Ru and Os Polypyridyl Complexes for Light Emitting and Molecular Electronics Applications PDF Download
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Author: Samuel Flores-Torres
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
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Author: Samuel Flores-Torres
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
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Author: Samuel Flores-Torres
Publisher:
ISBN: 9780542980848
Category :
Languages : en
Pages : 164
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We have also prepared and characterized a series of multimetallic oligomers of Ru using the pi-conjugated bridging ligand tetra-2-pyridyl-1,4-pyrazine (tppz), as well as mixed-ligand complexes with terpyridine end-caps, and analyzed their electrochemical and spectroscopic properties, comparing them with modern computational electronic structure methods. The results suggest that the high degree of metal-metal inter-unit communication in these linear oligomers yields low HOMO-LUMO gaps, high delocalization, and the onset of "quasi-band" features, all indicative that these compounds should be excellent molecular wire materials.
Author: 伍寶琼
Publisher:
ISBN: 9781374727823
Category :
Languages : en
Pages :
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This dissertation, "Molecular and Polymeric Metal Complexes for Electroluminescence Applications" by 伍寶琼, Po-king, Ng, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "MOLECULAR AND POLYMERIC METAL COMPLEXES FOR ELECTROLUMINESCENCE APPLICATIONS" submitted by Ng Po King For the degree of Doctor of Philosophy at the University of Hong Kong in August 1999 Different types of ruthenium or rhenium containing light-emitting conjugated polymers based on derivatives of poly(p-phenylenevinylene), poly(p-phenylene), and poly(phenylene thiophene) have been synthesized. The conjugated mainchain were functionalized with different electron-withdrawing ligands such as dipyridophenazine, oxadiazole, and phenanthroline. Their opto-electronic properties were studied By combining an efficient electron-transporting segment, a hole-transporting segment, and an emissive unit in a single polymer chain with optimized composition, the resulting polymer might possess balanced hole and electron transporting properties and thus enhance the associated electroluminescence efficiency. The metal containing polymerswere synthesized by palladium catalyzed coupling reactions. The properties of the polymers can be adjusted by changing the proportion of different monomers. Apart from the polymeric materials, several trifunctional light-emitting molecules based on rhenium(I) and ruthenium(II) bipyridine complexes were studied. The hole-transporting, electron-transporting, and light-emitting functional groups are incorporated into one single molecule. The complexes were doped in different polymer hosts and their charge transport and luminescent properties were studied. The charge transports of all polymeric and molecular materials are dispersive in nature with non-Gaussian carrier distribution. It was also found that the hole and electron carrier mobilities are similar and of the order of lO DEGREESlO"5 crn DEGREESV''V1, which are both electric field and temperature dependent. The plots of In ju vs. Em show that the charge carrier mobilities decrease with increasing electric field, which suggests the presence of the off-diagonal disorder in the hopping sites. In general, the electron carrier mobilities are slightly higher than those of the hole carrier. This may due to the participation of the electron-withdrawing ligand. Moreover, the electron and hole mobilities of the metal containing polymers are approximately one order of magnitude higher than those of the metal free polymers. This is attributable to the presence of ruthenium complexes which play an important role as charge carrier. The light emitting properties of the polymeric and molecular materials are reported. In some polymers, the emission properties were influenced by the metal complexes and their content. An energy transfer process between the polymer main- chain and the metal center is proposed. Single layer light emitting devices were fabricated and subjected to forward bias. The electroluminescent spectral features resemble those of the photoluminescent spectra, indicating the same type of excitationsand energy bands involved in both photoexcitation and carrier injection by external voltage. Depending on the metal complex content, the polymers exhibit different EL spectra. The devices exhibit low turn-on voltage (5-10 V) and external quantum efficiency of 0.15-0.6 %. By using different metal complex monomers, it is capable of preparing metal-containing polymers with different emission colors and charge transport properties. DOI: 10.5353/th_b2986630 Subjects: Polymeric composites Electrolumi
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 946
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Author:
Publisher: ScholarlyEditions
ISBN: 1464990468
Category : Technology & Engineering
Languages : en
Pages : 14170
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Advances in Nanotechnology Research and Application / 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Nanotechnology. The editors have built Advances in Nanotechnology Research and Application / 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Nanotechnology in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Advances in Nanotechnology Research and Application / 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author: Grazyna Stochel
Publisher: John Wiley & Sons
ISBN: 9781405193276
Category : Science
Languages : en
Pages : 398
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Book Description
Bioinorganic photochemistry is a rapidly evolving field integrating inorganic photochemistry with biological, medical and environmental sciences. The interactions of light with inorganic species in natural systems, and the applications in artificial systems of medical or environmental importance, form the basis of this challenging inter-disciplinary research area. Bioinorganic Photochemistry provides a comprehensive overview of the concepts and reactions fundamental to the field, illustrating important applications in biological, medical and environmental sciences. Topics covered include: Cosmic and environmental photochemistry Photochemistry of biologically relevant nanoassemblies Molecular aspects of photosynthesis Photoinduced electron transfer in biosystems Modern therapeutic strategies in photomedicine The book concludes with an outlook for the future of environmental protection, discussing emerging techniques in the field of pollution abatement, and the potential for bioinorganic photochemistry as a pathway to developing cheap, environmentally friendly sources of energy. Written as an authoritative guide for researchers involved in the development of bioinorganic photochemical processes, Bioinorganic Photochemistry is also accessible to scientists new to the field, and will be a key reference source for advanced courses in inorganic, and bioinorganic chemistry.
Author: Dana McGraw Dattelbaum
Publisher:
ISBN:
Category : Bipyridine
Languages : en
Pages : 644
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Author: Ulrich S. Schubert
Publisher: Springer Nature
ISBN: 3030755983
Category : Technology & Engineering
Languages : en
Pages : 462
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This book presents the synthetic methodologies as well as the properties and potential usage of various ruthenium-containing materials. Starting from the first examples of 'ruthenopolymers' reported in the 1970s to the 3D architectures now synthesized, these materials have shown their importance far beyond fundamental polymer science. As well as highlighting the remarkable properties and versatile applications, this book also addresses a key question related to the applications of such heavy-metal-containing materials from the perspective of achieving a sustainable future. This book is of interest to both materials scientists and chemists in academia and industry.
Author: Hitoshi Ishida
Publisher: BoD – Books on Demand
ISBN: 1839629169
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
Ruthenium is a precious metal not widely known to non-scientists. It is a target of much research, however. It is used in computer hard drives, the tips of fountain pens, and as a catalyst to purify car exhaust, among other uses. This book presents information and research on the properties and applications of ruthenium, including potential uses in phytochemical functions and anticancer activity.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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