Optical and electrochemical characteristics of PCz0, PCz2 and PCz4.

Polymer	Abs λmaxa (nm)	Abs λonset (nm)	PLmaxb (nm)	E opt c (eV)	E HOMO (eV)	E LUMO d (eV)
PCz0	350	458	534	2.71	−5.43	−2.72
PCz2	362	396	420	3.13	−5.46	−2.33
PCz4	360–363	443	504, 578	2.80	−5.37	−2.57

^aOnly the lowest energy maxima was shown.

^bExcited at 370 nm.

^cEstimated from the onset of the absorption of the polymer in thin film as E^opt_g = 1240/λ_onset.

^dCalculated as E_LUMO = E_HOMO + E^opt_g.