All complexes showed biexponential emission decay in the mCBP doped films. The short lifetime component varied from 0.51 to 1.55 μs, while the longer component varied from 1.40 to 7.31 μs. The contribution of the shorter lifetime component ranges from 22 to 79% with no trend discernible in terms of the relative contributions. The weighted average lifetimes range from 1.3 to 5.6 μs. The FPL ranged from 50-60% for complexes N4, N5, C4N4 and C4N5, which are very similar to that of Irpic (53%). These are slightly lower than the doped film ΦPL values observed for FIrpic (78% in CBP), but consistent with those observed for a series of Firpic derivates in film (40-84%). In contrast, C3, C4, C3N4 and C3N5 showed lower FPL values between 19 and 43% (Table ).