Дисертації з теми "Photon luminescence"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Photon luminescence".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Ogurtsov, Alexander, Olga Bliznjuk, and Nataliia Masalitina. "Crystal size effect in polaritonic luminescence from atomic cryocrystals." Thesis, Hyogo University, 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/44703.
Повний текст джерелаShastri, Vasant. "Single-photon-counting technique for luminescence spectra and decay measurements." Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183060409.
Повний текст джерелаMcFee, Christopher James. "The use of an imaging photon detector for luminescence dating." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296940.
Повний текст джерелаBalasubramanian, Haribhaskar. "Two photon luminescence from quantum dots using broad and narrowband ultrafast laser pulses." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2020.
Повний текст джерелаGhenuche, Petru Virgil. "Probing the near-field optical response of plasmon nanostructures with two-photon luminescence microscopy." Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/22737.
Повний текст джерелаThis thesis describes the design, fabrication and the optical characterization of plasmon-resonant systems able to confine and enhance light fields down to the sub-wavelength scale. Extensive 3D numerical modeling was first used to design different geometries of coupled plasmonic nanostructures through the calculation of their far-field and near-field optical response. On the basis of simulations, the nanostructures were fabricated by e-beam lithography and thin film deposition. Special efforts were devoted to increasing the resolution and optimizing the reproducibility of critical parameters such as particle shape and interparticle gaps. Finally, far-field spectroscopy combined with two-photon induced luminescence (TPL) spectroscopy was used to probe the local optical response of the optimized architectures. We focused our attention on different families of structures: metal dimers, bar antennas, finite chains of nanoparticles and star-like particle arrangements. Particle dimers feature strong field enhancements in their sub-wavelength gap due to near-field coupling of their dipolar localized plasmon resonances. Based on the same physics, gap antennas, formed by two adjacent gold bars supporting multipolar resonances can efficiently couple to propagating light and concentrate it into tiny volumes. While finite particle chains were previously shown by other authors to be good candidates to guide light through subwavelength cross-sections, we show here that they can also be used as efficient nanolenses able to concentrate light at their extremity. Finally, the near-field distribution in star-like arrangements of gold nanoparticles exhibits a strong dependence with the incident field polarization which can be exploited for dynamical optical addressing of nano-objects. We have compared the far field spectroscopy of large ensembles of dimers and finite chains to TPL spectroscopy. Our main result is to show that TPL is preferentially sensitive to local fields and that it enables the assessment of spectroscopic features which cannot be resolved otherwise. In order to overcome the limitations of measurements on large ensembles a considerable effort was dedicated to mounting and optimizing an optical set-up enabling TPL measurement of single structures. Using the developed TPL micro-spectroscopy, spatially resolved spectral mode mapping on single resonant gap-antennas was achieved. As predicted by calculations, we were able to directly visualize at resonance the strongly enhanced TPL signal within the gap. Our results show how TPL scans can be directly compared with the convoluted distribution of the fourth power of the calculated local mode field. By monitoring the evolution with the incident wavelength of the TPL signal within the gap and at the antenna extremities we got further insight in the physical mechanism behind the buildup of the antenna’s resonance. Finally, TPL microscopy was used to probe the local fields under different orientations of the incident linear polarization near star-like arrangement of gold disks. It is shown that, unlike the scattering spectrum, the TPL distribution over the structure is found to depend drastically on the incident polarization state. Our study brings a significant contribution to the field of Plasmon optics by proposing novel geometries able to efficiently confine optical fields down to the nanometric scale, but also by providing deep insight into the use of TPL microspectroscopy to probe their local optical response. Our findings are foreseen to be important in applications such as enhanced spectroscopy, bio-sensing and enhanced light-matter interaction, where one needs to assess the actual field experienced by small amounts of matter.
Bourrellier, Romain. "Luminescence at Defects in h-BN : Excitons at Stacking Faults and Single Photon Emitters." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112285/document.
