Abstract
Femtosecond time-resolved transient grating technique was adopted to insight into the intrachain exciton diffusion of MEH-PPV in solution with different polarity. Broadband whitelight continuum was introduced as the probe to observe the transient absorption and the femtosecond time-resolved transient grating information simultaneously. The vibrational dephasing behaviors, single exciton relaxation, and population relaxation dynamics of MEH-PPV were systematically investigated. The result shows that the relaxation processes of the sample solution will be accelerated in the solvent with larger polarity.
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