Dissertations / Theses on the topic 'Luminescence spectroscopy'
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Kallir, Alan J. "Total luminescence spectroscopy /." [S.l.] : [s.n.], 1986. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7960.
Full textAppelbaum, Ian 1977. "Ballistic electrons : microscopy, spectroscopy, devices and luminescence." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29612.
Full textIncludes bibliographical references (leaves 139-147).
This thesis describes research to theoretically model and experimentally measure electronic systems which employ ballistic electron emission. First, a Monte-Carlo framework for simulating electron injection from a tunnel junction emitter into a semiconductor collector is presented in detail and a few applications of this theory are described. Second, a method of treating ballistic electron transport through nano-scale heterostructures by considering realistic, atomic-scale periodic potentials is examined. Third, experimental results toward development of a novel scanning-probe microscopy for the local study of buried luminescent heterostructure layers is presented. Finally, a number of future research directions suggested by these results are described.
by Ian Appelbaum.
Ph.D.
Alexeev, Evgeny. "Hot-carrier luminescence in graphene." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18231.
Full textHackenberg, Wolfgang. "Hot electron luminescence spectroscopy in GaAs and InP." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309213.
Full textWhitfield, Claire Margaret Frances. "Investigation of cavitating flow luminescence for analytical spectroscopy." Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3464.
Full textFriis, Henrik. "Luminescence spectroscopy of natural and synthetic REE-bearing minerals." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/756.
Full textPaski, Edgar Francis. "Inorganic powder analysis by time-wavelength resolved luminescence spectroscopy." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29045.
Full textScience, Faculty of
Chemistry, Department of
Graduate
Lopinski, Stefan. "Circularly polarised luminescence spectroscopy of chiral europium (III) complexes." Thesis, University of Glasgow, 2003. http://theses.gla.ac.uk/2816/.
Full textClark, Brian John. "Computer-aided studies on luminescence spectroscopy in pharmaceutical analysis." Thesis, Heriot-Watt University, 1985. http://hdl.handle.net/10399/1658.
Full textBowmar, Paul. "Optical spectroscopy of novel materials." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259758.
Full textJalkian, Rafi Diran. "The evaluation and the application of array detectors for analytical luminescence spectroscopy." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184782.
Full textWilliams, Mark. "Uranium(VI) uptake by geological materials, characterisation by luminescence spectroscopy." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/uraniumvi-uptake-by-geological-materials-characterisation-by-luminescence-spectroscopy(0220200d-b14b-4ef2-99e0-8d0342701576).html.
Full textTogay, Evren. "Design And Implementation Of A Luminescence Emission Spectrometer." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614144/index.pdf.
Full textcold emission&rdquo
other than the blackbody radiation. Spectroscopy involves the measurement of intensity of emitted, absorbed or scattered electromagnetic radiation as a function of wavelength. Thus, it is a valuable tool in the study of understanding the luminescence production mechanisms. Measurement of emission spectra gives information about the energy levels of transition and structure, geometry and composition of the sample. In this study, a versatile luminescence emission spectrometer was designed and developed with the main aim of measuring Photoluminescence (PL), Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) emission spectra of materials relevant for dosimetry. The spectrometer was constructed around a Littrow type monochromator by developing the necessary hardware, firmware and software. Wavelength calibration, measurement of spectral response and determination of resolution of the spectrometer were done using calibration lamps and a calibrated spectroradiometer. Finally the performance of the constructed spectrometer was tested by measuring the emission spectra of materials such as BeO, Al2O3 and CaF2 wherever possible the measured spectra were compared with the ones reported in the literature.
Mather, Anne. "Applications of luminescence techniques to the analysis of multicomponent systems." Thesis, Heriot-Watt University, 1987. http://hdl.handle.net/10399/1048.
Full textLucas, David M. "Luminescence studies of polymer behaviour in the solution and solid states." Thesis, Lancaster University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334750.
Full textBarrera, Bello Elixir William. "Lanthanide-based dielectric nanoparticles for upconversion luminescence." Doctoral thesis, Universitat Rovira i Virgili, 2013. http://hdl.handle.net/10803/108960.
Full textNowadays especially attention has been given to materials capable of generating visible light by conversion of near infrared photons (upconversion) for save-energy technologies and reduction of photo-degradation caused by UV high energy photons. Nanoparticles using optically active Ln3+ have shown great potential for use as upconverting luminescent materials in bio-analysis applications, counterfeit fighting and back-lighting. However materials with nanometer dimensions may affect the luminescence dynamics of the Ln3+ ion modifying the emission lifetime, quantum yield, and concentration quenching. This thesis discusses the synthesis and upconversion emission of lanthanide doped nanostructures with Lu2O3 and KLu(WO4)2 as host because they posses high chemical stability; they offer favorable incorporation of Ln3+ ions and high absorption and emission cross sections. Er3+, Ho3+ and Tm3+ are used as emitting ions and Yb3+ as sensitizer. Luminescence dynamics of these ions into these nanostructures and the possibility of white light emission in KLuW nanocrystals are discussed.
Potter, Mark David George. "Luminescence spectroscopy of CdTe/CdS based photovoltaic devices and associated materials." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4607/.
