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 724 for “"Diodes"”.
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Diamond Schottky barrier diodes
… by silicon carbide (SiC) Schottky batTier diodes (SBDs), commercially available since 2001, showed the potential of wide band gap semiconductors for replacing silicon (Si) in the range of medium to high voltage applications, where high frequency operation is required. With superior physical …
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Emission-tailored GaAsSb:Si luminescent diodes.
Thesis: Elec. E., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1975
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Liquid crystals for light emitting diodes
… which are applicable for organic light emitting diodes (OLEDs), were investigated. Semiempirical calculations were carried out on monomers and anti-cofacial dimers built from our molecules, representing molecules in solution and thin film respectively. Compared to the monomer a doubling of the …
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High power superluminescent light-emitting diodes
Superluminescent light-emitting diodes (SLEDs) are optoelectronic devices which combine different aspects of laser diode and LED performance. The device utilises a ridge waveguide structure to amplify spontaneously emitted light. Steps are taken to suppress feedback by minimising facet …
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Bipolar metal oxide thin film diodes
… ratio of bipolar heterojunction thin film diodes made with Cu2O and a-ZTO, and future research direction for plausible solutions to these difficulties.
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Thermal pumping of light-emitting diodes
… thermally enhanced injection in light-emitting diodes (LEDs). This effect, which we refer to as "thermal pumping", results from Peltier energy exchange from the lattice to charge carriers when current is injected into an LED. For an applied voltage V such that qV < (hw), where q is the electron …
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Scaling to submicron for III-nitride optoelectronic devices: Applications in micro light emitting diodes and resonant tunneling diodes
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
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Packaging designs for ultraviolet light emitting diodes
Aluminum Gallium Nitride (AlGaN) / Gallium Nitride (GaN) based deep ultraviolet (DUV) light emitting didoes (LEDs) with emission wavelengths between 200-280 nm enable key emerging technologies such as water/air purification and sterilization, covert communications and portable bio-agent …
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Perovskite Light-emitting Diodes with Tunable Emission
… halide perovskite material in light-emitting diodes. We demonstrate the first working perovskite light-emitting diode at room temperature by introducing thin layer of perovskite emitter which is crucial to confine the inherent free carriers in the material. We show that the 3D lead-halide bulk …
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Device physics of perovskite light-emitting diodes
… quantum efficiency of perovskite light-emitting diodes (PeLEDs) has increased rapidly to over 25%, which is comparable with that of organic LEDs. The behaviour of PeLEDs is determined by the device processes including charge injection and transport, recombination and light extraction. …
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Underwater photographic lighting using Light Emitting Diodes
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2003.
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Thermo-electrically pumped semiconductor light emitting diodes
… heat exchange in semiconductor light emitting diodes (LEDs) allows these devices to emit optical power in excess of the electrical power used to drive them, with the remaining power drawn from ambient heat. In the language of semiclassical electron transport, the electrons and holes within the …
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Point Defect Identification and Management for Sub-300 nm Light Emitting Diodes and Laser Diodes Grown on Bulk AlN Substrates
North Carolina State University Theses Materials Science and Engineering.
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Characterization of Gate Controlled Diodes for IGCT Applications
Gegenstand dieser Arbeit ist die Charakterisierung des Durchlassverhaltens, des Blockierverhaltens und des Ausschaltverhaltens von Prototypen neu entwickelter Bauelemente, die als "Gate-Gesteuerte Diode" (Gate Controlled Diode, GCD) bezeichnet werden. Diese Bauelemente wurden hergestellt und vorab …
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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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1.2-micron multi-section quantum dot superluminescent diodes
Superluminescent diodes (SLD) with a center wavelength of 1.2μm are of interest for use in medical imaging of skin tissue especially in the field of optical coherence tomography (OCT). In this thesis a ridge-waveguide multi-section quantum dot SLD that emits at 1.2μm with a bandwidth greater than …
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Transfer printing of nitride based light emitting diodes
… integration of III-nitride based light emitting diodes (LEDs) onto a wide range of substrates, whether flexible or rigid in their nature. The initial steps towards a functioning prototype are described with the successful transfer printing of 2 µm-thick micron-size LEDs. The thin structures were …
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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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Alternative transparent electrodes for organic light emitting diodes
… 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 efficiency, exceeding that of …
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