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 346 for “"LEDs"”.
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Elektrische Spininjektion in GaAs LEDs
… Polarisation der Lichtemission von Spin-LEDs analysiert. Diese Polarisation erreichte schon bei geringen externen Magnetfeldern von z.B. 0.5 T sehr hohe Werte von bis zu 50 %. Im Vergleich dazu ist die intrinsische Polarisation von GaAs/(Al, Ga)As Heterostrukturen mit bis zu 5 % sehr …
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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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All inorganic colloidal quantum dot LEDs
… colloidal quantum dot light emitting devices (QD-LEDs) with metal oxide charge transport layers. Colloidally synthesized quantum dots (QDs) have shown promise as the active material in optoelectronic devices because of their tunable, narrow band emission. To date, the most efficient QD-LEDs …
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High-efficiency ultrasound-powered micro-LEDs for optogenetic applications
Gallium nitride (GaN) light-emitting diodes (LEDs) play the most important role in visible light applications, and more than 87% LEDs are used in indoor/outdoor lighting, automotive lighting, etc. Recent advancements in neuroscience and technology opened a new opportunity for LEDs to be used for …
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Preparation and characterization of AlGaN structures for UVA LEDs
Visible / UV LEDs are developed from the same III-Nitride compounds semiconductor materials and share many design and technological aspects. However, the efficiency difference between the two types is quite significant, where the latter lags. Recent advancements in material technology such as the …
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Development of 1GHz Clocked Entangled LEDs for Fibre Networks
Semiconductor quantum dots (QD)s have been well established as sources of single photons and entangled photon-pairs, both of which are essential for realising quantum networks. To be compatible with real-world applications, such a source must further conform to basic requirements including …
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Fabrication of InGaP LEDs on a graded buffer substrate
… color from three light emitting diodes (LEDs), each producing red, green, or blue light. The light from these three LEDs is chosen so that the display can generate the largest color combination possible. Tri-color LED displays typically use one of two combinations of LEDs. In the first, …
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Morphological and Electrical Change of Driven Quantum Dot LEDs
Quantum dot LEDs (QD-LEDs) are an emerging technology that promises brighter, more color pure, higher-color gamut displays. In recent years, indium phosphidenquantum dots have become the one of the most promising device emitters due to their lower toxicity. However, InP QD-LED devices require …
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Nanoscale characterization of InSb/InAs novel functional semiconductor nanostructures for LEDs / Caracterización a nanoescala de nanoestructuras funcionales novedosas de InSb/InAs para LEDs
Light emitting diodes (LEDs) are becoming increasingly popular day-by-day for lighting applications as they require low maintenance and low fabrication costs, and have long lifetime and low energy consumption. As a result, extensive research and funding have been dedicated in the last years in …
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Novel nanolasers, nano-LEDs, and modal cutoff confinement light emitters
Semiconductor metal nanocavity lasers and light emitting diodes together with novel modal cutoff confinement light emitters are investigated for optical interconnection application in future dense photonic integrated circuits. Several different cavity structures are designed, processed, and …
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Análisis de fiabilidad de leds de AlInGaP de alta eficiencia luminosa
… equipos sobre los que van montados este tipo de LEDs funcionan en ambientes exteriores, por lo que es importante analizar el efecto de la humedad y temperatura en ellos. Por otra parte al tratarse de LEDs de alta eficiencia luminosa, es importante analizar el efecto de la intensidad de corriente. …
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Characterisation and simulation of InAs/InAsSb structures for mid-infrared LEDs
… mid – infrared light – emitting diodes (LEDs) operating with sufficiently high power and efficiency for room temperature gas sensing applications. InAs/InAsSb strained – layer superlattice (SLS) and multiple quantum well (MQW) structures of low antimony content (Sb = 3.7 – 13.5 %) grown …
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Development of Iii-Nitride Non-Polar Leds and Self-Aligned Laser Structure
<p>Light Emitting Diodes (LEDs) are finding numerous applications in several commercial systems because they have unique properties. LEDs are more energy efficient, robust, small in size, very reliable and are sustainable in hazardous environmental conditions making them a good substitute for …
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High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System
This thesis presents an investigation into the characteristics of and driving methods for light emitting diode (LED) lamp system. A comprehensive overview on the lighting development is proposed. The characteristic of the light emitting diode (LED) lamp is described and the requirements of the …
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Growth, processing and chracterization of gallium nitride based coaxial LEDs grown by MOVPE
… coaxial (core-shell type) light emitting diodes (LEDs) offer a wide range of advantages. The active region of these LEDs is located on non-polar, {1-100} m-plane GaN sidewalls, which helps eliminate the quantum confined Stark effect (QCSE) and improve the radiative recombination efficiency of …
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HIGH TEMPERATURE ZnSe:Mn/ZnS NANOPHOSPHORS WITH VERY HIGH QUANTUM EFFICIENCY FOR WHITE LEDs
Efficient white LEDs are rapidly taking over many lighting and display applications, because of their improved color rendering and low power requirements. They are attractive replacements for traditional lighting from the point of view of both human perception and energy efficiency. Currently, the …
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Toward data-rich approaches to understanding colloidal semiconductor nanocrystals and quantum-dot LEDs
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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Properties of LEDs for the Calibration of PMTs for the Daya Bay Project
… with the use of carefully chosen and calibrated LEDs. This thesis details the study of several LEDs measured in an attempt to determine the properties of the most likely source for our calibration efforts. I measured the spectra of the LEDs meant for use in calibration, along with several others …
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Transmissão de sinais OFDM através de fibras ópticas poliméricas (POFs) utilizando LEDs de iluminação
… Multimode Polymer Optical Fibres) utilizando LEDs (Light Emitting Diodes) que não são otimizados para aplicações de dados. Este esquema representa uma interessante alternativa para o aumento da eficiência espectral do sistema tendo em vista que a banda passante dos emissores utilizados é muito …
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Enhancing the efficiency of organic LEDs through spin-orbit coupling of charge-transfer states
In this thesis, the possibility of enhancing the efficiency of small molecule organic light-emitting diodes through spin-orbit effects is examined. Because only singlet spin states, statistically one quarter of the total possible states, emit fluorescent light, it has generally been thought that a …
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