Full textGelamos, João Paulo [UNESP]. "Desenvolvimento e aperfeiçoamento de protocolos de conjugação de nanomarcadores luminescentes com sistemas biológicos para aplicação em imunoensaios." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/97762.
Full textUniversidade Estadual Paulista (UNESP)
Neste trabalho foram desenvolvidos e aprimorados protocolos de conjugação entre nanopartículas do luminóforo Y2O3:Er,Yb, aminofuncionalizadas e a proteína Streptavidina, para atuarem como marcador em imunoensaios. A streptavidina faz parte do sistema de auto-reconhecimento biotina-avidina mais aplicado em ensaios biológicos, sendo que, devido ao seu alto custo, a Albumina Sérica Bovina foi escolhida como proteína de trabalho em substituição à Avidina. Na etapa final, no entanto, utilizou-se a Streptavidina para comparativamente finalizar as discussões. Desta forma, o desenvolvimento do protocolo considerado padrão foi feito aplicando-se o crosslinker homobifuncional glutaraldeído, e a partir deste, estudou-se o comportamento da ligação luminóforo-proteína utilizando-se outros crosslinkers heterobifuncionais, no caso sulfo-N-succinimidil 4-maleimido- butirato sal de sódio (Sulfo-GMBS) e cloridrato de N-(3-dimetilaminopropil)-N'-etilcarbodiimida (EDC). Tal alteração teve como princípio o aperfeiçoamento do protocolo de conjugação, estabelecendo comparativos entres os dados experimentais já obtidos e as possíveis vantagens resultantes dos crosslinkers heterobifuncionais, já que neste caso a possibilidade de ocorrer autoconjugação, ligação cruzada intramolecular e/ou polimerização entre as nanopartículas aminofuncionalizadas pode ser nula. Com relação às nanopartículas, estas, antes da conjugação, foram caracterizadas por espectroscopia de luminescência, microscopia eletrônica de varredura e/ou transmissão, assim como titulação potenciométrica para quantificação dos grupos NH2 após funcionalização. No desenvolvimento e aperfeiçoamento dos protocolos de conjugação todas as etapas foram monitoradas por Espectroscopia de Absorção na Região...
In this work conjugation protocols between the aminofunctionalized nanophosphor Y2O3: Er, Yb, and the protein Streptavidin was developed and improved to be possible applied as markers in immunoassays. The Streptavidin is part of the biotin-avidin self-recognition system applied to most biological assays, and, due to its high cost, Bovine Serum Albumin protein was chosen to be used in most part of the developing protocol as a substitute for avidin. In the final step, however, the Streptavidin was used in comparison to the other results in order to finalize the study. Thus, the development of the standard protocol was done by applying the homobifunctional crosslinker glutaraldehyde, and from this, it was studied the behavior of protein-nanophosphors binding using the heterobifunctional crosslinkers N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC) and Sulfo-N-succinimidyl 4-maleimidobutyrate sodium salt (Sulfo-GMBS). Such a change had the challenge to improve conjugation protocol, establishing the comparison between experimental data already obtained and the possible advantages due to the use of heterobifunctional crosslinkers, considering that in this case the possibility of occurring self-conjugation, intermolecular crosslinking and/or polymerization between the aminofuctionalized nanoparticles can be null. With respect to the nanoparticles before the conjugation step, they were characterized by luminescence spectroscopy, scanning and/or transmission electron microscopy as well as potentiometric titration for NH2 groups quantification after functionalization. During the development and the improvement of the conjugation protocols all steps were monitored by UV-VIS absorption spectroscopy to verify the behavior of molecular species present before and after the reactions... (Complete abstract click electronic access below)
Adegoke, Oluwasesan. "The design of quantum dots and their conjugates as luminescent probes for analyte sensing." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1010866.
Full textMcCormick, James Patrick. "Computer-aided luminescence spectroscopy of some nitrogen heterocycles : the development of novel computer-aided techniques in luminescence spectroscopy, applied to nitrogen heterocycles of medicinal interest to maximise the specificity of analysis." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328026.
Full textAlexander, Sally Anne. "The stability of the remnant luminescence emissions of alkali feldspar." Thesis, Connect to e-thesis, 2007. http://theses.gla.ac.uk/1001/.
Full textPh.D. thesis submitted to the Department of Geographical & Earth Sciences, University of Glasgow, 2007. Includes bibliographical references. Print version also available.
Hindson, Benjamin Joseph, and mikewood@deakin edu au. "The Chemistry, spectroscopy and analytical applications of certain chemiluminescent reactions." Deakin University. School of Biological and Chemical Sciences, 2001. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20051017.114704.
Full textDuarte, Adriana Pereira [UNESP]. "Híbridos luminescentes à base de sílica e complexos de európio: ferramenta para análise em meio biológico." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/105791.