Повний текст джерелаWithin the latest years number of layered materials at reduced dimensions have demonstrated remarkable optical properties. However most studies focused on perfect system and the role of defects as optical active centers remain still largely unexplored. Hexagonal boron nitride (h-BN) is one of the most promising candidates for light emitting devices in the far UV region, presenting a single strong excitonic emission at 5.8 eV. However, a single line appears only in extremely pure mono-crystals that can hardly be obtained only though complex synthesis processes. Common h-BN samples present more complex emission spectra that have been generally attributed to the presence of structural defects. Despite a large number of experimental studies up to now it was not possible to attribute specific emission features to well identify defective structures. Here we address this fundamental question by adopting a theoretical and experimental approach combining few nanometer resolved cathodoluminescence techniques with high resolution transmission electron microscopy images and state of the art quantum mechanical simulations. Very recently, the Orsay team has developed a cathodoluminescence detection system integrated within a scanning transmission electron microscope. This unique experimental set up is now able to provide full emission spectra with a resolution as low as few tens of meV associated with an electron probe size of one nanometer. A cathodoluminescence hyper-spectral image can thus be recorded in parallel with an HAADF image. Nanometric resolved cathodoluminescence on few-layer chemically exfoliated h-BN crystals have shown that emission spectra are strongly inhomogeneous within individual flakes. Emission peaks close to the free exciton appear in extended regions. Complementary investigations through high resolution transmission electron microscopy allow to associate these emission lines with extended crystal deformation such as stacking faults and folds of the planes. By means of ab-initio calculations in the framework of Many Body Perturbation Theory (GW) approximation and Bethe-Salpeter equation) we provide an in-depth description of the electronic structure and spectroscopic response of bulk hexagonal boron nitride in the presence of extended morphological modifications. In particular we show that, in a good agreement with the experimental results, additional excitons are associated to local symmetry changes occurring at crystal stacking faults. These result will then be extended to faceted multiwalled BN nanotubes, they display additional emission at the same energy as characterized within the flakes
Kang, Ji-Hwan. "Energy transfer enhancement of photon upconversion systems for solar energy harvesting." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45846.
Повний текст джерелаVezzoli, S. "EXPERIMENTAL STUDY OF NANOCRYSTALS AS SINGLE PHOTON SOURCES." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/222688.
Повний текст джерелаDehlinger, Mael. "XAS-XEOL and XRF spectroscopies using near field microscope probes for high-resolution photon collection." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4048/document.
Повний текст джерелаScanning Probe Microscopes allow to obtain sample topography up to atomic resolution. X-ray spectroscopies allow elemental and structural analysis of a sample with accuracy better than 1 Å. The lateral resolution is limited by the primary beam diameter, currently a few µm². We have chosen to couple this two technics. Local sample visible luminescence is collected through a low aperture sharp optical fibre, probe of a shear force microscope. This technique was used to characterize microstructured semiconducting samples to achieve simultaneously the surface topography and luminescence mapping. The results were obtained using either synchrotron radiation or a laboratory microsource equipped with a polycapillary lens. To extend this concept to a wider variety of materials, local XRF collection by an EDX detector equipped with a cylindrical X-ray capillary was tested. A cobalt sample irradiated with the microsource was used for technique evaluation. The signal magnitude dependence with the capillary diameter was measured. Modelling and numerical calculations were developed to estimate the signal magnitude that could be detected using a 1 µm diameter capillary. The optimal system geometry was determined. Scanning Probe Microscopy combined to XRF analysis could thereby lead to simultaneous acquisition of sample topography and chemical mapping. The expected lateral resolution using synchrotron radiation is 100 nm while sub 1 µm resolution is realistic with a laboratory source. This technique would allow to point a peculiar micro- or nano-object on the surface and to perform its chemical analysis
Durantel, Florent. "Mesure de luminescence induite par faisceaux d'ions lourds rapides résolue à l'echelle picoseconde." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC261/document.
Повний текст джерелаWe developed an instrument for measuring the luminescence induced by a heavy ion beam (nucleons 12) and energy in the range of MeV / nucleon. Based on a single photon counting method obtained by coincidences, the device can provide in the same run a 16-channel energy spectrum in the UV-visible- IR region (185-920 nm) and a time-resolved response in the range of ns up to µs for each channel. Temperature measurements can be performed from room temperature down to 30K.This work places particular emphasis on data extraction methods: Once the need to deconvolve the signals demonstrated the evaluation of different instrument profiles (simulated and reconstructed from measurements) leads to a systematic temporal characterization of each component of the device. Then, these instrumental profiles are used in two deconvolution methods: least squares first followed by maximum entropy method.Two typical materials are tested: the Strontium Titanate for the study of the dynamics of the electronic excitation, and a commercial scintillator, the BC400, for the study of the aging and the decrease of performances with fluence. In both cases, we have been able to highlight the presence of an ultrafast component of subnanosecond time constant
Andrasik, Stephen James. "Singlet Oxygen Generation Using New Fluorene-Based Photosensitizers Under One- and Two-Photon Excitation." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2210.
Повний текст джерелаPh.D.
Department of Chemistry
Sciences
Chemistry PhD
Bui, Ngoc Anh Thy. "Luminescence de complexes de lanthanide par effet d'antenne à deux photons : vers l'imagerie fonctionnelle." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEN021.
