where kISC is the nonradiative intersystem crossing rate, and P is the phosphorescence quantum yield. Brühlmann et al. obtained the phosphorescence lifetime by measuring the spectrally integrated T1 decay following the S0→S1 excitation. This decay contains information on radiative and nonradiative components, and they report both kP and k0. Similarly, Hirata and Lim also reported radiative and nonradiative decay rates . In turn, Biron and Longin and Inoue and Ebara fitted the phosphorescence intensity signal. However, they did not explicitly consider nonradiative components. Thus, their reported rate should correspond to k0. From the theory perspective, rates computed with either Eq. ( ) or (3) must be exclusively compared with kP.