Fig. 4. The performance of red and DR-NIR OLEDs made by Ir(piq)2(acac), CNIr and TCNIr, respectively: (a) EL spectra and (b) EQE vs. luminance curves for these devices; (c) the EQE summary of Ir(iii)-based DR-NIR-emitting OLEDs with the emission peaks from 680 to 780 nm.