Повний текст джерелаLanthanide ions demonstrate peculiar photophysical properties that has attracted a substantial attention in the development of luminescent bioprobes. Indeed, the advantages stemming from their sharp and characteristic emissions, as well as their long luminescence lifetimes, enable various imaging applications. However, the weak molar extinction coefficient of these elements results in a preferential excitation through an antenna, which transfers its energy to the metal.On the other hand, biphotonic absorption showed numerous advantages, since excitation of a molecule can be achieved at a wavelength twice as high as using one-photon excitation. This wavelength may therefore reach the optical transparency window (650 - 1100 nm).The work carried out during this PhD thesis aims at combining the advantages of lanthanides with those of biphotonic excitation. The synthesized complexes are based on a triazacyclononane platform substituted with two-photon antennae. Their one-photon spectroscopic properties have been studied, and enabled to perform two-photon multiplexed cellular imaging, using Eu3+ and Tb3+. Biphotonic probes with an optimized brightness have been obtained for Sm3+, Tb3+ and Dy3+, and applied to cell imaging. The thorough study of one of the terbium(III) complexes has moreover displayed evidence of a sensitivity towards viscosity. Analyzing the spectroscopic properties of this probe has therefore allowed to rationalize its photophysical behavior, paving the way for original functional imaging applications. Lastly, a rapid internalization of cationic lanthanide complexes with a cyclen or cyclam framework by living cells has been proved. Thus, the study of these new structures presents new perspectives for the development of lanthanide bioprobes
Dehlinger, Maël. "XAS-XEOL and XRF spectroscopies using Near-Field Microscope probes for high-resolution photon collection." Phd thesis, Aix-Marseille Université, 2013. http://tel.archives-ouvertes.fr/tel-00880623.
Повний текст джерелаKhaoua, Ibtissame. "Approche quantitative de la bio-chimiluminescence ultrafaible : oxydation et métabolisme Detectivity Optimization to Detect of Ultraweak Light Fluxes with an EM-CCD as Binary Photon Counter Array 3D To 2D Stochastic Concentration of Highly Diluted Light Reveals Ultraweak Chemi- and Bio-Luminescence." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASL005.
Повний текст джерелаIt has been known for decades that ultra-weak visible and UV light is emitted by most living tissues due to their oxidative metabolism, as well as by some simple reactions in aqueous medium. However, these phenomena are not well known due to the extreme weakness of the light emission, hence called "ultra-weak" luminescence. In this thesis, we propose an original experimental setup to make extremely sensitive measurements of the luminescence produced by a sample per unit volume.We reached a detection limit of ≈ 1 photon s−1cm−3 which corresponds to ≈ 2.10−21 M.s−1. To obtain this result, we combined: 1) the darkest environment possible, 2) an integrating sphere with extreme reflectivity which brings the maximum amount of photons onto the detector, 3) an amplified camera in binary mode (visible : 400 − 900) and a statistical model which optimizes detectivity, and 4) a semi-automatic procedure to operate in darkness. This setup enables the following: 1) the detection limit is ≈ 9.2 photons s−1cm−2 on the camera, which accounts for ≈ 1% of its dark current, 2) ≈ 12% of the photons emitted isotropically by the sample are detected, 3) measurement of light intensity variations is optimized by maximizing the detectivity, rather than by maximiz- ing the signal-to-noise ratio.Then, we studied the luminescence produced by the disproportionation of H2O2 in water. This reaction catalysed in cells by peroxidases, is important for the metabolism, and is critical to the understanding chemiluminescence in general and and luminol-based applications in particular. We quantified for the first time without a catalyst, the dose-dependent luminescence of the disproportionation reaction in pure water, with ≈ 15photonss−1cm−3 for [H2O2 = 90] mM. Using a well-known biological model, Saccharomyces cerevisiae (baker’s yeast), cultured in liquid, we showed a peak in the luminescence associated with the beginning of the exponential growth phase, followed by a sustained decrease over 10 hours. This light production represents approximately 10−5 photons per second per cell.We hope our work leads to better quantitative study of the ultra-weak luminescence in chemistry and biology. This quantification is necessary for understanding the fundamental underlying mechanisms behind luminescence and to develop chemical and biomedical applications
Baffou, Guillaume. "Luminescence induite par microscopie à effet tunnel et étude des propriétés électroniques, chimiques et optiques de la surface de carbure de silicium 6H-SiC(0001)3x3." Phd thesis, Université Paris Sud - Paris XI, 2007. http://tel.archives-ouvertes.fr/tel-00190955.
Повний текст джерелаLa thématique dans laquelle s'inscrit cette thèse est la luminescence induite par STM sur substrat semiconducteur à large bande interdite. Les travaux ont porté sur la reconstruction de surface SiC(0001)3x3 du carbure de silicium (SiC) et s'articulent autour de trois parties.
