Photophysics of charge transfer in a polyfluorene/violanthrone blend

被引：23

作者：

Cabanillas-Gonzalez, J ^{[1
]}

Virgili, T

Lanzani, G

Yeates, S

Ariu, M

Nelson, J

Bradley, DDC

机构：

[1] Politecn Milan, ULTRAS,INFM, IFN,CNR, Dipartimento Fis, I-20133 Milan, Italy

[2] Avecia Ltd, Electron Mat Business, Manchester M9 8ZS, Lancs, England

[3] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Expt Solid State Grp, London SW7 2BZ, England

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.71.014211

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a study of the photophysical and photovoltaic properties of blends of violanthrone in poly[9,9-bis(2-ethylhexyl)-fluorene-2,7-diyl] (PF2/6). Photoluminescence quenching and photocurrent measurements show moderate efficiencies for charge generation, characteristic of such polymer/dye blends. Pump-probe measurements on blend films suggest that while similar to47% of the total exciton population dissociates within 4 ps of photoexcitation, only similar to32% subsequently results in the formation of dye anions. We attribute the discrepancy to the likely formation of complex species with long lifetimes, such as stabilized interface charge pairs or exciplexes. This conclusion is supported by the appearance of a long lifetime component of 2.4 ns in the dynamics of the photoinduced absorption signal associated to polarons in photoinduced absorption bands centered at 560 nm.

引用

页数：8

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