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 88 for “"organic light emitting diodes"”.
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Fused-Molecular Systems for Organic Light Emitting Diodes
<p>Organic light emitting diodes (OLEDs) are electronic devices made by sandwitching organic light emissive materials between two electrodes. When voltage is applied across the two conductors, a bright light is generated. The color of the emitting light depends on the band gap of the semiconducting …
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The Optical Outcoupling of Organic Light Emitting Diodes
… 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 structuring and treatment in order to couple …
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Alternative transparent electrodes for organic light emitting diodes
Solid state lighting is a new environmentally friendly light source. So far, 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 …
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Photon Generation and Dissipation in Organic Light-Emitting Diodes
… emitters, the internal quantum 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 …
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Novel Host Materials for Blue Phosphorescent Organic Light-Emitting Diodes
Organic light-emitting diodes (OLEDs) have been commercially used in full-colour active matrix (AMOLED) displays for a couple of years. Only recently, a new application of OLEDs in the field of lighting has been opened up. For white emission monochrome systems of the three primary colours red, …
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Novel Concepts for High-Efficiency White Organic Light-Emitting Diodes
Diese Arbeit behandelt neue Konzepte zur Realisierung hocheffizienter Weißlicht emittierender organischer Leuchtdioden (OLEDs), wobei blaue fluoreszierende Emitter mit grünen und roten phosphoreszierenden Emittern kombiniert werden. Bisherige Ansätze zur Erreichung höchster Quantenausbeuten …
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Designing novel host materials for blue phosphorescent organic light-emitting diodes
The overall efficiency of an organic light-emitting diode (OLED) is always limited to the efficiency of its individual components. The most important component is the emission layer, where excitons are formed and light is generated. This thesis deals with the improvement of one class of OLED …
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High efficiency top-emitting organic light-emitting diodes: design and fabrication
… the techniques 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 …
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Efficient Organic Light-emitting Diodes with Singlet, Triplet and Doublet Excitons
Organic light-emitting diodes have shown a large potential and significant research progress recently. Tightly-bound excitons play an important role in the function of energy conversion and light emission for OLEDs. Many properties of excitons are determined by the spin state including singlets, …
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Excitonic spin engineering for solar cells and organic light-emitting diodes
… decades have seen renewed interest in molecular organic semiconductors. Since these materials support the formation of excitons, their behavior differs considerably from their inorganic counterparts. This gives rise to a variety of novel properties that can be exploited to create entirely new or …
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The Electrical and Mechanical Study of the Flexible Organic Light Emitting Diodes
This work begins from depositing 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 …
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Role of polythiophene- based interlayers from electrochemical processes on organic light-emitting diodes
… are employed as the hole-injection contact of organic light-emitting diodes (OLED). The polymer films are obtained by the electropolymerization or the electrochemical doping/dedoping of a spin-coated layer. Their electrical properties and energetics are tailored by electrochemical adjustment of …
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Components, production processes, and recommendations for future research in organic light emitting diodes
Organic Light Emitting Diodes (OLEDs) are small, optoelectronic devices that can be used in the production of energy-efficient, high definition displays in cell phones, computers, and televisions. These devices have great potential to replace light emitting diodes (LEDs) completely because they are …
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On the Colour Tuning and Stability of Carbene-Metal-Amide Organic Light-Emitting Diodes
… focusses on the development of a family of light emitting molecules and their incorporation 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 …
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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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Triplet Exciton Management in Organic Electronic Devices
… optoelectronic devices have been dominated by inorganic semiconductors such as silicon and gallium nitride. However organic semiconductors have many potential advantages and have shown significant research progress in both organic light-emitting diodes and organic photovoltaics. Tightly-bound …
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Synthesis, Characterization And Application Of Pt Complexes With Pincer Ccc-Bis(Nhc) Ligands
… were believed to be congeners of materials for organic light emitting diodes (OLEDs).
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