Fig. 1
a Normalized absorption and photoluminescence spectra of PFO (blue solid line and dot line), F8BT (green solid line and dot line), and P3HT:F8BT (red solid line and dot line). b Transmission spectra at normal incidence of LP (red solid line), MP (green solid line), and SP (blue solid line) gratings imprinted on CdA foils and of the unpatterned CdA substrate (pink dashed line). The arrows point at the transmittance dips, corresponding to the wavelengths of 278, 350, and 416 nm, respectively. c PFO (right), F8BT (middle), and P3HT:F8BT (left) DFB structures illuminated by a UV lamp. d Diffraction pattern of a naked CdA grating when exposed to white light
