Photophysical properties of the asymmetrically substituted spirobifluorenes spiro-DPO and spiro-MeO-DPO

被引:6
作者
Brendel, Cornelia M. [1 ,2 ]
Dias, Fernando B. [3 ]
Saragi, Tobat P. I. [1 ,2 ]
Monkman, Andy P. [3 ]
Salbeck, Josef [1 ,2 ]
机构
[1] Univ Kassel, Inst Chem, Dept Sci, D-34132 Kassel, Germany
[2] Univ Kassel, Ctr Interdisciplinary Nanostruct Sci & Technol, D-34132 Kassel, Germany
[3] Univ Durham, Dept Phys, Durham Photon Mat Inst, Durham DH1 3LE, England
来源
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2009年 / 206卷 / 12期
关键词
CHARGE-TRANSFER DYES; ELECTRON-TRANSFER; AROMATIC-AMINES; FLUORESCENCE; SPIROCONJUGATION; MOLECULES; SYSTEMS; EQUILIBRIUM; DERIVATIVES; GEOMETRY;
D O I
10.1002/pssa.200925302
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The photophysical behaviour of the oxadiazolyl (PBD) and diphenylamino (TAD) substituted spirobifluorenes 2',7'-bis-(N,N-diphenylamino)-2-(5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl)-9,9'-spirobifluoren (spiro-DPO) and 2',7'-bis-(N,N-diphenylamino)-2-(5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl)-9,9'-spirobifluoren (spiro-MeO-DPO) has been investigated by temperature-dependent steady-state absorption and luminescence spectroscopy and gated measurements. Fluorescence and phosphorescence lifetime measurements, relative quantum yields and dipole moments of the excited states have been determined. Asymmetrically substituted spirobifluorenes exhibit charge-transfer (CT) emission due to coupling (spiroconjugation) between the fluorene fragments of spirobifluorene. They show a considerable ground-state dipole moment and exist as equilibrating conformeres. Population of the CT state only occurs after absorption to the locally excited singlet state. The CT fluorescence is dominated by the emission of two equilibrating conformeres with similar dipole moments. At low temperature they planarize in both molecular halves and show strong phosphorescence that is still detectable at room temperature. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码:2715 / 2722
页数:8
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