Full textEste trabalho apresenta a síntese, caracterização e estudo das propriedades de fotoluminescência de híbridos à base de sílica e complexos európio (III). Estes híbridos, também, foram funcionalizados e testados como sondas ou biomarcadores. A associação do íon európio à matrizes inorgânicas (alumina, sílica) e orgânicas (PMMA), tem sido amplamente estudada. Entretanto, o estudo de diferentes metodologias de síntese são ainda necessárias para otimizar propriedades físico-químicas, incluíndo as propriedades luminescentes destes materiais. Neste sentido, a presente tese propõe a síntese de dois novos luminóforos à base de sílica, via ligação covalente de complexos de Eu3+ à matriz, impedindo, desta forma, processos indesejados de lixiviação. Estes novos complexos de európio (III) devem apresentar ligantes com função alcooxisilanos, e uma estrutura eletrônica que possibilite a eficiente transferência de energia não radiativa (“efeito de antena”) Ligante ® Eu3+, otimizando propriedades luminescentes. Além do ligante bipiridina (Bpy-Si) já conhecido na literatura, desenvolvido no CIRIMAT-Toulouse, o novo ligante alcoóxi modificado b-dicetona (TTA-Si) foi sintetizado nessa tese, gerando neste trabalho uma família composta de três complexos de európio (III): [Eu(TMHD)3(Bpy-Si)], [Eu (TTA)3(Bpy-Si)] e [Eu (TTA-Si)3], que serão citados no texto sob as siglas [Eu1], [Eu2] e [Eu3], respectivamente. A ancoragem dos complexos superficialmente à sílica foi realizada sobre duas matrizes diferentes: primeiro, nanopartículas de sílica densas, 24 ± 2 nm (Ludox AS-40), e segundo, matrizes de sílica mesoporosas. A sílica mesoporosa foi sintetizada pela metodologia de pirólise de aerossol, um método (one step) capaz de produzir partículas mesoporosas em poucos minutos, sem resíduos de surfactante e...
Ce travail décrit la synthèse, la caratérisation et l’étude des propriétés de photoluminescence d’hybrides à base de silice et de complexes d’europium(III). Ces hybrides sont ensuite organiquement modifiés pour illustrer leur application potentielle en tant que sondes ou biomarqueurs. Associer les très bonnes propriétés de luminescence des complexes de lanthanides avec les propriétés physico-chimiques d’une matrice inorganique telle que la silice est une voie prometteuse pour l’obtention de nouveaux outils d’analyse pour la biologie. La silice, SiO2, est une excellente matrice inorganique qui, sous forme de particules submicroniques voire même nanométriques, puisqu’elle permet à la fois de concentrer le luminophore tout en le protégeant des perturbations externes susceptibles d’inhiber le processus de luminescence. De plus la modification de la surface des particules de silice via une fonctionnalisation par voie chimique rend ces nouveaux hybrides biocompatibles, adaptés à leur mise en suspension en milieu aqueux et donc intéressants pour l’analyse des milieux biologiques. Dans cette optique l’obtention de particules dont la taille reste inferieure à 100 nm est une condition qui s’impose et qui nécessite de développer de nouveaux hybrides organique-inorganiques. C’est dans ce cadre que se situe ce travail de thèse. Les lanthanides voient leurs propriétés de luminescence exaltées par la présence dans leur sphère de coordination de chromophores organiques. Depuis une dizaine d’années l’association de chélates d’europium(III) dans des matrices inorganiques (silice, alumine) et organiques (PMMA) a fait l’objet d’un très grand nombre d’études pour lesquelles les conditions de synthèse ne sont pas bien contrôlées conduisant à des hybrides... (Complete abstract click electronic access below)
Tyombo, Nolukholo. "Synthesis and Luminescence of Zinc Oxide Nanorods-Blended Thiopheno-Organosilicon Polymers." University of the Western Cape, 2017. http://hdl.handle.net/11394/6230.
Full textThe increasing cost of fossil fuel energy production and its implication in environmental pollution and climate change created high demand for alternative and renewable sources of energy. This has led to great interest in research in the field of photovoltaic or solar cells Due to the abundance of sunlight, the technology is sustainable, non-polluting and can be implemented at places where power demand is needed, for example in rural areas. Solar cell devices that have been commercialized are currently based on silicon technology, involving the use of monocrystalline, polycrystalline and amorphous silicon. Although they produce highly efficient solar cells, the cost of Si solar cells is too high. Second generation solar cell materials such as cadmium telluride and third generation materials such as perovskites and organic polymers have been receiving much attention recently. However, they lack the efficiency of Si solar cells. This research proposes the development of high energy conservation photovoltaic cells from novel low-cost organosilicon polymers. The aim was to develop novel highly branched organosilane polymers such as poly(3-hexythiophene), polydi(thien-2-yl)dimethylsilane, poly(3-hexyl- [2,2'] bithiophenyl-5-yl)-dimethyl-thiophen-2yl-silane) as electron donors along with zinc oxide nanorod as the electron acceptor which were able to bring the efficiency of the resultant photovoltaic cell close to that of current Si solar cell.
2021-08-31
Balogh, Margareta Cristina. "New luminescent materials, bio-inspired and recyclabe, based on lanthanide complexes." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEN039.
