Zaloguj się

Gotowe bibliografie tematyczne / Photon luminescence

Spis treści

Artykuły w czasopismach
Rozprawy doktorskie
Książki
Części książek
Streszczenia konferencji
Raporty organizacyjne

Gotowa bibliografia na temat „Photon luminescence”

Autor: Grafiati

Data publikacji: 6 września 2023

Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych

Wybierz rodzaj źródła:

Zobacz listy aktualnych artykułów, książek, rozpraw, streszczeń i innych źródeł naukowych na temat „Photon luminescence”.

Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.

Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.

Artykuły w czasopismach na temat "Photon luminescence"

1

Petrov, Yu V., O. F. Vyvenko, O. A. Gogina, K. Bolotin, S. Kovalchuk, K. Watanabe i T. Taniguchi. "Cathodoluminescence of carbon-related defects in hexagonal boron nitride". Journal of Physics: Conference Series 2103, nr 1 (1.11.2021): 012065. http://dx.doi.org/10.1088/1742-6596/2103/1/012065.

Pełny tekst źródła

Streszczenie:

Abstract Hexagonal boron nitride is a wide band gap semiconductor exhibiting various luminescence bands in visible and near ultraviolet range, which can be used as single photon source. The luminescence band with zero phonon line at 4.1 eV is commonly ascribed to the carbon impurity introduced during crystal growth. In this paper we provide experimental evidence that carbon-related luminescent centers can be introduced in hBN by local electron irradiation in the chamber of scanning electron microscope at room temperature that can be used as a technique for the nanofabrication of single photon source devices with desired pattern.

Style APA, Harvard, Vancouver, ISO itp.

2

Тютрин, А. А., Д. С. Глазунов, А. Л. Ракевич i Е. Ф. Мартынович. "Формирование тонкого люминесцирующего слоя в кристаллах LiF под действием излучения тлеющего разряда". Письма в журнал технической физики 44, nr 15 (2018): 12. http://dx.doi.org/10.21883/pjtf.2018.15.46435.17145.

Pełny tekst źródła

Streszczenie:

AbstractThe formation of thin layers of luminescent defects on the faces of planar lithium fluoride crystals located in the positive column and Faraday dark space of a glow gas discharge was studied by time-resolved confocal scanning luminescent microscopy and time-correlated single photon counting. The formation of aggregated color centers in the surface layers of crystals was established using the spectral and kinetic characteristics of luminescence appearing after irradiation. The role of gas discharge electrons, ions, and photons in the defect formation mechanism was considered. The defects were shown to be formed under the influence of vacuum ultraviolet (VUV) photons. The VUV radiation intensity distribution in the discharge gap was measured by the method of thermostimulated luminescence. The main source of this radiation was the anodic and cathodic voltage drop regions in a glow discharge.

Style APA, Harvard, Vancouver, ISO itp.

3

Yamshchikov, V. M. "Influence of a Scattering Medium Consisting of Potassium Atoms on the Luminescent Signal Decay Time: Theoretical Investigation by Monte Carlo Method". Herald of the Bauman Moscow State Technical University. Series Natural Sciences, nr 3 (102) (czerwiec 2022): 69–85. http://dx.doi.org/10.18698/1812-3368-2022-3-69-85.

Pełny tekst źródła

Streszczenie:

The study solves the problem of the luminescent photons propagation in a resonantly absorbing medium consisting of atoms of the studied substance and a buffer inert gas. The Monte Carlo method was used in numerical experiments carried out to simulate real processes that occur in a chamber designed to determine the lifetime of an individual atom in an excited state by the method of measuring the luminescence intensity decay time. Findings of the research show that when luminescent photons are repeatedly scattered (scattering means the process of absorption and re-emission of a photon by an atom) in a medium, the luminescence decay time noticeably increases, reaching a value greater than the average lifetime of an individual atom in an excited state. The reflection of photons from the walls that make up the chamber can lead to errors in measuring the lifetime. The process of luminescence decay is studied theoretically for various detunings of the laser frequency from the resonant transition frequency. A three-level model of the atom and a model of complete frequency redistribution were applied. The study describes an algorithm based on the Monte Carlo method, which is used to model the three-level population kinetics, laser radiation transfer, radiation trapping, and frequency redistribution

Style APA, Harvard, Vancouver, ISO itp.

