Femtosecond dynamics of excitons in pi-conjugated oligomers: the role of intrachain two-exciton states in the formation of interchain species

被引：52

作者：

Klimov, VI ^{[1
]}

McBranch, DW ^{[1
]}

Barashkov, NN ^{[1
]}

Ferraris, JP ^{[1
]}

机构：

[1] UNIV TEXAS,DALLAS,TX 75230

来源：

CHEMICAL PHYSICS LETTERS | 1997年 / 277卷 / 1-3期

关键词：

D O I：

10.1016/S0009-2614(97)00923-8

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：

We report femtosecond transient absorption results for solutions and thin films of a substituted oligomer of poly(para-phenylene vinylene) performed over wide spectral and pump-intensity ranges. Solutions and films exhibit a photoinduced absorption (PA) band with dynamics matching those of the stimulated emission, demonstrating unambiguously that these features originate from intrachain singlet excitons. Thin films exhibit an additional short-wavelength PA band with pump-independent dynamics, indicating the formation of non-emissive interchain excitons. Correlations in the dynamics of the two PA features, as well as the intensity-dependence, provide strong evidence that the formation of interchain excitons is mediated by intrachain two-exciton states. (C) 1997 Elsevier Science B.V.

引用

页码：109 / 117

页数：9

共 31 条

[1] EXCITONS AND NONLINEAR OPTICAL-SPECTRA IN CONJUGATED POLYMERS [J].