Full textThe objective of this project was to explore recyclable lanthanide based materials suitable for replacing the oxides from compact fluorescent lamps (CFLs). Lanthanides, particularly Eu¹¹¹ and Tb¹¹¹ have been the main “ingredients” in phosphors due to their colour purity and sharp emission in the red and green range of the visible spectrum. Lanthanide tris-dipicolinates are water soluble complexes, known for their excellent photophysical properties which makes them great candidates for lighting. The thesis describes the study of Eu¹¹¹ and Tb¹¹¹ tris-dipicolinate complexes in the crystalline form with different cations, as well as more complex systems like mixed co-crystals and core/shell crystals. The Eu¹¹¹ and Tb¹¹¹ complexes were also used as dopant in mesostructured silica materials via an incipient wetness impregnation method leading to homogeneous materials. The photophysical properties these different materials were thoroughly studied and a significant exaltation of the emission was evidenced in the silica. In particular, the influence of the O-X oscillators was explored and determination of the intrinsec quantum yield gave a clearer image on this exaltation. The recyclability of the lanthanide complexes from the material has been proven with high rates. Finally, white light emitting materials were obtained by mixing red, green and blue emitters. The naphthalimide moiety was chosen as blue emitter and white luminescence was successfully obtained in the solid state and for a silica material, representing a first generation of recyclable white light emitting materials based on lanthanide tris-dipicolinate complexes
Jayaraj, Balaji. "Correlating microstructural development and failure mechanisms to photo stimulated luminescence spectroscopy and electrochemical impedance spectroscopy in thermal barrier coatings." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4948.
Full textID: 029810158; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2011.; Includes bibliographical references (p. 213-217).
Ph.D.
Doctorate
Mechanical, Materials, and Aerospace Engineering
Engineering and Computer Science
Kisand, Vambola. "Creation of free excitons in solid krypton investigated by time resolved luminescence spectroscopy." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961700092.
Full textOr, Chun-tat. "Optical characterization of defects in GaN /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23768770.
Full textLedee, Ferdinand. "Cristallisation et fonctionnalisation de pérovskites hybrides halogénées à 2-dimensions pour le photovoltaïque et l’émission de lumière." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLN045/document.
Full textHybrid halide perovskites are new class of high-end semiconductors that combine high performances, low cost and low temperature proccessability for different application such as photovoltaics or light-emitting devices. Their large-scale commercialization is however hindered by their poor stability. For a few years, many groups started to grow interest in 2-dimensional (2D) hybrid perovskites. This subclass of perovskite is much more stable than their 3D counterparts, and offers more chemical flexibility. Yet their performances are limited by the bad quality of the spin-coated layers. Moreover an increase in the understanding of their intrinsic properties is necessary. This last point could be solved by the study of single crystals. We developped therefore a new anti-solvant, vapor-assisted crystallization (AVC) method for the growth of (PEA)2PbI4 and (PEA)2(MA)Pb2I7. Furthermore, a capped AVC process (AVCC) was developped for the growth of 2D perovskites single crystalline thin films. These films might help getting closer to the intrinsic limits of the material. We also synthesized new 2D luminophore-functionalized perovskite systems. The spectroscopic studies of this material highlighted a possible charge transfer between the two moities of the perovskite. This kind of perovskite could help improving the photovoltaic performances of 2D perovskite thanks to the splitting of the strongly bounded exciton
Gelamos, João Paulo. "Desenvolvimento e aperfeiçoamento de protocolos de conjugação de nanomarcadores luminescentes com sistemas biológicos para aplicação em imunoensaios /." São José do Rio Preto : [s.n.], 2011. http://hdl.handle.net/11449/97762.
Full textBanca: Marco Aurélio Cebim
Banca: Eduardo Alves de Almeida
Resumo: Neste trabalho foram desenvolvidos e aprimorados protocolos de conjugação entre nanopartículas do luminóforo Y2O3:Er,Yb, aminofuncionalizadas e a proteína Streptavidina, para atuarem como marcador em imunoensaios. A streptavidina faz parte do sistema de auto-reconhecimento biotina-avidina mais aplicado em ensaios biológicos, sendo que, devido ao seu alto custo, a Albumina Sérica Bovina foi escolhida como proteína de trabalho em substituição à Avidina. Na etapa final, no entanto, utilizou-se a Streptavidina para comparativamente finalizar as discussões. Desta forma, o desenvolvimento do protocolo considerado padrão foi feito aplicando-se o crosslinker homobifuncional glutaraldeído, e a partir deste, estudou-se o comportamento da ligação luminóforo-proteína utilizando-se outros crosslinkers heterobifuncionais, no caso sulfo-N-succinimidil 4-maleimido- butirato sal de sódio (Sulfo-GMBS) e cloridrato de N-(3-dimetilaminopropil)-N'-etilcarbodiimida (EDC). Tal alteração teve como princípio o aperfeiçoamento do protocolo de conjugação, estabelecendo comparativos entres os dados experimentais já obtidos e as possíveis vantagens resultantes dos crosslinkers heterobifuncionais, já que neste caso a possibilidade de ocorrer autoconjugação, ligação cruzada intramolecular e/ou polimerização entre as nanopartículas aminofuncionalizadas pode ser nula. Com relação às nanopartículas, estas, antes da conjugação, foram caracterizadas por espectroscopia de luminescência, microscopia eletrônica de varredura e/ou transmissão, assim como titulação potenciométrica para quantificação dos grupos NH2 após funcionalização. No desenvolvimento e aperfeiçoamento dos protocolos de conjugação todas as etapas foram monitoradas por Espectroscopia de Absorção na Região... