Comprehensive photophysical studies of polyfluorenes containing on-chain emissive defects

被引：21

作者：

Gadermaier, C

Romaner, L

Piok, T

List, EJW

Souharce, B

Scherf, U

Cerullo, G

Lanzani, G

机构：

[1] Politecn Milan, Natl Lab Ultrafast & Ultraintense Opt Sci, I-20133 Milan, Italy

[2] Politecn Milan, Dipartimento Fis, INFM, I-20133 Milan, Italy

[3] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA

[4] Graz Univ Technol, Inst Festkorperphys, Christian Doppler Lab Adv Funct Mat, A-8010 Graz, Austria

[5] JOANNEUM RES, Inst Nanostruct Mat & Photon, A-8160 Weiz, Austria

[6] Berg Univ Wuppertal, Dept Chem, D-42097 Wuppertal, Germany

[7] Berg Univ Wuppertal, Inst Polymer Technol, D-42097 Wuppertal, Germany

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.72.045208

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a comprehensive study of the photoexcitation dynamics in fluorenone-free and fluorenone-containing polyfluorenes both on the femtosecond and the millisecond time scale. In the fluorenone-free polyfluorene a small amount of polarons are observed, which form instantaneously. Triplets are the dominant species on the ms time scale. In fluorenone-containing polyfluorenes a considerable fraction of the excitation energy is transferred to the fluorenone units, which act as energy sinks. Their lowest excited state is of charge-transfer nature and can dissociate into polarons, while no triplets are revealed.

引用

页数：7

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