Nanoscale Imaging of the Interface Dynamics in Polymer Blends by Femtosecond Pump‐Probe Confocal Microscopy

A polymer blend of a polyfluorene and an inert matrix is imaged with an innovative time-resolved confocal microscope. Local pump-probe signals (excited-state generation and deactivation) with sub-200-fs temporal resolution and 300-nm spatial resolution are measured. Peculiar dynamics at the interface between the segregated domains, invisible to standard optical microscopy, due to different inter-chain interactions and charge separation photophysics are detected. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.