Dynamical Processes of High Density Single Excitons and Excitonic Molecules in CdSe PDF Download
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Author: Hiroto Kuroda
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Author: Hiroto Kuroda
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Author: Nihon Butsuri Gakkai
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 1036
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Author: Kikuo Cho
Publisher: World Scientific
ISBN: 9789812811387
Category : Science
Languages : en
Pages : 506
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At Yamada Conference LIII, papers on many novel materials and on novel phenomena in condensed matter physics were presented OCo for instance, the achievement of simultaneous creation of excitons and free-electron-hole pairs in rare gas solids, and a low frequency fluctuation of the spectral shift of indirect excitons in GaAs coupled quantum wells. Single molecule spectroscopy is a powerful tool for studying molecules including biological systems; the study of delocalization of excitons in the photosynthetic light harvesting antenna system was also reported. The proceedings thus contain many excellent papers dealing with current research topics on the excitonic processes in bulk, quantum wells, quantum dots and other confined systems. This book will serve as an excellent source of recent references and reviews for a wide range of researchers in physics, chemistry, engineering and biological sciences. The proceedings have been selected for coverage in: . OCo Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings). Contents: Dynamical Process of Photoionization in Semiconductor Nanocrystals (M Y Shen et al.); Excitons on a 1D Periodic Conjugated Polymer Chain: Two Electronic Structures of Polydiacetylene Chains (C Lapersonne-Meyer); Anomalous Spectral Shifts of Indirect Excitons in Coupled GaAs Quantum Wells (D W Snoke et al.); Infrared Absorption by Excitons in Cuprous Oxide (M GAppert et al.); Theory of Excitation-Energy Transfer Processes Involving Optically Forbidden Exciton States in Antenna Systems of Photosynthesis (K Mukai et al.); Transient Grating Induced by Excitonic Polaritons in Thin Film Semiconductors (K Akiyama et al.); Excitonic Photoluminescence of Pentacene Single Crystal (T Aoki-Matsumoto et al.); Scanning Near-Field Optical Microspectroscopy of Single Perylene Microcrystals (J Niitsuma et al.); and other papers. Readership: Condensed matter physicists, materials scientists, chemists and biologists."
Author: Tōkyō Daigaku. Bussei Kenkyūjo
Publisher:
ISBN:
Category : Solids
Languages : en
Pages : 570
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Author: Thomas Stanley Bischof
Publisher:
ISBN:
Category :
Languages : en
Pages : 176
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This thesis focuses on studies of exciton and multiexciton dynamics in colloidal semiconductor nanocrystals. I concentrated primarily on the development of correlation spectroscopies for the measurement of the statistics and dynamics of multiexciton emission. Under most conditions, the emission properties of nanocrystals are dominated by the photophysics of the single-exciton state. However, due to high density of states nanocrystals can readily undergo several successive excitations, leading to multiexcitonic states with distinct dynamics. As nanocrystals are more frequently used under conditions of high excitation ux for light-emitting applications, the often destructive nature of multiexcitons are increasingly relevant. Prior work on multiexcitons has largely focused on the biexciton, and here we develop tools to directly study triexciton emission. First, we develop the theoretical and analytical apparatus for studying multiexciton emission. The model and software are general to arbitrary numbers of excitons and provide the framework for further correlation-based methods. The software is general and may be used in any photon-timing application. InAs is a promising candidate material as an infrared emitter for down-shifting and biological applications. In one study, we characterize the excitonic dynamics of individual InAs nanocrystals. We nd that the nanocrystals qualitatively behave like CdSe nanocrystals, in that they exhibit blinking, monoexponential radiative dynamics, and (generally) low biexciton quantum yield. In a separate set of experiments, we study the temperature-dependent exciton emission dynamics of InAs quantum dots and nd that their emission is well-described by existing excitonic ne-structure models. CdSe is the classical colloidal quantum dot material, and is the ideal testing ground for methods development. We apply new high-order correlation methods to study the emission statistics and dynamics of the triexciton, biexciton, and monoexciton at the single-molecule level. We nd that multiexcitonic states have no memory: the relaxation of a biexciton yields a monoexciton which behaves identically to one formed by a single-photon excitation. We discuss a few examples of materials which may exhibit exotic biexcitonic states. Next, we explore the use of infrared-emitting nanocrystals for deep-tissue imaging in biological research. Earlier work on the subject involved the use of emitters with significantly lower quantum yield, and we demonstrated a variety of applications which make use of the high quantum yield and chemical functionality of colloidal nanocrystals. We used the unique combination of chemical functionality and high emission quantum yield to perform studies in mice: non-invasive measurement of vital signs in awake mice; real-time metabolic imaging of lipoproteins in an intact mouse; vascular imaging and blood velocimetry in a mouse with a cranial window model. Finally we discuss a few project ideas which arose during the work on this thesis, but were not successfully completed.
Author: Nichigai Asoshiētsu
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 870
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Author: Nichigai Asoshiētsu
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 870
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Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1306
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 576
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Author: Joseph Franklin Figueira
Publisher:
ISBN:
Category : Cadmium selenide
Languages : en
Pages : 186
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