Ultrafast optical probes of excited states in poly(1,4-phenylene vinylene) and poly(2-fluoro-1,4-phenylene vinylene)

被引：6

作者：

Eom, HS

Jeoung, SC

Kim, D

Lee, JI

Shim, HK

Kim, CM

Yoon, CS

Lim, KS

机构：

[1] KOREA ADV INST SCI & TECHNOL,DEPT CHEM,TAEJON 305701,SOUTH KOREA

[2] KOREA ADV INST SCI & TECHNOL,DEPT PHYS,TAEJON 305701,SOUTH KOREA

[3] CHUNGBUK NATL UNIV,DEPT PHYS,CHONJU 360763,SOUTH KOREA

来源：

APPLIED PHYSICS LETTERS | 1997年 / 71卷 / 05期

关键词：

D O I：

10.1063/1.120285

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the photoexcitation dynamics of poly(1,4-phenylene vinylene) (PPV) and poly(2-fluoro-1,4-phenylene vinylene) (PFPV) by using the femtosecond transient absorption spectroscopic technique. It was demonstrated that photoinduced absorption originates from nonemissive indirect polaron pairs which are more efficiently produced in PFPV than in PPV. The decay processes of polaron pairs are mainly contributed by collisional annihilation and internal conversion by phonon emission in PFPV and PPV, respectively. The differences in photoexcitation dynamics between PPV and PFPV are believed to be caused by the strong electronegativity of substituted fluorine atom. (C) 1997 American Institute of Physics.

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页码：563 / 565

页数：3

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