Triplet build in and decay of isolated polyspirobifluorene chains in dilute solution

被引：16

作者：

King, S ^{[1
]}

Rothe, C ^{[1
]}

Monkman, A ^{[1
]}

机构：

[1] Univ Durham, Dept Phys, OEM Res Grp, Durham DH1 3LE, England

来源：

JOURNAL OF CHEMICAL PHYSICS | 2004年 / 121卷 / 21期

关键词：

D O I：

10.1063/1.1811600

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：

The triplet kinetics of a conjugated polymer, polyspirobifluorene, have been studied using time resolved photoinduced absorption spectroscopy and gated emission delayed fluorescence. Working on isolated polymer chains in dilute solution, we pay particular attention to the buildup and decay of the triplet states following intersystem crossing from the excited singlet state. Confirmation of intersystem crossing as a monomolecular cold process has been made. At high excitation powers an initial fast decay of the triplet has been observed; this is attributed to intrachain triplet-triplet annihilation. From this observation we estimate the lower bound of the intersystem crossing yield as 1.2%. We also calculate the intrachain annihilation constant to be (2.9+/-0.1)x10(8) cm(3) s(-1). (C) 2004 American Institute of Physics.

引用

页码：10803 / 10808

页数：6

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