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: In this work conjugation protocols between the aminofunctionalized nanophosphor Y2O3: Er, Yb, and the protein Streptavidin was developed and improved to be possible applied as markers in immunoassays. The Streptavidin is part of the biotin-avidin self-recognition system applied to most biological assays, and, due to its high cost, Bovine Serum Albumin protein was chosen to be used in most part of the developing protocol as a substitute for avidin. In the final step, however, the Streptavidin was used in comparison to the other results in order to finalize the study. Thus, the development of the standard protocol was done by applying the homobifunctional crosslinker glutaraldehyde, and from this, it was studied the behavior of protein-nanophosphors binding using the heterobifunctional crosslinkers N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC) and Sulfo-N-succinimidyl 4-maleimidobutyrate sodium salt (Sulfo-GMBS). Such a change had the challenge to improve conjugation protocol, establishing the comparison between experimental data already obtained and the possible advantages due to the use of heterobifunctional crosslinkers, considering that in this case the possibility of occurring self-conjugation, intermolecular crosslinking and/or polymerization between the aminofuctionalized nanoparticles can be null. With respect to the nanoparticles before the conjugation step, they were characterized by luminescence spectroscopy, scanning and/or transmission electron microscopy as well as potentiometric titration for NH2 groups quantification after functionalization. During the development and the improvement of the conjugation protocols all steps were monitored by UV-VIS absorption spectroscopy to verify the behavior of molecular species present before and after the reactions... (Complete abstract click electronic access below)
Mestre
Franke, Barbara. "Nondestructive Evaluation of Thermal Barrier Coatings with Thermal Wave Imaging and Photostimulated Luminescence Spectroscopy." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4088.
Full textM.S.M.E.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Materials Science and Engineering
Charles, Steven John. "Characterisation of irradiation damage and dopant distribution in synthetic diamonds by luminescence micro-spectroscopy." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393876.
Full textLegrand, Marie. "Advanced imaging of transient and spectral luminescence for optoelectronic characterization of photovoltaic materials." Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS066.pdf.
Full textPhotoluminescence characterization of photovoltaic absorbers provides the charge transport phenomena and the optoelectronic properties on which their performance relies. However, their obtention is based on physical models and may require uncontrolled assumptions and unknown parameters. This thesis explores how acquiring spectrally resolved maps of photoluminescence in pulsed excitation can contribute to material characterization while limiting the necessary prior knowledge and controlling underlying hypotheses and models. On the one hand, we developed imaging systems describing the emitted intensity in four dimensions: 2D spatial, temporal and spectral. On the other hand, we performed excitation wavelength variation studies and investigated their relationship with light absorption. Maps of intensity can be acquired by pixelated detectors or non-imaging detectors, as in Single-pixel imaging. This approach employs spatial light modulation to reconstruct images and is particularly relevant to obtain multidimensional images. It is thus of interest for photoluminescence as each dimension brings information, as demonstrated by the setups already in use. A hyperspectral imager, providing the spectrum in each pixel, allows the characterization of material properties and the charge carriers generated. Complementarily, time-resolved imaging gives an insight into the transport mechanisms. We review and propose different techniques to obtain 4D data corresponding to the temporal evolution of the spectrum in each pixel of an image I_PL (x,y,energy,time). It provides the correlation between temporal and spectral dimensions, which was not available in the lab previously. Three measurement approaches were developed based on the principle of single-pixel imaging. They correspond to different sampling schemes in the 4D space, focusing on temporal and spectral dimensions that are reached with high resolutions. Their implementation was challenging as photoluminescence corresponds to low light conditions, and the higher the resolutions, the lower the sensitivity. Each dimension of light involved must be accurately reconstructed while entangled in the acquisition process. Particularly, the impact of diffraction and interferences due to the spatial light modulator has been investigated. This instrumental work allowed, first of all, combined time and spectrally resolved imaging (2x3D) of perovskite. It allowed monitoring of light-induced mechanisms that modify the photoluminescence spectrum and dynamics. Secondly, it has led to the characterization in 4D of the emission of a gallium arsenide wafer. The joint evolution of the signal in temporal, spatial, and spectral dimensions is observed due to band-filling and diffusion. At last, a workflow based on pixel clustering algorithms is proposed. A spatial map is obtained by single-pixel imaging, from which areas of interest are determined before the decay is obtained with high temporal and spectral resolutions. It allows an original sampling of photoluminescence with a high signal-to-noise ratio enabling its application to various samples and injection conditions. These last two approaches are unique to the best of our knowledge and provide photoluminescence variation in the combined spatial, temporal, and spectral domains. In addition, we have set up a methodology to perform excitation wavelength studies on the hyperspectral imager. It was demonstrated on an inhomogeneous perovskite sample from which the local relative absorptivity is obtained on a wide spectral range by combined analysis of the emission and excitation spectra. Reflectivity measurements completing this study provide optical and topological information allowing us to refine the interpretation of photoluminescence maps
Fau, Amaury. "Spectroscopies Raman et de luminescence résolues en temps pour l'exploration de Mars." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS101.