4

Molinaro, Céline, Sylvie Marguet, Ludovic Douillard, Fabrice Charra i Céline Fiorini-Debuisschert. "From plasmon-induced luminescence enhancement in gold nanorods to plasmon-induced luminescence turn-off: a way to control reshaping". Physical Chemistry Chemical Physics 20, nr 17 (2018): 12295–302. http://dx.doi.org/10.1039/c8cp00867a.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

5

Zeng, Cheng-Hui, Jing-Ling Wang, Yang-Yi Yang, Tian-Shu Chu, Sheng-Liang Zhong, Seik Weng Ng i Wing-Tak Wong. "Lanthanide CPs: the guest-tunable drastic changes of luminescent quantum yields, and two photon luminescence". J. Mater. Chem. C 2, nr 12 (2014): 2235–42. http://dx.doi.org/10.1039/c3tc32309a.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

6

Placide, Virginie, Anh Thy Bui, Alexei Grichine, Alain Duperray, Delphine Pitrat, Chantal Andraud i Olivier Maury. "Two-photon multiplexing bio-imaging using a combination of Eu- and Tb-bioprobes". Dalton Transactions 44, nr 11 (2015): 4918–24. http://dx.doi.org/10.1039/c4dt03115f.

Pełny tekst źródła

Streszczenie:

Two europium and terbium luminescent bio-probes whose luminescence can be sensitized by a two-photon sensitisation process have been designed and the proof-of-concept of biphotonic multiplexing experiment is described.

Style APA, Harvard, Vancouver, ISO itp.

7

Korepanov, Vladimir I., Pavel V. Petikar i Guang Hui Ge. "Luminescence of LiF Crystals Doped with Metal Oxide Impurities". Key Engineering Materials 685 (luty 2016): 623–26. http://dx.doi.org/10.4028/www.scientific.net/kem.685.623.

Pełny tekst źródła

Streszczenie:

The luminescence spectra and luminescence excitation spectra have been investigated in the spectral range of 6.5–4.4 eV. Pulsed cathodoluminescence of LiF-WО3 and LiF-TiО2 crystals has been studied in the temperature range of 20–300 K. All LiF crystals doped with metal oxides are found to have similar luminescent properties and identical structure of the luminescence centers. It is assumed that photon and electron bombardment induces excitation of different types of О2− oxygen centers perturbed by impurities and Fe2О3, WО3 and TiО2 included in the oxygen complexes.

Style APA, Harvard, Vancouver, ISO itp.

8

Mishra, K. C., J. K. Berkowitz, E. A. Dale, T. P. Das i K. H. Johnson. "Cooperative two-photon luminescence". Journal of Luminescence 46, nr 4 (maj 1990): 209–15. http://dx.doi.org/10.1016/0022-2313(90)90016-5.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

9

Gruzintsev A.N. "Optical modulation of anti-stokes photoluminescence of the Y-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Er". Physics of the Solid State 64, nr 7 (2022): 831. http://dx.doi.org/10.21883/pss.2022.07.54589.320.

Pełny tekst źródła

Streszczenie:

The luminescence and excitation spectra of visible photoluminescence of Y2O2S : Er ceramics (1 at.%) at different optical pumping have been studied. It is shown that the anti-Stokes luminescence of single crystals doped with erbium has a high intensity when pumping the metastable state 4I13/2 of impurities. The resonant wavelengths of IR-photons for two-photon excitation of the visible glow Y2O2S : Er. are determined. A method of photooptical modulation of anti-Stokes luminescence has been developed, which makes it possible to determine the nature of the corresponding electronic transitions inside the excited glow centers. Keywords: Luminescence, excitation, photooptical modulation.

Style APA, Harvard, Vancouver, ISO itp.

10

Khodrog, Osama, Norlaili Kabir, Xue Gong, Qinghai Yuan i Jianhua Liu. "Scintillation and Luminescence Properties of the Zinc Oxide (ZnO) Doped Frit Crystal Under Gamma Radiation". Journal of Nanoelectronics and Optoelectronics 15, nr 5 (1.05.2020): 566–73. http://dx.doi.org/10.1166/jno.2020.2765.

