Temperature-dependent PL is an acknowledged technique to demonstrate the effect of
intramolecular motion on the light emission process. PACV 20c and its hyperbranched counterpart
55 are conjugated polymers with double-bonded backbones prepared from click polymerization
(Scheme 4A) [Error! Bookmark not defined.]. The emission spectra of 20c and 55 in the frozen
state are much intensified than those at room temperature (Figures 2A and 2B). Such enhancement
is closely related to the limited collision interaction with solvent molecules and the restriction of
intramolecular motions.