Effect of Dendronization on the Luminescence Behavior of Fluorene-based Polymers

Chem. J. Chinese Universities

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Effect of Dendronization on the Luminescence Behavior of Fluorene-based Polymers

WU Yi-Shi^1,2, LI Jing³, AI Xi-Cheng², FU Ya-Qin³, ZHOU Jian-Jun³, LI Lin3, BO Zhi-Shan³*, ZHANG Jian-Ping²*

1. Beijing National Laboratory for Molecular Science(BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
2. Department of Chemistry, School of Science, Renmin University of China, Beijing 100872, China;
3. State Key Laboratory of Polymer Chemistry and Physics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

Received:2007-05-13 Revised:1900-01-01 Online:2007-10-10 Published:2007-10-10
Contact: ZHANG Jian-Ping,BO Zhi-Shan

Abstract

Abstract: Steady-state absorption and fluorescence together with picosecond time-resolved photoluminescence(PL) spectroscopies were used to investigate the effect of dendronization on the luminescence character of fluorene-based polymers. For dilute tetrahydrofuran solution at 1×10^-5 mol/L, non-dendronized 9,9-dioctyl-polyfluorene(PF), the first-generation dendronized PF(PFg1), the second-generation dendronized PF(PFg2) and third-generation dendronized PF(PFg3) show identical spectra in their steady-sate absorption and fluorescence measurement, indicating that the conjugated core is not affected by dendronization. However, highly-packing PF chains appear to form aggregate in film form. Further picosecond PL studies on dendronized PFs show that the fluorene-based emission in dilute solution follows a single exponential decay, whereas those in thin film decayed in a multi-phase manner and the lifetime prolongs with the generation of dendronization. These observations are discussed in terms of dispersive transport happening between adjacent chains in film. The dispersive relaxation can be controlled by site isolation of bulky dendrons. Our results prove that dendronization is highly effective in controlling the inter-chain interactions of fluorene-based polymers.

Key words: Polyfluorene, Dendronization, Energy transfer, Time-resolved fluorescence

CLC Number:

O644.18

TrendMD:

WU Yi-Shi^1,2, LI Jing³, AI Xi-Cheng², FU Ya-Qin³, ZHOU Jian-Jun³, LI Lin3, BO Zhi-Shan³*, ZHANG Jian-Ping²*. Effect of Dendronization on the Luminescence Behavior of Fluorene-based Polymers[J]. Chem. J. Chinese Universities, doi: .

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Effect of Dendronization on the Luminescence Behavior of Fluorene-based Polymers

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