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 70 for “"emission properties"”.
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Emission properties of radiative chiral nematic liquid crystals
… We subsequently investigate the spontaneous emission properties, under the assumption that the electronic transition frequency is close to the photonic edge mode of the structure (resonance). We take into account the transition broadening and the decay of electromagnetic field modes supported …
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Multiwavelenght study of cluster mergers and consequences for the radio emission properties of galaxy clusters
… six merging clusters, which host extended radio emission on the cluster scale. A composite optical and X–ray analysis is performed in order to obtain a detailed and comprehensive picture of the cluster dynamics and possibly derive hints about the properties of the ongoing merger, such as the …
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The Effects of Cesium Deposition and Gas Exposure on the Field Emission Properties of Single Wall and Multiwall Carbon Nanotubes
The effects of Cs deposition on the field emission (FE) properties of single-walled carbon nanotube (SWNT) bundles were studied. In addition, a comparative study was made on the effects of O2, Ar and H2 gases on the field emission properties of SWNT bundles and multiwall carbon nanotubes (MWNTs). …
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The Interaction of Simple Gases with Hot Metal Filaments
… employed was observed using both thermionic emission and contact potential measurements and the most important factor determining the emission properties was found to be the formation of carbides by reaction of the metal with the methyl group. The physical and thermionic emission properties …
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Understanding colloidal quantum dot excitation with solution photon correlation fourier spectroscopy
… quantum dots (CQDs) have useful absorption and emission properties but exist in inhomogenous batches. Solution photon correlation fourier spectroscopy (S-PCFS) combines interferometry with fluorescence correlation spectroscopy (FCS) to measure the spectral correlation of the average single …
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Development of a room temperature molecular electronics: Direct vs indirect metal complex synthesis
… and CHN with a discussion of their UV/vis and emission properties included. The attempted synthesis of a series of dinuclear metal complexes, including two phenanthroline-thiophene type ligands (thimphen) using 3,5-bispyrid-2-yl-1,2,4- triazole as a bridging ligand is described in Chapter 5. A …
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Tuning the photophysical properties of amidophosphine complexes of copper
… complexes that allow for the tuning of the emission properties is reported. Luminescence lifetimes up to 150 [mu]s are observed in benzene solution at ambient temperature, which are comparable to the lifetimes of the longest-lived previously reported copper luminophores. These complexes also …
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Auroral arc detection using a COTS spectral photometer for the Auroral Emission Radio Explorer (AERO) CubeSat Mission
… are common, the aurora also have interesting emission properties at radio frequencies (RF), specifically in low-frequency and high-frequency bands. The Auroral Emission Radio Observer (AERO) is a 6U CubeSat, equipped with a novel electromagnetic Vector Sensor (VS) antenna. The VS will target …
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The Design, Synthesis and Characterization of Lanthanide-based Nanomaterials and Their Use in 3D Biological Imaging and Radiation Dosimetry
… for decades for their unique photophysical properties derived from their f-block orbitals. More recently, the prominence of techniques allowing for the study and characterization of nanoscale materials has led to a renewed interest in these materials on the nanoscale. This work has led to a …
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Synthesis and characterisation of mononuclear and dinuclear rhenium carbonyl complexes
… 295 - 360 nm region of the absorption spectrum. Emission was observed from all the complexes at 298 K and at 77 K. The absorption and emission properties of the pyridyl-triazole complexes were found to be pH dependent. The complexes underwent an irreversible Re(I)/Re(II) oxidation. The a-donor …
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Comparative study of zinc bis-quinolates and lithium mono-quinolates: Investigation of the effect of coordination geometry on electroluminescence performance
… charge injection efficiency and charge mobility properties are of equal importance. Substitution of the 8-quinolinolato ligand or substitution of different metal ions has been shown to shift absorption and emission energies, which can modify the relative energy level alignments of the HOMO and …
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Synthesis, Linear and Nonlinear Photophysical Characterization of Two Symmetrical Pyrene-terminated Squaraine Derivatives in Solution
… in addition to improving their optical properties. The absorption and emission properties of these derivatives were determined in order to gain an insight into the intensity of this type of interaction, their aggregation behavior and compare them with results obtained through quantum …
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Transverse polarization structure of parsec-scale radio jets
… radio jets play an important role in the emission properties and evolution of these objects; knowledge of the structure and evolution of these magnetic fields is therefore important in forming a better understanding of jets by imposing constraints on theoretical models and simulations. …
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Sustainable Development of New Phosphors for Photonics Applications
… the method of synthesis affects the crystalline properties of a phosphor material. Therefore, very important to use a technique that will not require post-synthesis annealing for high yield. Mechano-luminescence (ML) is the emission of light by a phosphor through a mechanical activity that was …
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Investigating self-assembly of linked oligomeric PPV-based materials
… controlled the extent of molecular ordering and emission properties. Comparison of the experimental results to molecular dynamics simulations performed by collaborators confirmed that the materials became increasingly ordered as conjugation length increased. Further regulation of the assembly can …
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Surface-emitting lasers for communications: novel metal-cavity microlasers and high-contrast-grating tunable VCSELs
… modeling of quantum-well and quantum-dot emission properties, as well as experimental characterization of their coupling with optical cavities, are presented. Lasing behavior of our designed and fabricated devices is demonstrated at room temperature under continuous-wave and pulsed …
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DNA nanotechnology for light-emitting plasmonic applications
… gaps. This allows for the investigation of the emission properties of individual molecules and their interaction with metals at a sub-nanometric scale. By combining DNA nanotechnol ogy with NPoMs, I demonstrate that utilising various DNA constructs as scaffolds results in different regimes of …
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Nano Vacuum Channel Devices for Electronics and Ultrafast Nanophotonics
… using metallic and refractory materials. Their emission properties in response to both electrical and optical fields are investigated through simulation and testing. Finally, their use for electronics and optoelectronics applications is demonstrated and discussed. In particular, this thesis …
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Alternating current electroluminescent properties of zinc sulfide powders
… the alternating current electroluminescent properties of zinc sulfide powders the following experiments were conducted: synthesis of zinc sulfide phosphors (comprised of zinc, sulfur and copper dopant); thermal shocking of phosphor materials (sudden cooling, using liquid nitrogen, of …
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