La première partie est consacrée à l'étude de la luminescence de la jonction tunnel métal/vide/SiC(0001)3x3. Cette étude, en parallèle à des mesures de spectroscopie tunnel, a mis en évidence les mécanismes et propriétés de transport électronique le long des états de surface du SiC.
Une deuxième partie est dédiée à l'adsorption de molécules organiques sur la surface SiC(0001)3x3. La fonctionnalisation organique du SiC est une étape indispensable pour l'étude de molécules individuelles mais aussi pour la conception de matériaux hybrides organique/inorganique. La résolution submoléculaire du STM associée à des calculs ab initio en collaboration ont dégagé un modèle de chimisorption détaillé de la phthalocyanine hydrogénée.
La dernière partie décrit des simulations numériques, basées sur le formalisme des tenseurs de Green, de la lumière émise par la jonction tunnel. Ces travaux ont permis de modéliser d'une part l'influence de la forme de la pointe du STM sur le spectre de la lumière émise, d'autre part l'inhibition de la fluorescence de molécules individuelles excitées par STM.
LIBRANTZ, ANDRE F. H. "Estudo comparativo da emissoes do Nd(3+) nas configuracoes 4fsup(2)5d e 4fsup(3) induzidas pela excitacao multifotonica em cristais de YLF, GLF, LLF." reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10830.
Повний текст джерелаMade available in DSpace on 2014-10-09T14:07:22Z (GMT). No. of bitstreams: 1 07114.pdf: 5950239 bytes, checksum: a45c843d71dddc5fe0b565d5be615211 (MD5)
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Butler, Sween J. "Nonlinear Light Generation from Optical Cavities and Antennae." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984232/.
Повний текст джерелаSIRONI, LAURA. "Nanoparticles for in-vitro and in-vivo biosensing and imaging." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/19278.
Повний текст джерелаKhan, Amena Lutfa Tabenda. "Analysis of electron-phonon coupling from the luminescence of conjugated polymers." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615099.
Повний текст джерелаSun, Yuxuan. "Setup for Micro Photo- and Electro-Luminescence of Optoelectronic Device Structures." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175708.
Повний текст джерелаWilkins, Matthew. "Multi-Junction Solar Cells and Photovoltaic Power Converters: High-Efficiency Designs and Effects of Luminescent Coupling." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36181.
Повний текст джерелаSavel, Paul. "Absorption à deux photons et photochromisme de complexes de ruthénium : application au stockage optique de données." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S090/document.
Повний текст джерелаThe development of new technologies , computer and internet in recent decades has been accompanied by an increasing demand for media storage information. In particular , the optical data storage .Conventional media ( CD-ROM , Blu-ray ... ) based on a storage disk surface, have now reached their limits. A new technology being developed , based on a data storage in three dimensions, is a promising alternative to replace conventional materials. Materials must include entities for photochromic properties (molecular switch) and multi- photon absorption demonstrated. In this thesis , we considered the synthesis of functional molecules which present these two characteristics. As a first step , we are interested in the synthesis and comparative study of homo and heteroleptic ruthenium complex having a certain potential for two-photon absorption . We have shown that these systems were very active and they allowed to host a photochromic entity lossless bi- photonic properties. We then studied the properties of originals photochromic ruthenium tris- bipyridine containing an azobenzene motif. The metal complexing profoundly changes the photochromism of azobenzene with significantly different from those ligands kinetics . Finally, we studied the properties of hybrid complexes of ligands for the two-photon absorption and others to photochromism , these compounds are active in both areas. We finally discuss the potential of the optical behavior of compounds of these complex films. We conducted preliminary tests of the SHG signal modulation on these films. We want to maximize all components of the process to determine the potential of these compounds in optical data storage
Suleimanov, Iurii. "Nano-objets et nano-composites à transition de spin basés sur des complexes du fer(II) avec des ligands 1,2,4-triazoles." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30017.