Pełny tekst źródła

Streszczenie:

The main objective of this study is to determine the characteristics of the scintillation and luminescent for Zinc Oxide (ZnO). Two groups of ZnO were prepared: pure (P338) and doped (P338Frit). This study investigates the scintillation and luminescent properties of the prepared ZnO in both powder and crystal forms. The NaI(Tl) scintillator is used as a tool for the control scintillator. It is a crystal that is commercially utilized in many radiation detecting fields. The P338 and P338Frit were used as the scintillator in the experimental setup. The P338 and P338Frit were bombarded with gamma photons of 241Am and 137Cs. The set up was connected to Multichannel Analyzer (MCA) to analyse its gamma spectrum. The scintillation occurrence is followed by the occurrence of luminescence in order for photon interactions to be detected by the MCA system. The photons detected are called count. However, self-absorption of the light is common which prevail the count from being recorded even though the scintillation occurs. The Compton continuum and photoelectric peak of the interaction were not distinguished. In conclusion, the characteristics of the luminescence and scintillation for the prepared ZnO were observed, however, the gamma spectrum peaks recorded were inconclusive.

Style APA, Harvard, Vancouver, ISO itp.

Więcej źródeł

Rozprawy doktorskie na temat "Photon luminescence"

1

Ogurtsov, Alexander, Olga Bliznjuk i Nataliia Masalitina. "Crystal size effect in polaritonic luminescence from atomic cryocrystals". Thesis, Hyogo University, 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/44703.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

2

Shastri, Vasant. "Single-photon-counting technique for luminescence spectra and decay measurements". Ohio : Ohio University, 1987. http://www.ohiolink.edu/etd/view.cgi?ohiou1183060409.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

3

McFee, 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.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

4

Balasubramanian, 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.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

5

Ghenuche, 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.

Pełny tekst źródła

Streszczenie:

Esta tesis describe el diseño, la fabricación y la caracterización óptica de sistemas plasmónicos resonantes capaces de confinar y aumentar campos de luz en la escala manométrica. En primer lugar, se utilizaron modelos numéricos 3D para diseñar diferentes geometras de nanoestructuras plasmónicas acopladas, a través del cálculo de la respuesta óptica de su campo lejano y cercano. Sobre la base de estas simulaciones se fabricaron las nanoestructuras por litografía de haz electrónico. Se puso especial énfasis en el aumento de la resolución y la optimización de la reproducibilidad de parámetros críticos como la forma de las partículas y el gap entre ellas. Por último, se empleó espectroscopía de campo lejano combinada con espectroscopía de luminiscencia inducida por dos fotones (TPL) para sondar la respuesta óptica local de las geometrías optimizadas. Hemos centrado nuestra atención en diferentes tipos de estructuras metálicas: dímeros, antenas con gap, conjuntos finitos de partículas en cadenas y en forma de estrella. Los dímeros tienen una fuerte amplificación del campo en su gap nanométrico por el acoplamiento en campo cercano de sus resonancias plasmonicas dipolares. Análogamente, antenas con gap, formadas por dos barras de oro adyacentes que soportan resonancias multipolares, pueden acoplar de manera eficiente la luz y concentrarla en volúmenes pequeños. Se ha demostrado que cadenas finitas de partículas son buenos candidatos para guiar la luz a través de secciones transversales por debajo de la longitud de onda y aquí demostramos que también se pueden utilizar como nanolentes capaces de concentrar la luz en su extremo. La distribución del campo cercano en conjuntos de partículas de oro en forma de estrella presenta una fuerte dependencia con la polarización del campo incidente que puede ser explotada para dirigirse dinámicamente a nano-objetos. La espectroscopía de campo lejano de conjuntos de dímeros y de cadenas finitas de partculas se comparó con la espectroscopía de TPL. Nuestro principal resultado es mostrar que la TPL es preferentemente sensible a los campos locales, permitiendo evaluar características espectrosc ópicas que no podrían resolverse de otro modo. A fin de superar las limitaciones de las medidas de conjuntos, en una segunda etapa se dedicó un considerable esfuerzo a construir y optimizar un montaje óptico para medir la señal de TPL de estructuras únicas. El uso de la micro-espectroscopía de TPL permitió obtener mapas espectrales de los modos de antenas aisladas con resolución espacial. Como se predijo mediante cálculos, hemos sido capaces de visualizar directamente, en la resonancia, la señal de TPL amplificada dentro del gap. Nuestros resultados muestran cómo las medidas de TPL pueden compararse directamente con la distribución de la cuarta potencia del campo local calculado. Mediante el análisis de la evolución de la señal de TPL en función de la longitud de onda incidente en el gap y en las extremidades de la antena tenemos más conocimiento sobre el mecanismo físico detrás de la resonancia de la antena. Finalmente, la microscopía de TPL se utilizó para sondar el campo cercano para diferentes orientaciones de la polarización lineal incidente sobre los conjuntos de partículas en forma de estrella. Se demuestra que, a diferencia del espectro de dispersión, la distribución de TPL en la estructura depende drásticamente del estado de polarización incidente. Nuestro estudio aporta una contribución significativa al campo de la óptica de plasmones, proponiendo nuevas geometrías para confinar de manera eficiente los campos ópticos a la escala nanometrica, aportando un profundo conocimiento sobre el uso de micro-espectroscopa de TPL como sonda óptica local. Nuestros resultados tendrán importancia en aplicaciones tales como espectroscopía mejorada, biosensores y la interacción luz-materia, donde se necesita evaluar el campo experimentado por una pequeña cantidad de materia cercana a la nanoestructura.
This 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.

