Correlation of Intramolecular Excimer Emission with Lamellar Layer Distance in Liquid‐Crystalline Polymers: Verification by the Film‐Swelling Method

Swollen up: Poly(diphenylacetylene) derivatives with different alkyl groups show intramolecular excimer emission that arises from the phenyl–phenyl stack structure in the side chains. The excimer emission is intrinsically correlated with lamellar layer distance. Film-swelling experiments verify that the excimer emission can be modulated by changing the lamella layer distance (see picture).