Full textIn 2021, the NASA Mars 2020 rover will deploy the SuperCam instrument in the Jezero crater on Mars. This franco-american multi-tool instrument for remote analysis will be equiped with LIBS (chemical analysis) and with a time-resolved Raman and luminescence spectrometer (mineralogical analysis). After investigating various environmental parameters as well as intrinsic factors from the target sample, time-resolved Raman spectroscopy appears as a powerful tool to obtain high-quality Raman spectra free of parasitic signal (e.g. luminescence) for many mineral phases (carbonates, phosphates, silicates), even in the case of minerals hardly analysable with conventional Raman. A database of time-resolved Raman spectra has been elaborated. The effects of LIBS laser shots on the mineral structure and Raman fingerprint have been studied experimentally and through simple thermal modeling. Results show a major structural effect (vitrification and/or phase transition) in the case of opaque minerals with high optical absportion coefficient whereas the effects are minimal, or even non detectable, for more transparent and less absorbing minerals. Implications of these results for the operation of the Mars 2020 instruments are discussed. The study of Rare-Earth Elements (REE) luminescence in synthetic doped and natural apatites shows that luminescence is powerful to detect and characterize REEs. However, due to strong transfer energy among emission centers, the possible use of luminescence lifetime appears to be impossible to quantify REE in natural apatites
Jones, Debbie. "Fluorescence spectroscopy and microscopy as tools for monitoring redox transformations of uranium in biological systems." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/fluorescence-spectroscopy-and-microscopy-as-tools-for-monitoring-redox-transformations-of-uranium-in-biological-systems(e5420e94-b96e-4ee1-be63-1a3363672014).html.
Full textDuarte, Adriana Pereira. "Híbridos luminescentes à base de sílica e complexos de európio : ferramenta para análise em meio biológico /." Araraquara : [s.n.], 2012. http://hdl.handle.net/11449/105791.
Full textOrientador: Marie Joelle Menu
Banca: Oscar Manoel Loureiro Malta
Banca: Jean Olivier Durand
Banca: Luís Antonio ferreira Martins Dias Carlos
Banca: Eric Benoist
Resumo: Este trabalho apresenta a síntese, caracterização e estudo das propriedades de fotoluminescência de híbridos à base de sílica e complexos európio (III). Estes híbridos, também, foram funcionalizados e testados como sondas ou biomarcadores. A associação do íon európio à matrizes inorgânicas (alumina, sílica) e orgânicas (PMMA), tem sido amplamente estudada. Entretanto, o estudo de diferentes metodologias de síntese são ainda necessárias para otimizar propriedades físico-químicas, incluíndo as propriedades luminescentes destes materiais. Neste sentido, a presente tese propõe a síntese de dois novos luminóforos à base de sílica, via ligação covalente de complexos de Eu3+ à matriz, impedindo, desta forma, processos indesejados de lixiviação. Estes novos complexos de európio (III) devem apresentar ligantes com função alcooxisilanos, e uma estrutura eletrônica que possibilite a eficiente transferência de energia não radiativa ("efeito de antena") Ligante ® Eu3+, otimizando propriedades luminescentes. Além do ligante bipiridina (Bpy-Si) já conhecido na literatura, desenvolvido no CIRIMAT-Toulouse, o novo ligante alcoóxi modificado b-dicetona (TTA-Si) foi sintetizado nessa tese, gerando neste trabalho uma família composta de três complexos de európio (III): [Eu(TMHD)3(Bpy-Si)], [Eu (TTA)3(Bpy-Si)] e [Eu (TTA-Si)3], que serão citados no texto sob as siglas [Eu1], [Eu2] e [Eu3], respectivamente. A ancoragem dos complexos superficialmente à sílica foi realizada sobre duas matrizes diferentes: primeiro, nanopartículas de sílica densas, 24 ± 2 nm (Ludox AS-40), e segundo, matrizes de sílica mesoporosas. A sílica mesoporosa foi sintetizada pela metodologia de pirólise de aerossol, um método (one step) capaz de produzir partículas mesoporosas em poucos minutos, sem resíduos de surfactante e... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Ce travail décrit la synthèse, la caratérisation et l'étude des propriétés de photoluminescence d'hybrides à base de silice et de complexes d'europium(III). Ces hybrides sont ensuite organiquement modifiés pour illustrer leur application potentielle en tant que sondes ou biomarqueurs. Associer les très bonnes propriétés de luminescence des complexes de lanthanides avec les propriétés physico-chimiques d'une matrice inorganique telle que la silice est une voie prometteuse pour l'obtention de nouveaux outils d'analyse pour la biologie. La silice, SiO2, est une excellente matrice inorganique qui, sous forme de particules submicroniques voire même nanométriques, puisqu'elle permet à la fois de concentrer le luminophore tout en le protégeant des perturbations externes susceptibles d'inhiber le processus de luminescence. De plus la modification de la surface des particules de silice via une fonctionnalisation par voie chimique rend ces nouveaux hybrides biocompatibles, adaptés à leur mise en suspension en milieu aqueux et donc intéressants pour l'analyse des milieux biologiques. Dans cette optique l'obtention de particules dont la taille reste inferieure à 100 nm est une condition qui s'impose et qui nécessite de développer de nouveaux hybrides organique-inorganiques. C'est dans ce cadre que se situe ce travail de thèse. Les lanthanides voient leurs propriétés de luminescence exaltées par la présence dans leur sphère de coordination de chromophores organiques. Depuis une dizaine d'années l'association de chélates d'europium(III) dans des matrices inorganiques (silice, alumine) et organiques (PMMA) a fait l'objet d'un très grand nombre d'études pour lesquelles les conditions de synthèse ne sont pas bien contrôlées conduisant à des hybrides... (Complete abstract click electronic access below)
Doutor
Cousseau, Fabien. "Structuration et étude de luminescence à l’échelle du nano-objet unique." Thesis, Angers, 2018. http://www.theses.fr/2018ANGE0053.
