The electrical characterization of the devices consists mainly in the measurement of the current flowing through the diode (whether it is organic light emitting diode – OLED or organic photovoltaic – OPV) as a function of the applied voltage, I – V. The voltage versus current output characteristics of the devices are measured using a Keithley 2400 source-measure unit and recorded via OLED CHAR.vi and OPV CHAR.vi software written in Labview 7.1 for OLEDs and OPVs, respectively. Luminance and electroluminescence (EL) spectra of OLEDs are recorded with an Ocean Optics USB 2000 fiber optic spectrophotometer (assuming a Lambertian emission profile). The illumination source of OPVs is a Xe lamp equipped with an AM 1.5G filter simulating solar light conditions with an intensity of 100 mW/cm² (LCS-100 solar simulator)