Table 1. Summary of Key Photophysical Properties of Complexes Ir(dppm)₂(acac),²¹Ir₂(dppm)₃(acac)₂ and Ir₃(dppm)₄(acac)₃ Measured as Dilute Toluene Solutions (c ≈ 10^–5 M) and Doped Polystyrene (PS) Films (c ≪ 1 wt %)^a.

	Ir(dppm)2(acac)	Ir2(dppm)3(acac)2	Ir3(dppm)4(acac)3
absorption λmax/nm (ε/M–1cm–1)	530 (6600), 500 (5900), 426 (11800), 379 (16900), 310 (47100)	576 (10800), 536 (16100), 474 (15500), 427 (22400), 373 (34500), 321 (71600)	580 (21000), 538 (23700), 475 (24260), 425 (31300), 372 (50400), 321 (89500)
photoluminescence in toluene at 300 K
λmax/nm	570	598, 640	600, 645
ΦPL/%	80	65	60
τ/μs	0.73	0.27	0.20
τr = τ/ΦPL /μs	0.91	0.42	0.33
kr/106 s–1	1.10	2.41	3.00
knr/106 s–1	0.27	1.30	2.00
photoluminescence in toluene at 77 K
λmax/nm	563	590, 638	593, 644
ΦPL/%	100	100	90
τ/μs	10.90	2.40	1.40
τr = τ/ΦPL/μs	10.90	2.40	1.56
kr/106 s–1	0.09	0.42	0.64
knr/106 s–1	<0.003b	<0.010b	0.064
photoluminescence in PS film at 300 K
λmax/nm	568	600, 642	602, 642
ΦPL/%	90	80	70
τ/μs	0.66	0.29	0.21
τr = τ/ΦPL/μs	0.73	0.36	0.30
kr/106 s–1	1.4	2.8	3.3
knr/106 s–1	0.15	0.69	1.4

^aThe absorption spectrum was measured in toluene under ambient conditions. The ambient temperature (300 K) emission decay time and quantum yield values were measured for degassed toluene solution and PS films under nitrogen. The radiative decay rates are calculated as k_r = Φ_PL/τ; the non-radiative decay rates are calculated as k_nr = (1−Φ_PL)/τ; the radiative decay times are calculated as τ_r = τ/Φ_PL = 1/k_r.

^bThese values are estimated assuming 3% error in the emission quantum yield value, e.g., assuming Φ_PL = 0.97 (97%).