Style APA, Harvard, Vancouver, ISO itp.

6

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.

Pełny tekst źródła

Streszczenie:

Dans les dernières années nombre de matériaux lamellaires à dimensions réduites ont démontré des propriétés optiques remarquables. Cependant, la plupart des études ont porté sur le système parfait et le rôle des défauts en tant que centres optiques actifs restent encore largement inexploré. Le nitrure de bore hexagonal (h-BN) est l'un des candidats les plus prometteurs pour les dispositifs émetteurs de lumière dans la région de l’UV lointain, présentant une forte émission excitonique à 5,8 eV. Cependant, émission n’apparaît uniquement que dans des monocristaux très purs qui peuvent difficilement être obtenus que par des procédés de synthèse complexes. Les échantillons ordinaires de h-BN présentent des spectres d'émission plus complexes qui ont été généralement été attribuée à la présence de défauts structuraux. Malgré un grand nombre d'études expérimentales jusqu'à présent il n'a pas été possible d'attribuer cette émission additionnelle à des défauts structuraux bien définis. Nous abordons ici cette question fondamentale en adoptant une approche théorique et expérimentale combinant une technique de cathodoluminescence nanométriquement résolu avec une caractérisation structural résolu atomiquement par microscopie électronique a transmission et de l'état de l'art de simulations excitoniques. Très récemment, l'équipe d'Orsay a mis au point un système de détection de cathodoluminescence intégré au sein d'un microscope électronique à transmission à balayage. Cette expérience unique est maintenant en mesure de fournir des spectres d'émission complet avec une résolution aussi faible que quelques dizaines de MeV associés à une taille de sonde électronique du nanomètre. Une image hyper-spectrale cathodoluminescence peut donc être enregistrée en parallèle avec une image HAADF. La cathodoluminescence résolu au nanomètre sur quelques-couche chimiquement exfoliée de h-BN a montré que les spectres d'émission sont fortement inhomogènes dans les feuillets individuels. Les pics d'émission à proximité de l'exciton libre apparaissent dans des régions étendues. Les examens complémentaires par microscopie électronique à transmission à haute résolution permettent d'associer ces raies d'émission avec des défauts étendue dans le cristal tels que les défauts d'empilement et les plis des facetter. Au moyen de calculs ab-initio dans le cadre de la « Many Body perturbation theory » (GW) et l'équation de Bethe-Salpeter nous fournissons une description détaillée de la structure électronique et la réponse spectroscopique du nitrure de bore hexagonal en présence de défaut d’empilements. En particulier, nous montrons un bon accord avec les résultats expérimentaux, les excitons supplémentaires sont associées à des changements de symétrie locaux qui se produisent par des fautes d'empilement dans le cristal. Ce résultat sera ensuite étendu à des nanotubes de BN à parois multiples. Des émissions supplémentaires qui apparaissent à l'intérieur du gap présentent une localisation spatiale élevée, typiquement inférieure à 100 nm, et par conséquent ils peuvent être liés à des défauts ponctuels individuels. Lorsqu’ils sont adressés individuellement à travers une sonde électronique très ciblé, ils pourraient avoir un caractère d’émetteur de photon unique. Cette hypothèse a été récemment confirmée par des expériences combinant notre système de cathodoluminescence avec un interféromètre Handburry-Brown et Twiss (HBT)
Within 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

Style APA, Harvard, Vancouver, ISO itp.

7

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.

