Ultrafast depolarization of the fluorescence in a conjugated polymer -: art. no. 115214

被引：100

作者：

Ruseckas, A ^{[1
]}

Wood, P

Samuel, IDW

Webster, GR

Mitchell, WJ

Burn, PL

Sundström, V

机构：

[1] Univ St Andrews, Sch Phys & Astron, Ultrafast Photon Collaborat & Organ Semicond Ctr, St Andrews KY16 9SS, Fife, Scotland

[2] Univ Oxford, Dept Chem, Oxford OX1 3TA, England

[3] Lund Univ, Dept Chem Phys, S-22100 Lund, Sweden

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.72.115214

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of the extent of pi electron conjugation on the primary photophysics in semiconducting polymers is reported. A rapid depolarization of photoluminescence and transient absorption, which indicates a reorientation of the transition dipole moment by similar to 30 degrees on a sub-100 fs time scale, is observed in the fully conjugated polymer poly[2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV). In contrast, partially conjugated polymers exhibit a much slower depolarization. The results reveal rapid changes of exciton delocalization in the fully conjugated MEH-PPV driven by structural relaxation.

引用

页数：5

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