Fig. 3: Calculated squared transition dipole moment spectra for selected donor–acceptor pairs.

a, b The Ir(ppy)3 and fac-Ir(pmp)3 donor spectrum, respectively, together with the Ir(ppy)3, Ir(BT)2(acac), Ir(dpo)2acac, Ir(MDQ)2acac, Ir(BTP)2(acac), and NIr acceptor spectra. Each panel also gives the Förster radius for the exciton transfer in the corresponding donor–acceptor system. For Ir(BT)2(acac) and Ir(BTP)2(acac) the peaks with strong S1 character are indicated.