Photoluminescence data for complexes 1–4 and co-complex 1–4·5.

System	λ exc a (nm)	λ em a (nm)	Φ PL b	τ c (μs)	k r d (×105 s−1)	k nr e (×105 s−1)
1	264, 378	467, 493	86.7	2.3	3.8	0.6
1·5 (1 : 1)	280, 378	462, 489	82.2	2.1	0.4	0.9
2	296, 320	545, 588	8.7	0.0019	448.5	4706.2
2·5 (1 : 1)	298, 325	538, 584	15.6	0.0036	430.9	2331.5
2·5 (1 : 1.3)	298, 326	538, 584	33.2	0.0034	985.2	1982.2
3	298, 332	570, 610	23.4	1.7	1.4	4.5
3·5 (1 : 1)	297, 340	569, 607	43.3	4.3	1.0	1.3
4	296, 338	594, 640	36.1	3.6	1.0	1.8
4·5 (1 : 1)	308, 391	593, 635	41.4	3.6	1.2	1.6

^aAll data was collected in CHCl₃ and degassed for 1 min (argon) at 298 K.

^bPLQYs for Ir(iii) complexes 1–4, determined using the relative method. Further details of standard in the ESI S1 and S5.

^cDecay lifetimes using TCSPC excited at 365 nm and their corresponding chi-squared values for Ir(iii) complexes 1–4, in CHCl₃ degassed for 20 min (Ar) at 298 K. Complexes 1, 2, 3, and 4 decay biexponentially.

^dThe radiative (k_r) rate constant was calculated as k_r = Φ_PL/τ_PL.

^eThe nonradiative (k_nr) rate constant was calculated as k_nr = (1 − Φ_PL)/τ_PL.