Population and decay of keto states in conjugated polymers
Population and decay of keto states in conjugated polymers
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DOI：
10.1063/1.1624825
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发表时间：
2003-11
影响因子：
4.4
通讯作者：
S. Hintschich;C. Rothe;S. Sinha;A. Monkman;P. Freitas;U. Scherf
中科院分区：
文献类型：
--
作者：
S. Hintschich;C. Rothe;S. Sinha;A. Monkman;P. Freitas;U. Scherf
利用时间分辨和稳态光致发光技术，芴/芴酮共聚物已被研究，以调查降解聚芴酮缺陷的作用。酮位点可以通过从聚芴单线态迁移来填充，从而淬灭聚芴荧光，并且通过直接光子吸收。在前一种情况下，迁移过程在淬灭效率中占主导地位的所有热和链间可变性。缺陷发射本身不存在芴酮三重态的湮灭过程，也不存在激基缔合物形成等链间过程。
Using time-resolved and steady-state photoluminescence techniques, fluorene/fluorenone copolymers have been studied to investigate the role of keto defects in degraded polyfluorene. Keto sites can be populated via migration from polyfluorene singlets, thereby quenching the polyfluorene fluorescence, and via direct photon absorption. In the former case, the migration process dominates all thermal and interchain variability in the efficiency of quenching. No annihilation process of fluorenone triplets and no interchain processes such as excimer formation participate in the defect emission itself.