Повний текст джерелаThe thesis is devoted to the preparation of new nanoobjects and nanocomposites of spin crossover complexes [Fe(Htrz)2(trz)](BF4) and [Fe(NH2-trz)3](NO3)2 (where Htrz - 1,2,4-triazole, trz - 1,2,4-trazolato, NH2-trz - 4-amino-1,2,4-triazole) and investigation their properties. Nanoobjects of mixed-ligand complexes with different ratio of 4-amino-1,2,4-triazole to 1,2,4-triazole were synthesized in reverse emulsions. It was shown that the increasing of the of 4-amino-1,2,4-triazole quantity leads to the increasing of nanoparticles anisotropy while spin crossover temperatures decrease. Double-step spin transition was observed at 20% mol of 4-amino-1,2,4-triazole, while at concentrations over 50% mol. spin crossover properties of [Fe(Htrz)2(trz)](BF4) completely disappear. Investigations of their morpholgy, size and spin transition characteristics as well as investigations of mechanisms of the fluorescent properties change under the spin switching process are shown. We consider obtaining nanoobjects of mixed-ligand complexes of iron (II) based on 1,2,4-triazole and 4-amino-1,2,4-triazole. The ligands ratio influences the morphology, size and characteristics of the spin transition of nanoobjects obtained. New modification of the complex [Fe(NH2-trz)3](NO3)2 in the form of nanoobjects was obtained using ligand excess. High transition temperature of this form was evidenced by various methods of analysis. This form was found to be isostructural with a resolved structure of [Fe(NH2-trz)3](NO3)2 · 2H2O. Series of nanocomposites with plasmonic and luminescent properties were prepares. For the core-shell composite with gold nanoparticles higher efficiency of the spin state switching due to the photothermal effect was demonstrated in comparison to the control sample. Fluorescent spin crossover composites with quantum dots, organic luminophors and terbium complexes were described. For all these composites the luminescence intensity variation as a function of temperature have been found. The mechanisms responsable of the luminescence intensity variation at two spin state are discussed. These mechanisms include resonant energy transfer, mechanical strain and photon reabsorption. High photostability fort he terbium - spin crossover composite is demonstrated comparing to previously obtained similar spin crossover luminescetnt composites. An example of a practical application of obtained composites for manufacturing fluorescent thermosensitive paper is shown
Bellec, Matthieu. "Nanostructuration par laser femtoseconde dans un verre photo-luminescent." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2009. http://tel.archives-ouvertes.fr/tel-00459311.
Повний текст джерелаCantelli, Andrea <1988>. "Luminescent and Photo-Responsive Gold Nanoparticles for Bio-Applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7616/1/cantelli_andrea_tesi.pdf.
Повний текст джерелаCantelli, Andrea <1988>. "Luminescent and Photo-Responsive Gold Nanoparticles for Bio-Applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7616/.
Повний текст джерелаGloukhov, Roman. "Cinétique des excitations électroniques dans les cristaux inorganiques isolants." Lyon 1, 1999. http://www.theses.fr/1999LYO10213.
Повний текст джерелаBouazaoui, Mohamed. "Spectroscopie laser à deux photons d'ions de terres rares en milieu cristallin." Lyon 1, 1990. http://www.theses.fr/1990LYO10242.
Повний текст джерелаZheng, Zheng. "Development of Far-Red / Near-Infrared Luminescent Chromophores and Nanoparticles for in vivo Biphotonic Applications." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEN024/document.
Повний текст джерелаThe development of fluorophores with efficient two-photon absorption (TPA) and emission properties in the far red/NIR is important, especially for in depth in-vivo optical imaging as this wavelength range corresponds to the optical transparency window of tissues. This thesis investigates the potential of new red emitting fluorophores containing a fluorene ring for in-vivo two-photon microscopy focusing on vascular imaging on one hand and on oxygen pressure measurement on the other hand.A new series of asymmetrical fluorene-based chromophores were designed and synthesized. Their structure-property relationships were systematically investigated. It was found that most of chromophores exhibit aggregation-induced emission behaviors in the NIR region. In addition, a micelle/silica coprotection strategy was proposed to prepare nanoparticles with a less polar interior, which can be used to conserve optical properties of dipole chromophores in aqueous solution. The two-photon excited fluorescence (TPEF) measurements indicate that they all display obvious TPA activities in organic solvent and aqueous suspension. Both the NIR-emissive aggregates and nanoparticles have been successfully used for TPEF imaging of blood vessels inside mouse ear skin. The silica nanoparticles show outstanding staining of the vascular system making them perfect blood pool markers.On a second part, four new fluorene-based two-photon absorbing chromophores have been synthesized and their one- and two-photon photophysical properties were investigated. The optimum chromophore was successfully attached covalently to an oxygen responsive phosphorescent Pd-porphyrin complex by click chemistry. Two new compounds contain four or eight TPA chromophores donor connected to the phosphorescent core. The result demonstrate that the incorporation of a suitable TPA chromophore can effectively enhance the TPA of the system, allowing efficient sensitivity towards oxygen
Jacquet, Margot. "Complexes de ruthénium (II) intégrant l'unité photochromique Diméthyldihydropyrène : Vers de nouvelles photo-réactivités." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAV088/document.
