Unlike BA, for which experimental data is abundant, for the BA derivatives, the only available information about phosphorescence lifetime is for MoBA. MoBA in vapor has a lifetime of ~1 ms or less , near what we obtained with the vertical approximation for the 3 n* minimum and NEA for both minima. In a 77-K glass, the measured phosphorescence lifetime of MoBA is much longer, about 120 ms . This value qualitatively matches the vertical phosphorescence lifetime for 3 *, indicating that the glass quenches the 3 n* emission.