Influence of the dendron chemical structure on the photophysical properties of bisfluorene-cored dendrimers

J. C. Ribierre, A. Ruseckas, I. D.W. Samuel, H. S. Barcena, P. L. Burn

研究成果: ジャーナルへの寄稿学術誌査読

27 被引用数 (Scopus)

抄録

A detailed study of the photophysics of a family of bisfluorene-cored dendrimers is reported. Polarized time-resolved fluorescence, singlet-singlet exciton annihilation and fluorescence quantum yield measurements were performed and used to understand how the dendron structure affects the light-emitting properties of the materials. The exciton diffusion rate is similar in all films studied. An increase in the nonradiative deactivation rate by nearly one order of magnitude is observed in films of dendrimers with stilbenyl and carbazolyl based dendrons as compared to solutions, whereas the dendrimers with biphenyl and diphenylethylenyl dendrons showed highly efficient emission (photoluminescence quantum yields of 90%) in both solution and the solid state. The results of the materials that show fluorescence quenching can be explained by the presence of quenching sites at a concentration of just a fraction of a percent of all macromolecules. A possible explanation of this quenching is hole transfer from the emissive chromophore to the dendron in a face-to-face geometry. These results are important for the design of efficient blue emitters for optoelectronic applications.

本文言語英語
論文番号204703
ジャーナルJournal of Chemical Physics
128
20
DOI
出版ステータス出版済み - 2008

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)
  • 物理化学および理論化学

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