Повний текст джерелаThe work of this thesis is devoted to the development of original photo-switchable ruthenium(II) complexes incorporating the photochromic Dimethyldihydropyrene (DHP) / Cyclophanediene (CPD), for future optoelectronic molecular devices.In order to realize complex systems capable of reproducing the functions of a logic circuit, an interesting strategy is based on the association of photo-switchable molecules and metal complexes. However, this strategy is confronted with some major obstacles, generally associated with the loss of the switching properties of organic photochromes. In response to previous results confirming this trend, two new families of DHP-based terpyridine ruthenium(II) complexes have been synthesized. Since the presence of pyridinium function significantly improves the isomerization properties of the DHP core, the metal centers were connected either via a pyridinium benzyl linkage (Ru-Lpy+tpy) or via an aryl pyridinium linkage (Ru-LZincke). Although operating at lower energy, Ru-LZincke complex exhibits lessened performance, whereas Ru-Lpy+tpy complexes exhibit a notable preservation of their switching properties. Following the discovery of an original photo-reactivity favored by the presence of metal center, an analogue family based on ruthenium (II) bipyridine complexes (Ru-Lpy+bpy) was studied. Even if the mechanisms are not completely rationalized, Ru-Lpy+bpy complexes have proved to be remarkable candidates for the realization of quantitatively reversible photo-switches in the visible domain
Bizarri, Grégory. "Étude des mécanismes de dégradation du luminophore Ba Mg Al10 O17 : Eu 2+ : influence des traitements thermiques et de l'excitation par des photos de haute énergie (ultra violet du vide)." Lyon 1, 2003. http://www.theses.fr/2003LYO10241.
Повний текст джерелаDubrovin, V. D., A. I. Ignatiev, N. V. Nikonorov, and A. I. Sidorov. "Influence of Halides on the Luminescence of Silver Molecular Clusters in Photo-Thermo-Refractive Glasses." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35248.
Повний текст джерелаGu, Minming. "Cartographie d'émission de photons en microscopie par effet tunnel : application à la luminescence locale du silicium poreux." Aix-Marseille 2, 1993. http://www.theses.fr/1993AIX22047.
Повний текст джерелаLongaresi, Rafael Henriques. "Estudo da anisotropia de emissão luminescente de filmes poliméricos ordenados." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-21012013-145713/.
Повний текст джерелаPhotophysics processes in conjugated polymer are closely related with the molecular segments conformation. Conjugated polymers thin films has shown an intrinsic anisotropy due to the molecular segments conformation making this materials attractive in photophysics studies by its polarized emission when stimulated by light or biased. In this work, we correlated the photoluminescence spectra of a derivative PFO polymer thin films, namely poly(9,9-dioctylfluorenyl-2,7-diyl) end capped with dimethylphenyl, with the molecular anisotropy. Mechanically stretched thin films undergo a molecular rearrangement process of inducing emission of light predominantly polarized in the direction of stretch. The stretching also causes an increase in the effective conjugation length of the molecular segments influencing the electron-phonon coupling. By ellipsometry technique, it was possible to determine the polarization states of light (by the Stokes parameters) and temperature dependent stationary photoluminescence measurements enabled us to get the electron-phonon coupling from the Franck-Condon principle. Measurements of photoluminescence excitation (PLE) have determined that the PL spectrum consists of spectral overlap of the two emitting species: the isolated and aggregated species. At low temperatures the PL emission peaks has presented well-defined as a result of PFO molecular dynamics favoring the emission of the isolated species. For temperatures above the transition beta temperature (270 K), the emission of aggregated species is favored, causing a possible energy transfer isolated to aggregate species. The stretching induces an increase in the conjugation length, reflected in the decreasing Huang-Rhys factor \'S IND. ISO\' POT. LO\'|140 K = 0,40 to non-stretched samples and \'S IND. ISO\' POT. 2Lo\'| 140 K = 0,19 for the sample with the highest draw ratio, making the spectrum more resolved. Unstretched samples under polarized excitation parallel to the stretching showed total polarized emission P = 3,4% linearly parallel to the stretching and fluorescence anisotropy of r = 0,025 and the L = 2Lo samples showed P = 46,1% of polarized emission along the direction of stretching and fluorescence anisotropy r = 0,27. The polarized emission was found to be independent of temperature. The fluorescence anisotropy was found to be strongly dependent of stretching rates and for temperatures above 340 K, a characteristic onset temperature of phase transition of the PFO.
Molinaro, Céline. "Etude par luminescence à deux photons des propriétés plasmoniques de nano-objets uniques métalliques ou hybrides." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS321/document.
