Optical and electrochemical properties of the polymers.

Polymer	λ max solution (nm)	λ max film (nm)	E reduction (eV)	a E HOMO (eV)	b E LUMO (eV)	c E g (eV)
PDNDIV	322, 500	330, 509	−0.392	−6.20	−4.09	2.11
PFNDIV	325, 506	338, 524	−0.208	−6.31	−4.27	2.04

^a Eqn (2).

^b Eqn (1).

^cObtained from the Tauc plot.