use in organic light emitting devices (OLEDs) is reported. A series of triptycenebased delayed singlet emitters have been synthesized using a …
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Feedback circuit for organic LED active-matrix display drivers
… circuit for an Organic Light Emitting Diode (OLED) based display is proposed and demonstrated. An OLED-based flat panel display is brighter, much lower power, has no viewing angle limitation and potentially cheaper compared to available Liquid Crystal (LC) based displays. Despite these …
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A low power display architecture for organic light emitting diode microdisplays
Organic light-emitting diode (OLED) devices offer a very promising alternative to existing flat panel display technologies, such as liquid crystal displays (LCD) that currently dominate the market. OLED displays offer very attractive characteristics, including higher luminous, larger viewing angle, …
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The Rich Chemistry of Cyclotriveratrylene (CTV) And CT-Inspired Reactions: Anthracenes with Organic Light-Emitting Diode (OLED) Applications and the Discovery of Cascade Reactions
… construction of organic light-emitting diodes (OLEDs). Several diaryl anthracene derivatives have been synthesized and analyzed, and were found to have excellent electroluminescent properties, including one analog that exhibits an exceptionally high quantum yield. Red, green and blue are the …
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The Electrical and Mechanical Study of the Flexible Organic Light Emitting Diodes
… the same organic light emitting diode (OLED) structure on the glass substrate and the Polyethylene terephthalate (PET) substrate. The result suggests that the transparency of the substrates, the microcavity effect arising from different anode thicknesses and the surface roughness of the …
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The Optical Outcoupling of Organic Light Emitting Diodes
OLEDs have seen a strong growth in development in recent years, however up to 80% of emitted light may be lost within the OLED stack and in the substrate layers. This thesis investigates the effects of the layer stack on the OLED properties and also studies a number of approaches to substrate …
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Enhancing the efficiency of organic LEDs through spin-orbit coupling of charge-transfer states
… that this is not a fundamental limit. Two OLED structures have been studied, each providing evidence that the efficiency of the OLED can be enhanced by the use of a heavy-metal material to mix spin in charge-transfer states. A structure with a heavy-metal mixing layer placed beside a neat …
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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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Improving the external extraction efficiency of organic light emitting devices
… the last decade Organic Light Emitting Device (OLED) technology has matured, 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 …
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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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An investigation of optical properties in active and passive nanophotonic devices
… part focuses on organic light-emitting diodes (OLEDs), widely used new-generation display devices. The attention is concentrated on improving the light extraction of OLED devices, and different nanostructures are proposed based on numerical simulation for addressing the losses driven by surface …
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