LUMINESCENCE DE TERRES RARES INCLUSES DANS UNE MATRICE D'OXYDE DE ZINC SEMI-CONDUCTEUR PDF Download
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Book Description
LE TRAVAIL PRESENTE CONCERNE LA LUMINESCENCE DE L'OXYDE DE ZINC SEMI-CONDUCTEUR DANS LEQUEL DES IONS TERRE RARE SONT INTRODUITS DELIBEREMENT. LES ETUDES STRUCTURALES REVELENT QUE LE TAUX DE DOPAGE DE LA TERRE RARE A UNE INFLUENCE IMPORTANTE SUR LA MICROSTRUCTURE DE L'OXYDE DE ZINC. LA PRESENCE DES IONS TERRE RARE CREEE DEUX TYPES DE CENTRES DE LUMINESCENCE QUI ONT ETE CHACUN MIS EN EVIDENCE GRACE A DIFFERENTS MODES D'EXCITATION. EN PHOTOLUMINESCENCE AINSI QUE SOUS POLARISATION DIRECTE, LA LUMINESCENCE RESULTE DE LA RECOMBINAISON DES PORTEURS SUR DES CENTRES PROPRES A ZNO: LA RECOMBINAISON BANDE A BANDE SOUS POLARISATION DIRECTE ET LA RECOMBINAISON SUR LES CENTRES AUTO-ACTIVES SOUS LES DEUX MODES D'EXCITATION. LE SPECTRE DE LA LUMINESCENCE ISSUE DE CES DERNIERS CENTRES PRESENTE DES STRUCTURES QUI ONT PU ETRE ATTRIBUEES A LA REABSORPTION PAR LA TERRE RARE DE LA LUMIERE EMISE PAR ZNO. EN ELECTROLUMINESCENCE SOUS POLARISATION ANODIQUE, L'EMISSION EST ISSUE DES NIVEAUX 4F DES IONS TERRE RARE EN RESULTAT D'UN MECANISME D'IMPACT-EXCITATION ELECTRONIQUE DE CES CENTRES. L'INTENSITE DE CETTE EMISSION SUIT BIEN UNE LOI D'ALFREY-TAYLOR ET ELLE EST FONCTION DE LA CONCENTRATION DE LA TERRE RARE, SA VALEUR ETANT MAXIMALE POUR ENVIRON 6 ATOMES POUR MILLE. L'APPROCHE CINETIQUE A PERMIS DE METTRE EN EVIDENCE UNE REACTION DE TRANSFERT D'ENERGIE ENTRE CENTRES RADIATIFS D'IONS DE MEME NATURE OU DE NATURES DIFFERENTES
Book Description
LE TRAVAIL PRESENTE CONCERNE LA LUMINESCENCE DE L'OXYDE DE ZINC SEMI-CONDUCTEUR DANS LEQUEL DES IONS TERRE RARE SONT INTRODUITS DELIBEREMENT. LES ETUDES STRUCTURALES REVELENT QUE LE TAUX DE DOPAGE DE LA TERRE RARE A UNE INFLUENCE IMPORTANTE SUR LA MICROSTRUCTURE DE L'OXYDE DE ZINC. LA PRESENCE DES IONS TERRE RARE CREEE DEUX TYPES DE CENTRES DE LUMINESCENCE QUI ONT ETE CHACUN MIS EN EVIDENCE GRACE A DIFFERENTS MODES D'EXCITATION. EN PHOTOLUMINESCENCE AINSI QUE SOUS POLARISATION DIRECTE, LA LUMINESCENCE RESULTE DE LA RECOMBINAISON DES PORTEURS SUR DES CENTRES PROPRES A ZNO: LA RECOMBINAISON BANDE A BANDE SOUS POLARISATION DIRECTE ET LA RECOMBINAISON SUR LES CENTRES AUTO-ACTIVES SOUS LES DEUX MODES D'EXCITATION. LE SPECTRE DE LA LUMINESCENCE ISSUE DE CES DERNIERS CENTRES PRESENTE DES STRUCTURES QUI ONT PU ETRE ATTRIBUEES A LA REABSORPTION PAR LA TERRE RARE DE LA LUMIERE EMISE PAR ZNO. EN ELECTROLUMINESCENCE SOUS POLARISATION ANODIQUE, L'EMISSION EST ISSUE DES NIVEAUX 4F DES IONS TERRE RARE EN RESULTAT D'UN MECANISME D'IMPACT-EXCITATION ELECTRONIQUE DE CES CENTRES. L'INTENSITE DE CETTE EMISSION SUIT BIEN UNE LOI D'ALFREY-TAYLOR ET ELLE EST FONCTION DE LA CONCENTRATION DE LA TERRE RARE, SA VALEUR ETANT MAXIMALE POUR ENVIRON 6 ATOMES POUR MILLE. L'APPROCHE CINETIQUE A PERMIS DE METTRE EN EVIDENCE UNE REACTION DE TRANSFERT D'ENERGIE ENTRE CENTRES RADIATIFS D'IONS DE MEME NATURE OU DE NATURES DIFFERENTES
Author: Ahmed Belasri Publisher: Springer Nature ISBN: 9811554447 Category : Technology & Engineering Languages : en Pages : 659
Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: Agnes Buka Publisher: World Scientific ISBN: 1848167997 Category : Science Languages : en Pages : 299
Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author: Paolo Mele Publisher: ISBN: 9781536160864 Category : Zinc oxide thin films Languages : en Pages : 0
Book Description
Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.
