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 22 for “"tunable emission"”.
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Perovskite Light-emitting Diodes with Tunable Emission
… of various size and shape. Halide perovskite has tunable colour emission, low disorder and is solution processable making it one of a popular choice as emitters. This thesis demonstrates the versatility of using halide perovskite material in light-emitting diodes. We demonstrate the first working …
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Tunable emission from two-dimensional semiconductor with platelet optical antennas
… the possibility of tuning the spontaneous emission of monolayer MoS 2 by coupling it with plasmonic platelet antennas, which can both convert freely propagating light into nanoscale and transmit radiation power into free space efficiently. The antennas used are single crystalline and the …
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Cd3P2 Quantum Dots As Sources for Quantum Emission and Detection of Near-IR Radiation
… on quantum dots (QDs) has grown due to their tunable emission and absorbance over a wide range of radiation. However, literature has prioritized researching QDs with band gaps in the visible region as a result of both instrumentation and synthetic challenges. The near-IR region is of …
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Low threshold organic and quantum dot nanobeam lasers
… for visible lasers due to their broad, tunable emission and deposition using fabrication techniques of low complexity. These materials have been used to demonstrate low lasing thresholds, and we hope to improve upon them with a novel design, paving the way towards electrically pumped and …
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Theory and fabrication of evanescently-coupled photoluminescent devices
… the feasibility of efficient, spectrally tunable lighting devices through quantum dot photoluminescence. Devices that enjoy both great efficiencies and excellent color temperatures are the goal of current lighting research. They are a "have your cake and eat it too," achievement that are …
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Hybrid light emitting diodes based on solution processed polymers, colloidal quantum dots, and colloidal metal nanoparticles
… high substrate compatibility, as well as tunable emission wavelength of the quantum dot materials. However, the application of these novel solution processed materials based devices is still limited due to their low performances. Material properties and fabrication parameters need to be …
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Photonic crystal emitters in heterogeneously bonded membranes
… is due to their small size, lithographically tunable emission wavelength, and potential for low power operation. In order to be practical, PhC membrane lasers must operate continuous wave (CW) under electrical injection at room temperature and be manufactured by reproducible methods. To date, …
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Charge and exciton dynamics in quantum dot light-emitting diodes
… offer the possibility of bright, saturated, and tunable emission for the next generation of display and solid state lighting technologies. In this thesis, we study how the interplay of charges and excitons in a QD-LED affect its operational behavior. In order to construct a physical model of a …
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Exciton and Energy Transfer Dynamics in Hybrid Perovskite and Lanthanide Nanomaterials
… stood out from other semiconductors due to their tunable emission properties, ease of fabrication and device integration. Some perovskite nanostructures, e.g. self-assembled hybrid perovskite quantum wells (PQWs) and CsPbX3 nanoparticles, show interesting excitonic properties and enhanced …
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Efficiency loss mechanisms in colloidal quantum-dot light-emitting diodes
Saturated and tunable emission colors make colloidal quantum-dot light-emitting diodes (QD-LEDs) interesting for the next generation of display and lighting technologies. However, there still remain various hurdles to the commercialization of QD-LEDs, including their relatively low external quantum …
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Active and Fast Tunable Plasmonic Metamaterials
Active and Fast Tunable Plasmonic Metamaterials is a research development that has contributed to studying the interaction between light and matter, specifically focusing on the interaction between the electromagnetic field and free electrons in metals. This interaction can be stimulated by the …
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Nonthemal plasma synthesis of indium phosphide nanocrystals and electrical properties of doped silicon nanocrystal films.
… a ZnS shell was grown around the InP NCs, size-tunable emission from the blue-green to the red was observed. Quantum yields as high as 15% were observed with this synthesis route. This route allows for synthesis of free-standing NCs that can be easily manipulated with colloidal based techniques …
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Rare-Earth Nanoparticles for Non-invasive In Vivo Imaging of Immune Cells in Cancer Immunotherapy
… of deep tissue structures. They have narrow and tunable emission bands in regions of near-zero tissue autofluorescence (1300-1700nm), large anti- Stokes shift enabling clear separation of excitation and emission wavelengths, high photostability for continuous and repetitive imaging, and very low …
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Analyte sensing with luminescent quantum dots.
… and potential applications. Their narrow size-tunable emission spectra, broad absorption spectra, resistance to photobleaching and long fluorescent lifetimes make them ideal for sensing ions and small molecules. This thesis explores the potential of QDs to function as the emissive unit in …
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Quantum dot polymer composite materials for light management in optoelectronic devices
… yield, minimal overlap between absorption and emission, and a narrow emission spectrum. We have examined the performance of LSCs utilizing CdSe/CdS core-shell QDs, with significantly reduced absorption-emission overlap and long propagation distances in the waveguide. Furthermore, a distributed …
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Silicon Nanowires the Route from Synthesis towards Applications
… to the observation of room temperature light emission from Si. According to quantum confinement theory, the emission wavelength can be red-shifted by tuning the NW diameter opening the routes towards low-cost, Si-based photonics. Moreover, the realization of innovative multiwavelength light …
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Capillary electrophoresis instrumentation and applications for the analysis of neural systems
… laser with 224 nm output for excitation and a tunable emission detection system using a spectrometer and photomultiplier tube, all relatively low-cost components. The system demonstrated excellent linearity over several orders of magnitude of concentration and intraday precision of 1–11% …
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Synthesis and characterization of infrared quantum dots
… narrow gap semiconductor that can form QDs with tunable emission between 530nm and 2000nm. I developed a synthetic strategy to precisely control the size of Cd3As 2 QDs while maintaining a narrow size distribution. Continuous precursor injection was used to drive growth and suppress size …
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Understanding cell decision-making using near-infrared quantum dots: One cell, one molecule at a time
… (~10-100 fold brighter than organic dyes), tunable emission wavelength (400 nm to the infrared), and extreme stability. In the first part of my thesis, I optimized the bioconjugation, size, and emission wavelength of QDs to achieve a compact and highly specific probe to detect single …
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Engineering the couplings to the continuum : controlling the fundamental properties of radiation and enabling forbidden light-matter
… (as high as E5), multi-photon spontaneous emission, and intercombination processes such as spin-flip phosphorescence transitions. We find that plasmon polaritons in graphene can speed up spin-flip phosphorescence process by 7 orders of magnitude, that they can speed up two-photon …
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