Pełny tekst źródła

Streszczenie:

Photon energy upconversion (UC), a process that can convert two or more photons with low energy to a single photon of higher energy, has the potential for overcoming the thermodynamic efficiency limits of sunlight-powered devices and processes. An attractive route to lowering the incident power density for UC lies in harnessing energy transfer through triplet-triplet annihilation (TTA). To maximize energy migration in multicomponent TTA-assisted UC systems, triplet exciton diffusivity of the chromophores within an inert medium is of paramount importance, especially in a solid-state matrix for practical device integration. In this thesis, low-threshold sensitized UC systems were fabricated and demonstrated by a photo-induced interfacial polymerization within a coaxial-flow microfluidic channel and in combination with nanostructured optical semiconductors. Dual-phase structured uniform UC capsules allow for the highly efficient bimolecular interactions required for TTA-based upconversion, as well as mechanical strength for integrity and stability. Through controlled interfacial photopolymerization, diffusive energy transfer-driven photoluminescence in a bi-molecular UC system was explored with concomitant tuning of the capsule properties. We believe that this core-shell structure has significance not only for enabling promising applications in photovoltaic devices and photochromic displays, but also for providing a useful platform for photocatalytic and photosensor units. Furthermore, for improving photon upconverted emission, a photonic crystal was integrated as an optical structure consisting of monodisperse inorganic colloidal nanoparticles and polymer resin. The constructively enhanced reflected light allows for the reuse of solar photons over a broad spectrum, resulting in an increase in the power conversion efficiency of a dye-sensitized solar cell as much as 15-20 %.

Style APA, Harvard, Vancouver, ISO itp.

8

Vezzoli, S. "EXPERIMENTAL STUDY OF NANOCRYSTALS AS SINGLE PHOTON SOURCES". Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/222688.

Pełny tekst źródła

Streszczenie:

Wet-chemically synthesized colloidal nanocrystals are promising single photon emitters at room temperature, due to the strong quantum confinement induced by the small dimensions. However, their applications have been so far limited by two main drawbacks: the blinking of their photo-luminescence and a non-polarized emission. This manuscript is consecrated to the study of the optical properties of a particular type of colloidal nanocrystals, called dot-in-rod (DR), in which a spherical CdSe core is surrounded by a rod-like CdS shell. We demonstrate for the first time a suppression of the blinking in thick shell DRs. In contrast to spherical nanocrystals, we show that it can be obtained while keeping a good quality of the single photon emission and a high degree of linear polarization. A complete room-temperature characterization of the optical, and especially quantum optical, properties of DRs is provided for several geometrical parameters. In particular, an original approach, based on an ensemble photoluminescence measurement, is developed to assess the quality of a sample of nanocrystals as single photon sources. By studying single DRs in a confocal microscope, we analyze the influence of the core size and of the shell thickness and length on the photon anti-bunching, radiative lifetime and polarization of the emission. This systematic study brings a contribution to the understanding of the interaction processes of the confined carriers in semiconductor nanocrystals. The interplay of radiative and non-radiative recombinations and, in particular, the role of the Auger effect in the photo-luminescence blinking and in the emission of non-classical light are deeply investigated.

Style APA, Harvard, Vancouver, ISO itp.

9

Dehlinger, 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.

Pełny tekst źródła

Streszczenie:

Les microscopes en champ proche permettent d'obtenir la topographie d'un échantillon avec une résolution pouvant atteindre la résolution atomique. Les spectroscopies de rayons-X sont des méthodes de caractérisation qui permettent de déterminer la composition et la structure élémentaire de l'échantillon avec une précision inférieure à l'Ångström. Nous avons choisi de coupler ces deux techniques en collectant localement la luminescence visible issue de l'échantillon par la pointe-sonde d'un microscope à force de cisaillement, constituée d'une fibre optique effilée de faible ouverture. Cette technique a été utilisée pour caractériser des échantillons semiconducteurs micro- et nano-structurés afin d'en obtenir simultanément la topographie et la cartographie de luminescence locale. Afin de pouvoir étendre ce concept à d'autres types de matériaux, la faisabilité de la collecte de la fluorescence X locale a été évaluée avec la microsource. Pour cela la fluorescence X émise par un échantillon a été collectée par un capillaire cylindrique équipant un détecteur EDX. L'influence du diamètre du capillaire sur le niveau de signal a été mesurée. Une simulation numérique a été développée afin d'estimer le niveau de signal obtenu en utilisant un capillaire de 1 µm de diamètre et d'optimiser la géométrie du système. En couplant la microscopie en champ proche et l'analyse XRF, à la lumière de ces résultats, il sera possible d'atteindre 100 nm de résolution latérale en environnement synchrotron et moins de 1 µm à l'aide d'une source de laboratoire. Il serait alors possible de sélectionner un objet particulier sur une surface et d'en faire l'analyse élémentaire
Scanning 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

Style APA, Harvard, Vancouver, ISO itp.

