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Saturation, Relaxation, and Dissociation of Excited Triplet Excitons in Conjugated Polymers
Yang, Xudong,Lee, Chang-Lyoul,Westenhoff, Sebastian,Zhang, Xinping,Greenham, Neil C. WILEY-VCH Verlag 2009 ADVANCED MATERIALS Vol.21 No.8
<B>Graphic Abstract</B> <P>Femtosecond pump-probe spectroscopy is used to measure the excited state absorption dynamics in triplet excitons generated by continuous wave excitation of a conjugated polymer. Saturation of the T<SUB>1</SUB>–T<SUB>n</SUB> transition is observed, allowing a cross-section of 2.0 × 10<SUP>−16</SUP> cm<SUP>2</SUP> to be established. Relaxation to T<SUB>1</SUB> occurs with a 300 fs timescale, but 20% of T<SUB>n</SUB> states dissociate into charges. <img src='wiley_img/09359648-2009-21-8-ADMA200802597-content.gif' alt='wiley_img/09359648-2009-21-8-ADMA200802597-content'> </P>