Based on the results, the complexes showing the most saturated green emission are N4 and N5. These two complexes have slightly narrower emission (FWHM decreased by 8-9 nm), the same short tPL (< 1.0 μs) and similar FPL (ca. 50%). This is consistent with the previously reported narrowing (FWHM decreased by 6 nm) of the emission spectra for complexes BG1-BG4 that have a trimethylsilyl group in the N5 position of the ppy ligands.