Fig. 4. (a) Absorption spectra of C3OPV (
), C3PBI (
), and a 1 : 1 mixture of C3OPV and C3PBI (
) in the film state. (b) Emission spectra of C3OPV (
), λex = 375 nm, C3PBI (
), λex = 500 nm, and a 1 : 1 mixture of C3OPV and C3PBI (
), λex = 375 nm and (
) λex = 500 nm, in the film state.