Повний текст джерелаMy PhD work has been dealing with the two-photon luminescence (TPL) study of single gold nanostructures, possibly coupled in order to determine their nano-antenna optical properties. Key parameters to explain the origin of the TPL were provided from the two-photon luminescence study of single small 10 nm x 40 nm colloidal gold nanorods (GNR) which highlight the transverse plasmon influence. This origin was confirmed by the results obtained after the characterization of nanobipyramid exhibiting plasmonic properties closed to nanorods. A deeper insight in this model was further developed after investigating the properties of gold nanorods having closed aspect ratio and plasmonic resonances but increasing volume. Experimental data were correlated with BEM (Boundary Elements Method) simulations. It was shown that the TPL signal was coming from the bulk atoms. Photodegradations problems have moreover been observed and analyzed. Above the analysis of gold nanorods, the lightning rod effect of nanobipyramid was also investigated. Finally very high TPL intensity spots were recorded in semi-continuous gold films close to percolation. A second part of my study was related to the fabrication and the characterization of the optical properties of hybrid nano-emitters. They were fabricated by coupling a nano-antenna with fluorophores. Two different techniques were tested: the so-called layer-by-layer method and localized nanophotopolymerization. In both cases, together with the difficulty to accurately control both methods, retrieving the molecules signal from the huge TPL signal of the gold nanostructures was shown to be rather difficult
Guénaud, Charles. "Etudes des propriétés optiques de semiconducteurs à grand gap : puits ZnSe/ZnCdSe et couches minces de GaN." Paris 6, 1999. http://www.theses.fr/1999PA066224.
Повний текст джерелаGrund, Olof. "Modification of a transient EPR and photoluminescence detection setup." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-328896.
Повний текст джерелаMcGarvey, D. J. "Photo-processes of tetrapyrrolic sensitisers studied laser flash photolysis, pulse radiolysis and singlet oxygen luminescence techniques." Thesis, Open University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233555.
Повний текст джерелаGutmann, Johannes [Verfasser], and Hans [Akademischer Betreuer] Zappe. "Photonic luminescent solar concentrators : : how photonic crystals affect the emission and guiding of light = Photonische Fluoreszenzkonzentratoren." Freiburg : Universität, 2014. http://d-nb.info/1123484880/34.
Повний текст джерелаDelcey, Nicolas. "Tectonique moléculaire : réseaux moléculaires à propriétés optiques assemblées par des liaisons hydrogène chargées." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00832512.
Повний текст джерелаBanaei, Esmaeil. "Polymer Optical Fibers for Luminescent Solar Concentration." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5898.
Повний текст джерелаPh.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
Pfau, Charlotte [Verfasser], S. [Akademischer Betreuer] Schweizer, R. [Akademischer Betreuer] Wehrspohn, and U. [Akademischer Betreuer] Rogulis. "Low phonon energy glass ceramics for efficient rare-earth luminescence / Charlotte Pfau. Betreuer: S. Schweizer ; R. Wehrspohn ; U. Rogulis." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1076503195/34.
Повний текст джерелаKatayama, Yumiko. "Optical and photo-electric studies on quantum cutting and persistent luminescent phosphors doped with rare-earth and transition-metal ions." Kyoto University, 2014. http://hdl.handle.net/2433/188818.
Повний текст джерела0048
新制・課程博士
博士(人間・環境学)
甲第18380号
人博第693号
新制||人||166(附属図書館)
25||人博||693(吉田南総合図書館)
31238
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 田部 勢津久, 教授 加藤 立久, 教授 杉山 雅人, 教授 森本 芳則, 教授 山本 行男
学位規則第4条第1項該当
Banda, Gnama Mbimbiangoye Mallys Elliazar. "Mesure et modélisation du comportement de matériaux diélectriques irradiés par faisceau d'électrons." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30208/document.
