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 13 of 13 for “"Blue LED"”.
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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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Towards the efficiency limit of visible light-emitting diodes
… the efficiency of visible light-emitting diodes (LEDs) for high-power operation. By leveraging this special mode of solid-state lighting by incoherent electroluminescent radiation and with the focus on gallium-nitride (GaN) technologies, we experimentally demonstrate a thermally enhanced blue LED …
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GaN Complementary-Metal-Oxide-Semiconductor (CMOS) Technology
… Prof. Shuji Nakamura for the invention of the blue LED which enabled ubiquitous white lighting. The key innovative technology that underpinned the invention of blue-LED is the efficient doping of GaN with p-type dopants. For years p-GaN has been used only in optoelectronic devices such as LEDs …
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Commercialization of Quantum Dot White Light Emitting Diode technology
It is well known that the use of high-brightness LEDs for illumination has the potential to substitute conventional lighting and revolutionize the lighting industry over the next 10 to 20 years. However, successful penetration of this extremely large lighting market would require vast improvements …
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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 …
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Designing a wireless underwater optical communication system
… In this thesis, optical communication using LEDs is presented as an improvement over acoustic modems for scenarios where high speed, but only moderate distances, is required and lower power, less complex communication systems are desired. A super bright blue LED based transmitter system and a …
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Late stage 18F-difluoromethylation of N-heteroaromatics
… is organic and produces a CHF2 radical under blue LED irradiation, based on previous reported publications. The fluorine-18 labeling of the Hu’s reagent was performed by Agostinho Lemos, in collaboration with the University of Liège (ULG). Meanwhile, the difluoromethylation of …
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Sound-induced micromechanical motions in an isolated cochlea preparation
… is left intact. Illumination is provided with a blue LED coupled to an optical fiber. The fiber is positioned next to the bone surrounding scala tympani of the apical turn, so that the organ of Corti is illuminated from below. The resulting optical access allows imaging of a variety of structures …
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Studies of measurement techniques for indirect chemical sensing based on fluorescence spectroscopy and applications for fibre-optic sensors
… order a few microseconds. The studies have enabled optimised design of interrogators for sensing oxygen using a fluorescent polymer encapsulated ruthenium complex. Two basic interrogation methods were explored, using blue LED excitation.<br/>The Rapid Lifetime Detection (RLD) scheme, a …
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EXTRATO E ÓLEO DE CAFÉ VERDE: FITOQUÍMICA, DESENVOLVIMENTO DE SISTEMAS NANOESTRUTURADOS E AVALIAÇÃO IN VITRO DO POTENCIAL ANTIMICROBIANO ASSOCIADO À TERAPIA FOTODINÂMICA
… high-performance liquid chromatography, both coupled with mass spectrometry. Microemulsions were prepared using the low-energy emulsification method, containing green coffee oil and extract, stabilized by surfactants. The in vitro antimicrobial potential of the developed microemulsion system and …
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SYNTHESIS OF POLYMER STRUCTURES FOR INCREASING ENERGY CONVERSION IN SOLAR CELLS
… direction. I adopted photolithography with a blue LED to polymerize the waveguides. This is a high-speed, low-cost process to fabricate large area waveguides. The photopolymerization with oxygen inhibition is understood. The relation among pillar height v.s. light intensity and film thickness …
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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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Phylogenetic and physiological characterization of deep-biosphere microorganisms in El’gygytgyn Crater Lake sediments
… restricted to marine ecosystems, while our knowledge about the microbial communities in the deep subsurface of lake systems and their potentials to adapt to changing environmental conditions is still fragmentary. This doctoral thesis aims to build up a unique data basis for providing the first …