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物質研COEセミナーの一環として、Mons-Hainaut University（ベルギー）
のBredas教授の集中セミナーを以下のように企画しました。Bredas教授は、
共役高分子の光・電子物性理論の分野で、過去１０数年間にわたり世界を
リードして来られた方です。本分野に関心のある方、本分野を勉強してみ
たい方、本分野の知識を整理しておきたい方の御参加を歓迎いたします。
4回分のセミナーのAbstractを添付します。

特に、第２～4回目に関しては、非専門の方にも分かりやすくお話しい
ただくようお願いしてあります。


Jean -Luc Bredas 教授  集中セミナー（物質研COEセミナー）

"Optical Properties and Functions of Conjugated Oligomers and
Polymers"

(共役オリゴマー・ポリマーの光物性と光機能)

４回シリーズの内、第１回目は最新の成果、第２-4回目は本分野への入門的内容
。

(1) 1月26日(月) 共役オリゴマー・ポリマーの電界発光と非線形光学応答

-
(2) 1月28日(水) 導電性・半導性共役ポリマーの電子構造

(3) 1月29日(木) 共役オリゴマー・ポリマーの非線形光学応答

(4) 1月30日(金) 発光性共役オリゴマー・ポリマーの電子構造

時間： 3：00-5：00ｐｍ（４回とも）

場所： 物質研本館１号館６階　会議室（1）、輪講室（2,3,4）


連絡先：物質研　南　信次

Tel: 54-6309,  Fax: 54-6232,  Email: minami@nimc.go.jp
               

[ABSTRACT]

(1) Electroluminescence and nonlinear optical response of conjugated
oligomers and polymers

This talk will focus on two of the currently most active research areas
in the field of conjugated oligomers and polymers. First, we describe
the use of such materials as emissive layers in light-emitting diodes;
the major theoretical issues at stake are discussed with an emphasis on
how quantum-chemical methods can be exploited to help in the design of
systems with enhanced characteristics. In the second part, we
illustrate a joint experimental and theoretical approach to the
optimization of novel conjugated chromophores for two-photon
absorption; compounds based on phenylene vinylene donor-acceptor
derivatives display values of two-photon absorption cross-sections that
are unprecedented.


(2) Electronic structure of highly conducting and semiconducting
conjugated polymers

In this lecture, we provide a basic description of the electronic
structure of conjugated organic compounds; we emphasize the influence
of the intimate connection between electronic structure and geometric
structure (so-called electron-phonon coupling) as well as the
importance of electron-electron interactions. After having illustrated
the concepts of solitons, polarons, and bipolarons, we discuss the
evolution of electronic structure upon doping in the case of
trans-polyacetylene and polypyrrole.


(3) Nonlinear optical response of conjugated oligomers and polymers

The beginning of this lecture is devoted to a guided tour of the main
quantum-chemical techniques. The aim here is not to go into the details
of the Hamiltonians; it is rather to introduce the vocabulary and the
concepts behind the most well-known methods. We then introduce the
concepts behind nonlinear optics and the way it is possible to
calculate the nonlinear optical response of conjugated organic
compounds. Several examples will be described to illustrate the major
structure polarizabilities relationships. In the second part, the
influence of medium polarity, and its impact on the degree of
ground-state polarization, is thoroughly described; we show how it is
possible to exploit it to obtain optimal second-order and third-order
effects.

   
 (4) Electronic structure of luminescent conjugated oligomers and
polymers

The exploitation of luminescence in conjugated polymers is a recent
phenomenon since it is based on the discoveries made in 1990 by Richard
Friend and his group. In this lecture, we describe the basic concepts
and the conditions that need to be fulfilled in order for luminescence
to occur. We also discuss the nature of the contact between the polymer
and the metal electrode and demonstrate that chemistry always takes
place at the interface.
                     
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 / \  |      /  \     Dr. Kikuo Harigaya
/___\ |    / /  \ \   Address: Physical Science Division,
 _|_ -+-    /____\    Electrotechnical Laboratory, Tsukuba 305, Japan
 \|/  |    / |  | \   TEL: +81-298-54-5151, FAX: +81-298-54-5375 
 -+-  |      +--+     URL: http://www.etl.go.jp/~harigaya/