Повний текст джерелаIn their common uses as electrical insulators, organic solid materials are constitutive of electric power transmission cables, power control and conversion circuits as well as (micro) electronic components or embedded systems (thermal coating of satellites, batteries of accumulators, etc.). Under various constraints of use (electric field, radiation, temperature, humidity ...) they can accumulate charges in their bulk which could affect the reliability of the systems in which they are employed. One of the commonly used means to study the electrical behavior of these charges is to measure the spatiotemporal distribution of charges by subjecting the dielectrics to a continuous potential difference between two electrodes. However, this method does not always allow clearly distinguishing the contribution of charges due to generation on the one hand and the one due to transport phenomena on the other hand. This study proposes an alternative approach, consisting in generating charges (electrons) within the electrical insulation using an electron-beam under vacuum. The charges are hence deposited at a known position and in a controlled quantity. Other physical processes related to the implantation of electrons must then be taken into account in order to predict and model the behavior of these irradiated materials. Low-density polyethylene (LDPE) films, prepared by thermal molding, were irradiated by a 80 keV electron-beam with a current flux of 1 nA/cm2. Space charge measurements using the Pulsed Electro-Acoustic (PEA) method, performed first in-situ and then ex-situ under DC electrical polarization, confirm an effective localization of charges within the material. The results under electrical polarization after irradiation show an important amount of positive charges in the irradiated zone of the dielectric. The electrical characterizations of irradiated LDPE films show a completely different behavior compared to the same non-irradiated material, suggesting a modification of the chemical structure of the material. Physico-chemical measurements (infrared spectroscopy, Photoluminescence and Differential Scanning Calorimetry-DSC) on these irradiated PEbd films do not show a significant degradation of the chemical structure of the dielectric which would explain the observed electrical behavior under post-irradiation polarization. Additional measurements show the reversible behavior of the irradiated then polarized PEbd, which would be only related to the presence of the charges generated by the beam. The experimental data of this study have simultaneously fed a numerical model of charge transport, developed to take into account the irradiation constraints. This model allows reproducing the in-situ results of charge implantation by the electron beam as well as the majority of the electrical processes observed on irradiated and polarized LDPE. It confirms the impact of the electron-beam deposited charge on the behavior under polarization and allows concluding on the origin of the positive charges observed after irradiation, which would be due to injection at the electrodes as well as to the creation of electron-hole pairs by the electron-beam during irradiation
La, Rosa Marcello. "Development of luminescent semiconductor nanocrystals (Quantum Dots) for photoinduced applications." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0591/document.
Повний текст джерелаThis thesis focuses on the development of luminescent semiconductor nanocrystals quantum dots (QDs) for photoinduced applications. QDs are promising nanomaterials with size-dependent optical properties and are attractive for applications in several fields.However, QDs are commonly hydrophobic and many interesting applications require their compatibility with water or at least with a polar environment, meaning a post-synthetic treatment is required to confer a different solubility.During these studies, a new method for transferring QDs from an apolar solvent to another one polar has been successfully developed, by exploiting lipoic acid, as a versatile surface capping agent. Moreover, lipoic acid is a chiral molecule so a possible induced dichroism effect has been also investigated, as well as its dependence on the size of nanocrystals.A major aim of this research was the development of QDs exhibiting reversible electronic energy transfer (REET). Such a process is a bidirectional energy transfer between the photoexcited QDs and suitable chromophoric units attached on their surface, whose most important consequence is the elongation of the luminescence lifetime of the QD. Strong experimental evidence for REET and accompanying modifications of the photophysical properties has been obtained. Such a process to our knowledge has never been observed in QD-based systems.Finally, a novel protocol for depositing charged QDs on a locally polarized glassy substrate has been developed in collaboration with Dr. Marc Dussauze of the University of Bordeaux
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.
Повний текст джерелаID: 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
Chan, Ka-man Carmen, and 陳嘉敏. "Design and synthesis of luminescent branched multinuclear platinum(II)alkynyl complexes and the study of their two-photon absorptionproperties." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B43703653.
Повний текст джерелаGiraud, Marion. "Nouveaux diaryléthènes photochromes et photo-commutation des propriétés optiques et magnétiques à l'échelle moléculaire." Paris 11, 2005. http://www.theses.fr/2005PA112241.
Повний текст джерелаThis work deals with the syntheses and the characterisations of compounds which are at the crossing of both photochromism and coordination chemistry and whose properties are photo-switchable. These compounds have attracted many interest in the scientific world for they can potentially be used in optoelectronics and photonic devices. We report here on the syntheses and characterisations of chelating diarylethenes and their use as bridges between metallic centres. Dinuclear complexes have been obtained and the Electronic Paramagnetic Resonance investgations, mainly dedicated to the study of a Cu(II) dinuclear complex, have shown both the reversible changes in the magnetic properties of this complex and the reversible release of the metal ion in solution upon irradiation. A structure of a closed isomer of this compound has been obtained. Synthetic methods have been used to bind more chelating sites to the perfluorated core : the post-functionnalisation way has been the most successful of many attempts, leading to new diarylethenes with 4 or 5 donating atoms. Eventually, Non Linear Optics-designed compounds are also described and their luminescence and Second Harmonic Generation switching properties are also reported
Ring, Josh. "Novel fabrication and testing of light confinement devices." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/novel-fabrication-and-testing-of-light-confinement-devices(51572720-0c49-482e-8523-e44ca877117f).html.
Повний текст джерелаChan, Ka-man Carmen. "Design and synthesis of luminescent branched multinuclear platinum(II) alkynyl complexes and the study of their two-photon absorption properties." Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B43703653.
Повний текст джерела