Fig. 2: Various aspects in the excitation of the (piq)2Ir(acac).
From: Ancillary ligand increases the efficiency of heteroleptic Ir-based triplet emitters in OLED devices

a DFT-optimized structures of the S0, T1 and T2 state of (piq)2Ir(acac). b Qualitative Walsh diagram illustrating the most important change in the ordering of the frontier orbitals in the two triplet states of Ir-complex. All bond lengths are in Å.