Population and decay of keto states in conjugated polymers
- 21 November 2003
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 119 (22) , 12017-12022
- https://doi.org/10.1063/1.1624825
Abstract
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.Keywords
This publication has 23 references indexed in Scilit:
- The Effect of Keto Defect Sites on the Emission Properties of Polyfluorene-Type MaterialsAdvanced Materials, 2002
- Improving the Performance of Polyfluorene-Based Organic Light-Emitting Diodes via End-cappingAdvanced Materials, 2001
- Polyfluorenes with Polyphenylene Dendron Side Chains: Toward Non-Aggregating, Light-Emitting PolymersJournal of the American Chemical Society, 2001
- Film morphology and photophysics of polyfluorenePhysical Review B, 2000
- Delayed luminescence of the ladder-type methyl-poly(para-phenylene)Chemical Physics, 1999
- Interplay of Physical Structure and Photophysics for a Liquid Crystalline PolyfluoreneMacromolecules, 1999
- Blue Polarized Electroluminescence from a Liquid Crystalline PolyfluoreneAdvanced Materials, 1999
- Electrical and Photoinduced Degradation of Polyfluorene Based Films and Light-Emitting DevicesMacromolecules, 1998
- Solvent and concentration effects on the steady state fluorescence of fluorenoneJournal of Photochemistry and Photobiology A: Chemistry, 1996
- Aggregate fluorescence in conjugated polymersChemical Physics Letters, 1995