Full textAzopolymer photo-isomerization causes matter motion. This phenomena is responsible for the inscription of the interference pattern on surface of thin films. The films are replicated by pouring PDMS on it. PDMS is a transparent and stretchable polymer. The diffraction pattern of these gratings describes the surface. These informations are used to numerically simulate the surface irrespective of the mechanical constraints.The WOLF project try to synthetize white lightorganic nanolasers. For that purpose, a complex setup has been realised. The excitation part of the setup illuminates a single nano-laser or a few. The pump source is designed to optimise the amplified emission of the nanolasers. The collection of the signal is based on an optical fiber.This fibre has given us the chance to use confocal microscopy. Spectroscopy combined with our setup show the existence of nanocavities among nanotubes. In spite of the low signal power, the emitting modes are studied and show the cavity effect of these lasers. In another context, nano-objets are sometimes studied in solution. For that reason, a new experiment has been setup, namely, microfluidic. Without the use of a clean room, a low cost photolithograpic method is developped. The microfluidic chips are tested during the mixing of to liquids and during the obsevation of the brownian motion of particules. This PhD thesis has given the tools needed for the characterization of single nano-objects
Curry, Richard James. "Luminescence characterisation of aluminium and erbium tris (8-hydroxyquinoline)." Thesis, Queen Mary, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312173.
Full textXia, Ruidong. "Spatial resolved luminescence spectroscopy investigation of defect emission and degradation of III-V semiconductor devices." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272880.
Full textWilliams, Diane Keith. "Particle Size Dependence on the Luminescence Spectra of Eu3+:Y2O3 and Eu3+:CaO." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/29719.
Full textPh. D.
Lannes, Anthony. "Chimie de coordination de radicaux nitronyl-nitroxyde pontants pour l’élaboration de matériaux magnétiques moléculaires : synthèse, structures cristallines, propriétés magnétiques et spectroscopie électronique." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10173/document.
Full textFor the past decades, electronics have been developed in order to meet the increasing need of information storage, always evolving to the constant upgrade of their components: better, faster, smaller. Twenty-five years ago, the recently created field of molecular magnetism allowed designing entities responding to the aforementioned requirements: Single- Molecule-Magnets (SMMs). On the one hand, those are compounds showing magnetic bistability affording to stock information and on the other hand, they are the smallest entities available to design any information support. In spite of those remarkable qualities, they require very low temperature (< 15 K) to display their properties. Thus, it is of primary importance to understand underlying mechanisms in order to increase this temperature range. One promising route is to connect lanthanide dimer by a radical bridge. This method has led to the discovery of a SMM, whose blocking temperature is the highest known to date (14 K). This thesis work has been dedicated to the conception of SMMs and molecular-based magnets, as well as the characterization of their structures and magnetic properties, and their magneto-structural relationships by electronic spectroscopy. Those systems were mostly based on lanthanide(III) or manganese(II) ion and nitronyl-nitroxide organic free radicals. A special focus was made to the synthesis of dinuclear lanthanide complexes bridged by an organic free radical, and to the study of their mononuclear complex. We have studied the potential of NITBzImH radical as a bridge for [Ln(β-diketonate)3] and [Ln(NO3)3] molecular bricks. We also took interest to the unusual magnetic behavior of a manganese(II) coordination polymer, where each metal center is bridged by a NITIm radical, closely related to NITBzImH radical. Finally, we started to explore the changes induced by switching manganese(II) to lanthanide(III)
Yang, Sen. "Characterization of low voltage cathodo-luminescent phosphors for field emission displays." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/30859.
Full textDai, Xuemin, and 戴學敏. "Experimental and theoretical studies of defects related emissions in ZnO crystals." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B4163388X.
Full textDai, Xuemin. "Experimental and theoretical studies of defects related emissions in ZnO crystals." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B4163388X.
Full textPartl, Michal. "Total fluorenscence spectra of resorufin and anthracene : applications of singular-value decomposition in total luminescence spectroscopy /." Zürich, 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10785.
Full textMühlenberend, Svenja [Verfasser]. "Metals and organic adsorbates on GaAs(110) : a scanning tunneling microscopy, spectroscopy and luminescence study / Svenja Mühlenberend." Kiel : Universitätsbibliothek Kiel, 2016. http://d-nb.info/1096220903/34.
