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 20 for “"photoluminescence excitation"”.
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Photoluminescence studies of carrier dynamics in (indium(x),aluminum(x)) gallium(1-x) arsenic/gallium arsenide quantum well structures
… semiconductor quantum well structures probed by photoluminescence techniques in In$\sb{\rm x}$Ga$\sb{\rm 1-x}$As/GaAs and Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As/GaAs quantum well systems. Photoluminescence is a useful nondestructive probe of direct-gap quantum structures because the exciton population …
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Broad Band Excitation of Rare-Earth Dopants in Chalcogenide Glasses
Photoluminescence characterization has discovered a novel broad bands excitation effect in rare earth-doped chalcogenide glasses. Photoluminescence excitation (PLE) bands with a width of $\sim$450 nm have been observed which efficiently excite a number of rare earth emission lines. This effect is …
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Broad excitation of rare earth dopants in chalcogenide glasses
Photoluminescence characterization has discovered a novel broad band excitation effect in rare earth-doped chalcogenide glasses. Photoluminescence excitation (PLE) bands with a width of ~450 nm have been observed which efficiently excite a number of rare earth emission lines. This effect is …
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Large-Scale Characterization of Quantum Emitters in High-Purity Diamond
… of both emitters. We then demonstrate widefield photoluminescence excitation microscopy as a tool to multiplex the characterization of color center optical properties, and apply it to measure the optical properties of silicon vacancies in a sample implanted with a focused ion beam. These …
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The Study of Coupling in InGaAs Quantum Rings Grown by Droplet Epitaxy
… quantum dot pairs. In this thesis, we have used photoluminescence (PL) and photoluminescence excitation (PLE) to examine the possibility of energy transfer and coupling between quantum dot pairs in a single InGaAs quantum ring grown by droplet epitaxy. Power dependent photoluminescence spectra …
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Optical studies of III-V quantum wires grown by strain induced lateral ordering (SILO) process
… driven self-ordering process. Fourier transform photoluminescence (FTPL) measurements have been employed to study the polarization anisotropy in the emission from these structures. Photoluminescence power dependence and photoluminescence excitation spectroscopy is used along with the FTPL results …
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Design and analysis of solar cells by coupled electrical - optical simulation
… parameter extraction using Time-Resolved Photoluminescence (TRPL) and Photoluminescence Excitation Spectroscopy (PLE). Overall, this thesis work has created a new simulation tool for advanced photovoltaic devices based on the self-consistent coupling of wave optics with electronic …
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Engineering the optical quality of quantum emitters in WSe₂
… them through device engineering and alternative excitation regimes. In this thesis, I demonstrate devices with optimised design to produce stable emitters leading to reduced spectral wander. I realise this by encapsulating the monolayer in hBN, or by suspending the monolayer. This supports the …
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Optical Characterization and Evaluation of Dye-Nanoparticle Interactions
… become equivalent to the frequency of the excitation light; for films this required a specific geometry. Metallic nanoparticles have also interested researchers because of their unique optical properties. Depending on the metal, observations of quenching as well as fluorescence enhancement …
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Optical Properties of Rare-Earth Doped YBO3 Phosphor Materials
… electron microscope-cathodoluminescence, photoluminescence, photoluminescence excitation, and Raman spectroscopy techniques. The different microstructures of YBO3:Eu3+ have synthesized with hydro(solvo)thermal technique using different molar ratios of starting precursors and solvents. The …
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Ultrafast Dynamics of Individual Air-Suspended Single-Walled Carbon Nanotube
… applications. Since the discovery of band gap photoluminescence from isolated semiconducting SWCNTs, significant progresses in studying the optical properties of SWCNTs have been made (e.g. linear polarization along the tube axis for the absorption and emission of light, excitonic nature in …
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Surface Passivation of Colloidal II-IV Semiconductor Quantum Belts and Quantum Wires: Synthesis, Mechanism and Optical Studies
… previous disappointing QE: < 0.01 %). Enhanced photoluminescence: PL) emission reveals intrinsic higher and lower emission bands for CdTe QWs. Enhanced photoluminescence excitation: PLE) features consistently match previous theoretical calculations for electronic transitions. Significantly high …
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Photsluminescence of ZnO: Radioactive ion-implantation and transition metal defects
… thesis, implantation of radioactive isotopes and photoluminescence studies were used to identify defects in ZnO. Implantations of stable and radioactive isotopes of gallium and zinc were performed. From photoluminescence studies of these samples, a feature at 3.3600 eV was shown to be due to …
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Semiconductor nanocrystal colloids : manganese doped cadmium selenide, (core)shell composites for biological labeling, and highly fluorescent cadmium telluride
… from fluorescence line narrowing (FLN) and photoluminescence excitation (PLE) spectroscopies show that doped nanocrystals behave as if they were undoped nanocrystals in an external magnetic field. The nanocrystal surface is initially passivated by dative organic ligands. Better passivation …
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Modified chalcogenide glasses for optical device applications
… bands at 580, 730 and 1155 nmidentified by photoluminescence excitation measurements. Broad photoluminescence,with a full width half maximum of ~500 nm, is observed peaking at 1500 nm whenexciting at 514, 808 and 1064 nm. The fluorescence lifetime and quantum efficiency at300 K were measured …
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Optical characterization of copper indium gallium diselenide thin films
… which limit device performance. This study used photoluminescence (PL) spectroscopy, photoluminescence excitation (PLE) spectroscopy, and cathodoluminescence (CL) to study radiative emissions from a variety of Cu-poor CIGS thin films. Three general types of CIGS films were analyzed. …
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Investigation of exciton dynamics and electronic band structure of InP and GaAs nanowires
<p>In this study we used Photoluminescence (PL), Time-resolved photoluminescence (TRPL) and Photoluminescence excitation (PLE) spectroscopy to investigate optical and electronic properties of individual Zincblend GaAs/AlGaAs core-shell and Wurtzite InP nanowires (NWs) at low temperatures …
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Applications of Spectrally-Resolved Photoluminescence in Silicon Photovoltaics
… is devoted to measuring and interpreting the photoluminescence spectra emitted from different structures in crystalline silicon wafers and solar cells. Based on the knowledge accumulated, it also establishes a variety of applications of photoluminescence spectroscopy in silicon photovoltaics. …
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Applications of Spectrally-Resolved Photoluminescence in Silicon Photovoltaics
… is devoted to measuring and interpreting the photoluminescence spectra emitted from different structures in crystalline silicon wafers and solar cells. Based on the knowledge accumulated, it also establishes a variety of applications of photoluminescence spectroscopy in silicon photovoltaics. …
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Energetics and Dynamics in Quantum Confined Semiconductor Nanostructures
… significant absorption cross sections, and high photoluminescence quantum yields make these nanostructures promising moieties for use in optoelectronic devices, solar concentrators, chemical sensors, and biological labels. The variable dynamics of the electron-hole pairs that occur within …