Role of Nonemissive Quenchers for the Green Emission in Polyfluorene

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• 作者：Linlin Liu ; Ping Lu ; Zengqi Xie ; Huiping Wang ; Shi Tang ; Zhiming Wang ; Wu Zhang ; Yuguang Ma
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：September 13, 2007
• 年：2007
• 卷：111
• 期：36
• 页码：10639 - 10644
• 全文大小：232K
• 年卷期：v.111,no.36(September 13, 2007)
• ISSN：1520-5207

文摘

The stability of fluorene-based compounds and polymers, especially at the bridged C-9 position underphotoirradiation and thermal treatment, has claimed much attention. The emission of fluorenone formed bydegradation of the 9-site is regarded as the origin of the low emission band at 2.2-2.3 eV in polyfluorene-based conjugated materials. We have investigated the role of nonemissive quenchers such as alkyl ketones,which were also one of the products of polyfluorene degradation, for the low-energy emission in polyfluorenes.The spectral characteristics of a blend system of polyfluorene/nonemissive quencher/fluorenone are found toaccord well with the kinetics of actual polyfluorene degradation. Our results indicate that strong green emissionin degraded polyfluorene would be not caused only by fluorenone, but also by nonemissive quenchers fortheir effectively quenching bulk emission.