10

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.

Pełny tekst źródła

Streszczenie:

Nous avons travaillé sur le développement d’un instrument de mesure de la luminescence induite par un faisceau d’ions lourds (nucléons  12) et d’énergie de l’ordre du MeV/nucléons. Basé sur une méthode de comptage de photons uniques obtenus par coïncidences, le dispositif permet d’obtenir sur 16 voies à la fois un spectre en énergie dans le domaine proche UV-visible-proche IR (185-920 nm) et la réponse temporelle sur la gamme ns-µs, avec un échantillonnage de 100 ps. Des mesures en température peuvent être réalisées depuis la température ambiante jusqu’à 30K.Ce travail met particulièrement l’accent sur les méthodes d’extraction des données : Une fois montrée la nécessité de déconvoluer les signaux, on s’intéresse dans un premier temps à évaluer différents profils instrumentaux modélisés et reconstruit à partir de mesures. A cet effet, un travail de caractérisation temporelle de chaque constituant du dispositif est mené. Puis ces profils instrumentaux sont utilisés dans deux méthodes de déconvolution par moindres carrés d’abord puis par maximum d’entropie ensuite.Deux matériaux types sont testés : Le Titanate de Strontium pour l’étude de la dynamique de l’excitation électronique, et un scintillateur plastique commercial, le BC400, pour l’étude du vieillissement et de la baisse des performances en fonction de la fluence. Dans les deux cas on a pu mettre en évidence la présence d’une composante ultra rapide de constante de temps subnanoseconde
We 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

Style APA, Harvard, Vancouver, ISO itp.

Więcej źródeł

Książki na temat "Photon luminescence"

1

Aitken, M. J. An introduction to optical dating: The dating of Quaternary sediments by the use of photon-stimulated luminescence. Oxford: Oxford University Press, 1998.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

2

Collis, N. D. Spatially resolved photo-luminescence and exciton diffusion in semiconductors. Manchester: UMIST, 1994.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

3

In vivo clinical imaging and diagnosis. New York: McGraw-Hill, 2011.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

4

Aitken, M. J. Introduction to Optical Dating: The Dating of Quaternary Sediments by the Use of Photon-Stimulated Luminescence. Oxford University Press, 1998.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

5

Popp, Jurgen, i Marion Strehle. Biophotonics: Visions for Better Health Care. Wiley-VCH, 2006.

Znajdź pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Części książek na temat "Photon luminescence"

1

Zhang, Fan. "General Introduction to Upconversion Luminescence Materials". W Photon Upconversion Nanomaterials, 1–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45597-5_1.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

2

Zhang, Fan. "Upconversion Luminescence of Lanthanide Ion-Doped Nanocrystals". W Photon Upconversion Nanomaterials, 73–119. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45597-5_3.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

3

Burdick, G. W., i M. C. Downer. "One-photon rare earth optical transitions: recent theoretical developments". W Solid State Luminescence, 97–131. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1522-3_4.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

4

Angelini, Angelo. "Ring Antennae: Resonant Focusing and Collimated Extraction of Luminescence". W Photon Management Assisted by Surface Waves on Photonic Crystals, 45–60. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50134-5_3.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

5

Reisler, Hanna, i Curt Wittig. "Electronic Luminescence Resulting from Infrared Multiple Photon Excitation". W Advances in Chemical Physics, 679–711. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470142677.ch14.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

6

Takagi, Y., i K. Yoshihara. "Two-Photon Absorption Sampling Spectroscopy for Fast Transient Luminescence Measurements". W Ultrafast Phenomena VI, 407–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83644-2_116.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

7

D'Aléo, Anthony, Chantal Andraud i Olivier Maury. "Two-photon Absorption of Lanthanide Complexes: from Fundamental Aspects to Biphotonic Imaging Applications". W Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials, 197–230. Chichester, United Kingdom: John Wiley & Sons Ltd, 2014. http://dx.doi.org/10.1002/9781118682760.ch05.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

8

Heist, P., R. Deich, F. Noack, W. E. Postovalov, W. Rudolph i T. Schröder. "Two-Photon Luminescence in CsI:Na and Its Application for the Measurement of UV Femtosecond Light Pulses". W Springer Proceedings in Physics, 125–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75826-3_24.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

9

Hasegawa, Miki, i Yasuchika Hasegawa. "Triboluminescence of Lanthanide Complexes". W The Materials Research Society Series, 105–30. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0260-6_7.

