Performance of ITO/PEDOT:PSS/[Cu(P^P)(N^N)][PF₆] : [Emim][PF₆] 4 : 1 molar ratio/Al LECs measured using a pulsed current driving (average current density 50 or 100 A m⁻², 1 kHz, 50% duty cycle, block wave). Device data for the other four complexes is summarized in Table S4. Data for previously published complexes with similar performances are added for comparison.

Complex	J avg [A m−2]	t on a [min]	Lum0b [cd m−2]	Lummaxc [cd m−2]	t 1/2 d [hours]	EQEmaxe [%]	PCEmaxf [lm W−1]	Efficacymaxg [cd A−1]	λ max  h [nm]
[Cu(POP)(4,5,6-Me3bpy)]+	50	11	82	92	0.6	0.6	0.6	1.8	571
	100	18	64	111	0.7	0.4	0.4	1.1
[Cu(xantphos)(4,5,6-Me3bpy)]+	50	27	12	190	7.1	1.4	1.8	3.8	570
	100	13	0	462	3.1	1.7	2.0	4.6
[Cu(POP)(2-Etphen)]+	50	55	76	140	8.4	1.1	1.4	2.8	582
	100	25	273	451	5.7	1.8	2.3	4.5
[Cu(xantphos)(2-Etphen)]+	50	319	0	87	98.3	1.1	0.7	1.7	580
	100	122	0	153	34.0	0.6	0.9	1.5
[Cu(POP)(6-MeObpy)]+i	50	9540	—	17	200	—	—	0.3	585
[Cu(POP)(6-EtObpy)]+i	50	60	—	63	102	—	—	1.3	585
[Cu(POP)(6-Etbpy)]+j	50	260	25	53	82	0.2	0.2	0.6	582
[Cu(xantphos)(6-CF3bpy)]+k	100	137	5	109	31	0.5	0.4	1.1	589

^aTime to reach the maximum luminance.

^bInitial luminance.

^cMaximum luminance.

^dTime to reach half of the maximum luminance.

^eMaximum external quantum efficiency.

^fMaximum power conversion efficiency.

^gMaximum current efficiency.

^hWavelength at the maximum intensity of the electroluminescence spectrum.

ⁱData from ref. 18.

^jData from ref. 24.

^kData from ref. 21.