Author: Sébastien Forget Publisher: Springer ISBN: 3642367054 Category : Science Languages : en Pages : 179
Book Description
Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
Author: Fabien Bretenaker Publisher: World Scientific ISBN: 9814612421 Category : Science Languages : en Pages : 185
Book Description
This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.
Author: Jerome V. Moloney Publisher: Springer Science & Business Media ISBN: 9780387985817 Category : Business & Economics Languages : en Pages : 270
Book Description
Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Book Description
CE TRAVAIL EST CONSACRE A L'ETUDE DE LA LUMINESCENCE DES IONS DE TERRE RARE TRIVALENTS INSERES DANS L'OXYDE DE ZINC POLYCRISTALLIN. LES ETUDES STRUCTURALES DE NOS ECHANTILLONS ONT MONTRE QUE LA TERRE RARE EST LOCALISEE EN SURFACE DES GRAINS D'OXYDE DE ZINC AINSI QU'AUX JOINTS DE GRAINS. LA CLARIFICATION DU MECANISME DE L'ELECTROLUMINESCENCE DES TERRES RARES INSERES DANS L'OXYDE DE ZINC A ETE EFFECTUEE POUR DEUX DISPOSITIFS ELECTROLUMINESCENTS: LE PREMIER BASE SUR UNE JONCTION SEMI-CONDUCTEUR/ELECTROLYTE, LE SECOND EQUIVALENT A UNE VARISTANCE ETANT ENTIEREMENT SOLIDE. L'EXCITATION DES TERRES RARES S'OPERE PAR IMPACT DIRECT D'ELECTRONS CHAUDS ; CES ELECTRONS CHAUDS SONT GENEREES, SOIT PAR AVALANCHE DANS LA REGION DE CLAQUAGE DU SEMI-CONDUCTEUR POUR LE PREMIER DISPOSITIF ELECTROLUMINESCENT (CELLULE ELECTROCHIMIQUE), SOIT PAR EMISSION THERMOIONIQUE AUX JOINTS DE GRAINS DANS LA REGION DE PRECLAQUAGE POUR LE SECOND DISPOSITIF (VARISTANCE). LES MESURES D'ELECTROLUMINESCENCE ASSOCIEES A DES MESURES DE PHOTOLUMINESCENCE ONT CONSTITUE UN BON MOYEN POUR ATTRIBUER DES RAIES D'EMISSION DES IONS TRIVALENTS DE TERRES RARES. ENFIN, LES MESURES D'ELECTROLUMINESCENCE ONT PERMIS UNE EVALUATION APPROXIMATIVE DE LA TAILLE MOYENNE DES GRAINS D'OXYDE DE ZINC
Author: DJAKARIDIA.. KOUYATE
Author: DJAKARIDIA.. KOUYATE
Author: Ahmed Belasri
Author: Agnes Buka
Author: Paolo Mele
Author: Sébastien Forget
Author: Fabien Bretenaker
Author: Jerome V. Moloney
Author: International Atomic Energy Agency
Author: Universidade de Coimbra
Author: SAID.. BACHIR