Carrier density and quantum efficiency measurements in conjugated polymers: ultrafast photoinduced IRAV absorption

被引：5

作者：

Moses, D ^{[1
]}

Dogariu, A ^{[1
]}

Heeger, AJ ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA

来源：

THIN SOLID FILMS | 2000年 / 363卷 / 1-2期

关键词：

carrier density; quantum efficiency; infrared active vibrational active modes;

D O I：

10.1016/S0040-6090(99)00993-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ultrafast measurements of transient excited-state absorption in the spectral region spanning the infrared active vibrational active (IRAV) modes in the prototypical luminescent polymers, poly(phenylene vinylene), PPV, and poly[2-methoxy-5-( 2-ethyl-hexyloxy)-(phenylene-vinylene)], MEH-PPV, reveal charge carrier generation within 100 fs after photoexcitation. The relatively large photocarrier quantum efficiency in MEH-PPV, phi(0) approximate to 0.1 in zero applied electric field, implies primary photogeneration of charge carriers. Comparison of the recombination dynamics in MEH-PPV and PPV indicates that the carrier recombination rate is sensitive to the strength of the inter-chain interaction. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：68 / 71

页数：4

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