Direct exciton quenching in single molecules of MEH-PPV at 77 K

被引:46
作者
Mirzov, O
Cichos, F
von Borczyskowski, C
Scheblykin, IG
机构
[1] Lund Univ, Dept Chem Phys, S-22100 Lund, Sweden
[2] Tech Univ Chemnitz, D-0910 Chemnitz, Germany
关键词
D O I
10.1016/j.cplett.2004.01.066
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
Fluorescence blinking behaviour was observed for single molecules of the conjugated polymer poly[2-methoxy,5-(2'-ethylhexyloxy)-p-phenylene-vinylene] (MEH-PPV) at 77 and 300 K. No strict qualitative dependence on temperature was observed, despite of the expected suppression of exciton migration at the low temperature. We assume MEH-PPV molecules to form dense nanoparticles with a characteristic size of about 10 nm at the largest. In such small nanoparticles exciton can be efficiently quenched by a photogenerated quencher due to Forster transfer just after a few hops over the polymer nanoparticle. Thus, long-distance exciton migration is not necessary to have strong fluorescence intensity fluctuations. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:286 / 290
页数:5
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