Fig. 4: OLED characteristics.
From: Towards efficient near-infrared fluorescent organic light-emitting diodes

EL spectra of the OLEDs incorporating F8BT:l-P6(THS) as the active layer collected at 15 and 24 V (i.e., the maximum radiance voltages) without and with EBL, respectively. a EQE versus current density (b), and corresponding JVR curves (inset)