Full textyu, shenjiang. "NEW DEVELOPMENTS ON HIGH-RESOLUTION LUMINESCENCE SPECTROSCOPY AND THEIR APPLICATION TO THE DIRECT ANALYSIS OF ORGANIC POLLUTANTS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4075.
Full textPh.D.
Department of Chemistry
Sciences
Chemistry: Ph.D.
Schneider, Julia. "Characterisation of Single and Multibubble Cavitation Through Analysis of Molecular, Atomic and Ionic Line Emissions." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20011.
Full textThe importance of acoustic cavitation, i.e., the formation, growth and collapse of gaseous cavities in liquid exposed to ultrasound, in sonochemistry is based on the generation of extreme conditions upon bubble collapse. Temperatures and pressures inside the collapsing bubble are approximated to reach 104 K and 1000 atm, respectively [suslick-1999]. Under such conditions chemical bonds of the solvent vapour or volatile solutes present in the bubble core are easily cleaved, which in the case of aqueous systems, leads to the formation of chemically reactive OH and H radicals. These primary radicals either recombine leading to chemiluminescence, or diffuse into solution, where they are liable to react with other species. Of particular importance in this work is the light emission that accompanies cavitation, termed sonoluminescence (SL). This emission is a broad continuum ranging from 200nm to 900 nm, resembling the emission of a blackbody, which can be superimposed with atomic or molecular emission lines comparable to bremsstrahlung. It is necessary to distinguish two forms of SL, single-bubble (SBSL) and multibubble (MBSL). In general, MBSL spectra differ from SBSL spectra in that they contain emission lines, e.g., from alkali atoms or hydroxyl radicals [matula-1995]. Consequently, it was, until recently considered that the mechanisms of light emission, and the nature of the bubble interior upon collapse were fundamentally different for the single and multibubble systems. Considering that MBSL is a cloud of single bubbles a bridging theory is desired.With this background the objective of the present work was to conduct a comparative spectroscopic analysis of SBSL, driven at 27 kHz, and MBSL generated from low and high ultrasonic frequencies (20, 203 and 607 kHz) of aqueous electrolyte solutions. Therefore a single bubble sonoreactor was developed, where the temperature, gas content and type, as well as the acoustic pressure could be controlled. The electrolytes of choice were: sodium chloride and chlorides of the luminescent lanthanide ions, Ce3+, Tb3+, Eu3+ and Gd3+, which can be excited by UV light absorption and collisions with energetic particles [kulmala-1995]. In the first part of this work the conditions upon bubble collapse were approximated by fitting the broad-band continuum of SBSL spectra of water with 70 mbar of argon and a 0.5 M NaCl solution with 70 mbar of argon using Planck's law of blackbody radiation. The obtained blackbody temperatures are in the range of 104 K, which is in good agreement with previous studies, but with the discrepancy of being independent of the presence of NaCl and the acoustic pressure, whereas the SL intensity increased by a factor of more than 10 upon increased acoustic pressure. The different trends followed by SL intensity and blackbody temperatures question the blackbody model. Another observation questioning the blackbody model is the appearance of atomic and molecular emission lines in MBSL and as recently observed also in SBSL [liang-2007, young-2001]. The present work proofed that the key factors for line emission in SBSL are small amounts of argon and low acoustic pressure. Moreover, the work revealed that the shape of the OH• radical emission is very similar to that in MBSL spectra, indicating the strong similarity of intrabubble conditions in MBSL and SBSL under certain experimental conditions [schneider-2011]. An increase of the acoustic pressure caused the continuum to overlap the lines until they become indistinguishable giving the usually in SBSL observed featureless continuum. This advance is a big step toward bridging the gap between SBSL and MBSL. Furthermore this study reveals that the concentration of the sodium ion at the interface of a single bubble can be enriched with a surface active counterion and the concentration is crucial for the observation of the sodium line in SBSL, suggesting that excitation of sodium either takes place at the interface of the
柯俊達 and Chun-tat Or. "Optical characterization of defects in GaN." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226607.
Full textMilori, Debora Marcondes Bastos Pereira. "Caracterização do LiNbO3:Er+3 como meio ativo para lasers de estado sólido através dos espectros de absorção/emissão polarizada e medida dos tempos de vida de luminescência." Universidade de São Paulo, 1989. http://www.teses.usp.br/teses/disponiveis/54/54131/tde-19052009-104534/.
Full textThis work consists in the optical characterization of LiNbO3:Er3+ single crystals, aiming to verify the possibility of this system being an active media for laser. The absorption and emission results were satisfactory, being compatible enough with the theoretical model adopted. The luminescence lifetime of the 4S3/2 - 4I15/2 e 4F9/2 - 4I15/2 transitions was measured at the ambient and liquid nitrogen temperature, showing that they are possible candidates for laser transitions. The behavior of the undesirable OH- and Fe2+ impurities was also studied through thermal treatment. The control of these concentrations was done using the EPR and optical absorption techniques and the results showed it is possible to eliminate such impurities in a totally controlled way.