Pełny tekst źródła

Streszczenie:

AbstractThe photoluminescence of lanthanide complexes originating from f–f transitions is generally sensitized through energy transfer from the ligand to the lanthanide ion in the excited state under UV irradiation. This phenomenon is known as the photo-antenna effect. Luminescence driven by mechanical stimuli, such as tapping or rubbing, is called mechanoluminescence or triboluminescence (TL). In recent years, reports on TL in rare-earth complexes, which have attracted attention as novel luminescent materials that do not require an electrical excitation source, have steadily increased. In this chapter, we focus on triboluminescent lanthanide complexes. Specifically, we introduce the history and detection methods of TL and cite recent examples of materials demonstrating this phenomenon, particularly coordination polymer-like and discrete molecular crystalline lanthanide complexes. Finally, we summarize the application prospects of these complexes as soft crystals.

Style APA, Harvard, Vancouver, ISO itp.

10

Kumar, Vinod, Leta Tesfaye Jule i Krishnaraj Ramaswamy. "Photon Conversion in Perovskite Solar Cells". W Luminescent Nanomaterials, 363–81. New York: Jenny Stanford Publishing, 2022. http://dx.doi.org/10.1201/9781003277385-12.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Streszczenia konferencji na temat "Photon luminescence"

1

Ruan, Xiulin, i Massoud Kaviany. "Temperature-Dependent Luminescence Quenching in Random Nano Porous Media". W ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60363.

Pełny tekst źródła

Streszczenie:

The luminescence quenching of a random, crystalline one-dimensional model porous medium doped with rare-earth elements, is analyzed by considering the transport, transition, and interaction of the fundamental energy carriers. The quenching in nano porous media is enhanced compared to a single crystal, due to multiple scattering, enhanced absorption, and low thermal conductivity. The coherent wave treatment is used to calculate the photon absorption, in order to allow for field interference and enhancement. The luminescent and thermal emission is considered as incoherent. The luminescence quenching and non-linear thermal emission, occurring with increasing irradiation intensity, are predicted.

Style APA, Harvard, Vancouver, ISO itp.

2

Lu, Jun, Mucui Ni, Jing Zhang, Yafu Chen i Lianchun Sun. "Photon restricting effect in porous silocon luminescence". W Photonics Asia 2002, redaktorzy Guoguang Mu, Francis T. S. Yu i Suganda Jutamulia. SPIE, 2002. http://dx.doi.org/10.1117/12.483236.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

3

Lounis, Brahim. "Single semiconductor nanocrystals luminescence decay and photon statistics". W International Quantum Electronics Conference. Washington, D.C.: OSA, 2004. http://dx.doi.org/10.1364/iqec.2004.ithj3.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

4

Samartsev, V. V. "Optical Data Processing Using Photon Echoes". W Spectral Hole-Burning and Luminescence Line Narrowing: Science and Applications. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.tha4.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

5

Bauer, R., T. Attenberger, I. Sildos, U. Bogner i Max Maier. "Persistent Spectral Hole-Burning by cw lasers in Defect-Aggregates Induced by Particle Irradiation". W Spectral Hole-Burning and Luminescence Line Narrowing: Science and Applications. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.tub2.

Pełny tekst źródła

Streszczenie:

In different color centers of neutron- irradiated and annealed sapphire crystals persistent spectral holes could be burned which were thermoresistant up to 670K [1]. In the 755.6nm zero-phonon line (ZPL) two-color photon-gated persistent spectral hole-burning (PSHB) was obtained with pulsed dye-lasers [2]. Preliminary results of PSHB with a cw laser were reported for the 462.5nm ZPL [3]. The present study concerns a investigation of PSHB with cw-lasers in different ZPL, including the 755.6nm ZPL, which is interesting for potential applications in particular because diode lasers are available in this spectral range.

Style APA, Harvard, Vancouver, ISO itp.

6

Parigger, Christian, i Lloyd m. Davis. "Photon counting fluorimetry of low repetition rate pulsed plasmas". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wy4.

Pełny tekst źródła

Streszczenie:

For the ill-conditioned problem of resolving multiple exponential components from luminescence decay profiles, time correlated photon counting (TCPC) is usually chosen because it yields data over a large dynamic range and with accurately known errors, derived from Poisson photon statistics. However, as no more than one photon is collected after each excitation, TCPC requires a large number of laser pulses to achieve the required dynamic range.

Style APA, Harvard, Vancouver, ISO itp.

