Electronic Excitations in Organic Based Nanostructures

Electronic Excitations in Organic Based Nanostructures, 1st Edition

Electronic Excitations in Organic Based Nanostructures, 1st Edition,G. Bassani,V. Agranovich,ISBN9780125330312

Bassani   &   Agranovich   

Academic Press




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Key Features

* hybrid Frenkel-Wannier-Mott excitons
* microcavities with crystalline and disordered organics
* electronic excitation at donor-acceptor interfaces
* cold photoconductivity at donor-acceptor interface
* cummulative photovoltage
* Feorster transfer energy in microcavity
* New concepts for LEDs


The first book devoted to a systematic consideration of electronic excitations and electronic energy transfer in organic
crystalline multilayers and organics based nanostructures(quantum wells, quantum wires,
quantum dots, microcavities). The ingenious combination of organic with inorganic materials in one and the
same hybrid structure is shown to give qualitatively new opto-electronic phenomena, potentially important for
applications in nonlinear optics, light emitting devices, photovoltaic cells, lasers and so on. The book will be useful not only
for physicists but also for chemists and biologists.To help the nonspecialist reader,
three Chapters which contain a tutorial and updated introduction to the physics of electronic excitations in organic
and inorganic solids have been included.


Physicists, chemists and biologists - researchers, graduates and undergraduates.To help the nonspecialist reader, three Chapters which contain a tutorial and updated introduction to the physics of electronic excitations in organic and inorganic solids have been included.

G. Bassani

After receiving his doctorate in physics from the University of Pavia in 1952, Franco Bassani had a brilliant career in various institutions in the United States and in Italy. As a research associate in the Department of Physics of the University of Illinois, then led by Professor Frederick Seitz, and later at Argonne National Laboratory, he developed a powerful method for band structure studies in semiconductors. As a professor of theoretical physics at the Universities of Messina, Pisa, and Rome and, currently, at Scuola Normale Superiore, he has established an internationally recognized school of condensed matter theory focussed on the optical and electronic properties of semiconductors and insulators, thus providing the scientific basis for their applications in optoelectronics. In his distinguished career, Professor Bassani has received many honors including honorary degrees from several European universities. He is a member of the prestigious "Academia Nazionale dei Lincei," and in 1979 was awarded the "Somaini" Prize by the Italian Physical Society. In 1994 he received the Honorary Degree of Doctor of Science from Purdue University for his innovative pioneering researches on the band structure and optical properties of semiconductors and for his intellectual leadership in condensed matter physics.

Affiliations and Expertise

Scuola Normale Superiore, Pisa, Italy

V. Agranovich

Affiliations and Expertise

Russian Academy of Sciences, Moscow, Russia

View additional works by V. M. Agranovich

Electronic Excitations in Organic Based Nanostructures, 1st Edition

The possibility of growing tailor-made systems incorporating in different ways organic crystalline materials , eventually joined to inorganic heterostructures, has opened a new field of research in fundamental and applied physics. This is the first book devoted to a systematic study of electronic excitations and energy transfers in such materials. The book can be useful to physicists interested in material science and to chemists and biologists as well.

After three initial Chapters which contain a tutorial and updated introduction to the physics of electronic excitations in organic and inorganic solids, multilayer organic structures and organics based heterostructures are considered.

In the first class of materials the role of quasi two-dimensional effects at surfaces and interfaces is described. "The Fermi Resonance Interface modes", and the related bistability and multistability in the energy transmission through the interface are investigated, as well as Frenkel excitons and charge-transfer excitons in organic multilayers and at donor-acceptor interfaces. Phase transition to the conducting state (cold photoconductivity) and exciton-polaritons in organic microcavities with crystalline and disordered organics are also discussed..

In the materials which result from the combination of organic and inorganic matter in a single hybrid nanostructure (quantum wells, quantum wires, quantum dots and microcavities) new peculiar excitations which share properties of Frenkel excitons(large oscillator strength) and of Wannier excitons (large radius) are shown to arise for strong coupling and to give rise to large enhansments in the nonlinear optical effects . Such hybrid excitons are also discussed in the case when the organic-inorganic layers are inbedded in a microcavity and hybridization is produced by the cavity electromagnetic field instead of Coulombic dipole-dipole interaction.

The performance of opto-electronic devices in planar microcavity structures are described in the book, in connection with experiments which demonstraite a giant Rabi splitting in organic microcavities and polariton relaxation strongly affecting absorption , transmission and luminescence.

In the case of weak resonance coupling between Wannier excitons in inorganic nanostructure and Frenkel excitons in the organic overlayer a fast energy transfer from the first to the second is shown to occur, with subsequent strong luminescence. As a consequence new concepts for light emitting devices can be developed and are described in the book. The energy transfer is also considered when the organic and inorganic nanostructures are imbedded in one microcavity or in two interacting microcavities, in which case the energy transfer between the donor and the acceptor nanostructures is greatly enhanced by the cavity electromagnetic interaction. The role of the acceptor absorber and of different dissipative processes is analyzed in detail, in connection with recent experiments.

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