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.
Results
Showing 1 to 17 of 17 for “"UV LED"”.
-
Reduced Defect Density Nalgan Template Layer for Improved Output Deep-UV LED
<p>This dissertation focuses on improving deep ultraviolet light emitting diodes, by improving the base nAlGaN layer upon which the device layers are grown. The AlN buffer layer, superlattice strain-relieving layer and nAlGaN layer are sequentially and systematically optimized. Rough/Smooth AlN …
-
HIGH POWER ALGAN BASED DEEP UV LED LAMPS: DESIGN, FABRICATION AND CHARACTERIZATION
… and emerging medical instrumentation. Current UV-LEDs are limited in the market penetration due to the relatively low output power and quantum efficiency despite their inherent benefits of low cost, small size, and low power consumption.</p>
-
Mechanical design of optics bench for UV-LED based liquid chromatography detector
… that uses Ultraviolet Light Emitting Diodes (UV-LEDs) as the light source as opposed to currently used deuterium lamps required new design of the mechanical and structural components associated with it. The optics bench assembly is the heart of the detector system on which the detector optical …
-
MOVPE growth and characterization of Al(Ga)N and InAlN/AlGaN quantum wells for UV LED applications
… in the production light emitting diodes (LEDs) and laser diodes (LDs) over the past two decades. Last year, the Nobel Prize in Physics was awarded jointly to Isamu Akasaki, Hiroshi Amano and Shuji Nakamura for inventing a new energy efficient and environmental friendly light source: blue …
-
MultiFab : a multi-material 3D printing platform
… subsystems, including novel material feeding and UV LED curing systems. Additionally, results show that the printer is capable of producing multi-material parts for a wide variety of applications..
-
Design, fabrication and characterisation of ultraviolet light-emitting diodes for biomedical applications
The efficiencies of ultraviolet (UV) light-emitting diodes (LEDs) significantly lag behind those of their blue counterparts, owing to a variety of electrical and optical challenges. There is a marked dip in performance in the wavelength range ∼320 − 340 nm, due to the difficulty in realising a high …
-
Development of a motion-free tomographic imaging system
… on an electron amplifier. When illuminated by a UV LED, this photocathode emits a beam of electrons, with a maximum beam current of up to 500 uA per amplifier. The produced electrons are then accelerated through a high voltage to a tungsten target. These sources are individually addressable and …
-
Culicoides smulkiųjų mašalų (Diptera: Ceratopogonidae) mitybos analizė /
… between June and September 2022-2023 using UV LED‐light traps. The blood meal source of biting midges was identified using a PCR protocol that amplifies a fragment of the cytochrome b gene of vertebrates. Sequencing analysis showed that these insects took blood meals in birds most abundantly …
-
Aluminium nitride (AlN) as buffer layer for deposition of gallium nitride (GaN) thin films on silicon substrates using magnetron sputtering technique
… of GaN-based ultraviolet light-emitting diodes (UV-LEDs) are difficult to achieve highly crystalline GaN because lack of suitable substrates available and needed for high-temperature deposition process. Hence, the present research is focused on the enhancement of AlN as a buffer layer for the …
-
UV Laser and LED Induced Fluorescence Spectroscopy for Detection of Trace Amounts of Organics in Drinking Water and Water Sources
A UV Laser Induced Fluorescence (LIF) system, previously developed in our laboratory, was modified and used for a series of applications related to the development and optimization of UV LIF spectroscopic measurements of trace contaminants in drinking water and other water sources. Fluorescence …
-
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 …
-
Nanomaterials and photonic solutions. Novel ‘at source’ approaches to stop hospital-derived priority substances reaching the sewer network.
… wastewater. In this study a novel photocatalytic UV-LED-driven flow-through treatment concept was developed and evaluated for its ability to effectively destroy and inactivate a mixture of hospital-relevant test drugs: amoxicillin, paracetamol, tamoxifen, methotrexate and simvastatin. …
-
Quantum dot polymer composite materials for light management in optoelectronic devices
… including photovoltaic concentrators and LED display modules. Semiconductor nanocrystals, also known as quantum dots (QDs), serve as the pivotal luminescent materials in these devices. A quantum dots encapsulation method was developed here to homogeneously disperse QDs in a transparent …
-
Structural and Morphological Analyses of Aln and Algan Layers
<p>III-nitride semiconductors based Deep UV LEDs are the prospective candidates to replace the traditional UV sources, such as mercury vapor lamps, used in the applications of water and air purification, germicidal and biomedical instrumentation systems and others. Due to the lack of native …
-
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 …
-
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 …
-
TOWARD A BETTER CLEANING AND SELECTIVITY IN ELECTROANALYSIS: TIO2-BASED SENSORS AND ENANTIOSELECTIVE MATERIALS
… antibiotic. Titanium dioxide was coupled with gold nanoparticles (AuNPs) to enhance its signal and with mesoporous silica to increase the selectivity of the devices. At first, the focus was on the study of the aging time of the titanium dioxide sol and how it influences the …