7

Orrit, M., i J. Bernard. "Single Molecule Spectroscopy : Photon Correlation And Electric Field Effect." W Spectral Hole-Burning and Luminescence Line Narrowing: Science and Applications. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.ma3.

Pełny tekst źródła

Streszczenie:

The first single molecule detection, by Moerner and colleagues [1] in the system pentacene in p-terphenyl crystal via absorption, has been extremely difficult due to photon noise. In our paper [2], we demonstrated for the first time single molecule lines in fluorescence excitation spectra of the same system. This much simpler method provides a dramatic improvement of the signal/noise ratio. It opened the way for a true single molecule spectroscopy (SMS). Since then, several experiments performed using this technique [3-8] have shown the power and promise of this new spectroscopic method. In this report, we want to apply SMS to obtain detailed information about individual molecules and the differences in some spectroscopic properties due to their local surroundings. We also report on preliminary results on electric field effects on single molecule lines.

Style APA, Harvard, Vancouver, ISO itp.

8

Jones, Scott C., Xiao-An Shen, Peter Braunlich i Paul Kelly. "Direct measurement of nonlinear energy deposition from an intense 532-nm photon field into alkali halides". W International Laser Science Conference. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.thl35.

Pełny tekst źródła

Streszczenie:

We describe a photoacoustic method for the direct measurement of the energy absorbed by wide-gap optical materials during non-linear interaction with intense laser beams and present results obtained with ultrapure NaCl crystals exposed to 80-ps pulses from a frequency-doubled Nd:YAG laser. The measured temperature rise of the interaction volume depends approximately on the fourth power of the laser peak flux F and exceeds 300 K at F = 1.45 × 1030 photons/cm2s without laser-induced breakdown. We find no evidence of free-electron avalanche formation up to these temperatures and show that the mechanism of energy deposition is four-photon electron-hole pair generation and subsequent single-photon absorption by free electrons and self-trapped holes with small contributions from self-trapped excitons. We report the first photoacoustically measured four-photon absorption cross section: σ(4) = 2 × 10-113cm8s3in NaCl for linearly polarized 532-nm photons. This value is corroborated by σ(4) = 0.94 × 10-113 cm8 s3 obtained in physically similar KBr at 40 K by measuring the recombination luminescence of four-photon-generated self-trapped excitons.

Style APA, Harvard, Vancouver, ISO itp.

9

Zalogina, Anastasia, Pavel Tonkaev, Aditya Tripathi, Hoo-Cheol Lee, Luca Carletti, Hong-Gyu Park, Sergey Kruk i Yuri Kivshar. "Observation of Giant Five-Photon Upconversion Luminescence in Subwavelength AlGaAs Resonators". W CLEO: QELS_Fundamental Science. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.fth4b.5.

Pełny tekst źródła

Streszczenie:

We design and fabricate individual subwavelength AlGaAs nanoantennas supporting Mie resonances in the mid-infrared spectral range. Near the resonant modes, we observe five-photon upconversion photoluminescence in the visible spectral range.

Style APA, Harvard, Vancouver, ISO itp.

10

Wang, Fan, Suriati Paiman, Qiang Gao, H. Hoe Tan, C. Jagadish i Peter J. Reece. "Two-Photon Luminescence Study of Optically Trapped InP Semiconductor Nanowires". W International Quantum Electronics Conference. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/iqec.2011.i792.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

Raporty organizacyjne na temat "Photon luminescence"

1

Saveleva, Viktoria. The use of a phosphor in light sources in a photo cabinet. Light sources with a phosphor in a photo cabinet using laser diodes. Intellectual Archive, lipiec 2023. http://dx.doi.org/10.32370/iaj.2903.

Pełny tekst źródła

Streszczenie:

Non-thermal luminescence of a substance is called luminescence. This process occurs by absorbing excitation energy. The substance itself is called a phosphor. In chemical nature, the phosphor is divided into two groups: organic and non-organic. In fluorescent lamps and other light sources, a non-organic phosphor is used. The main purpose of using phosphor in lighting fixtures is to save energy. Another significant factor is the availability and low cost in the market. And also, the variety of colors available on the market. The use of phosphors with laser diodes is a new direction in lighting devices. It represents a huge potential for the development of innovative space lighting technologies.

Style APA, Harvard, Vancouver, ISO itp.

Oferujemy zniżki na wszystkie plany premium dla autorów, których prace zostały uwzględnione w tematycznych zestawieniach literatury. Skontaktuj się z nami, aby uzyskać unikalny kod promocyjny!