Comprehensive photophysical studies of polyfluorenes containing on-chain emissive defects

作     者：C. Gadermaier L. Romaner T. Piok E. J. W. List B. Souharce U. Scherf G. Cerullo G. Lanzani 

作者机构：National Laboratory of Ultrafast and Ultraintense Optical Science and INFM Dip. di Fisica Politecnico di Milano P.zza L. da Vinci 32 20133 Milano Italy School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta Georgia 30332-0400 USA Christian-Doppler Laboratory Advanced Functional Materials Institute of Festkörperphysik Techn. University Graz Petersgasse 16 8010 Graz and Inst. of Nanostructured Materials and Photonics JOANNEUM RESEARCH Franz-Pichler-Str. 30 8160 Weiz Austria Department of Chemistry and Institute of Polymer Technology Wuppertal University Gauss-Str. 20 D-42097 Wuppertal Germany 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：2005年第72卷第4期

页      面：045208-045208页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

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.