Enhanced nonlinear optical properties and thermal stability of donor-acceptor substituted oligothiophenes

被引：45

作者：

Steybe, F

Effenberger, F

Beckmann, S

Kramer, P

Glania, C

Wortmann, R

机构：

[1] UNIV MAINZ,INST PHYS CHEM,D-55099 MAINZ,GERMANY

[2] UNIV STUTTGART,INST ORGAN CHEM,D-70569 STUTTGART,GERMANY

[3] BASF AG,D-67056 LUDWIGSHAFEN,GERMANY

来源：

CHEMICAL PHYSICS | 1997年 / 219卷 / 2-3期

关键词：

D O I：

10.1016/S0301-0104(97)00103-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Linear and nonlinear optical properties of a series of novel donor-acceptor substituted alpha-oligothiophenes were investigated by means of electrooptical absorption measurements (EOAM) and electric field induced second harmonic generation (EFISH). The second-order polarizabilities beta(-2 omega; omega, omega) were related to dipole changes Delta mu(ag) and transition dipoles mu(ag) associated with low-lying charge-transfer (CT) excitations by using the perturbational two-level approximation, Systematic variation of the donor and acceptor groups led to compounds with exceptional nonlinearity and thermal stability. Too strong donor/acceptor pairs, however, yielded structures in the charge-resonance (CR) limit with small or vanishing Delta mu(ag) and beta. (C) 1997 Elsevier Science B.V.

引用

页码：317 / 331

页数：15

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