Table 1. Exciplex Photophysical Properties at Different Dilutions in UGH-3 or DPEPO.

dilution	vol %	average D–A distance (Å)	τDF (μs)	PL onset (eV)	PL fwhm (eV)	PLQY air/N2
neat exciplex	0	6.0	2.4 ± 0.1	2.67	0.51	0.45/0.58
UGH-3	10	6.3	2.2 ± 0.1	2.68	0.52	0.50/0.63
UGH-3	30	6.8	2.8 ± 0.1	2.70	0.51	0.51/0.65
UGH-3	50	7.6	3.1 ± 0.1	2.79	0.58	0.67/0.80
UGH-3	70	9.0	3.1 ± 0.2	2.83	0.58	0.49/0.70
UGH-3	90	13		2.85	0.48	0.35/0.35
DPEPO	10	6.3	2.4 ± 0.1	2.67		0.52/0.68
DPEPO	30	6.8	2.5 ± 0.1	2.67		0.34/0.45
DPEPO	50	7.6	2.3 ± 0.1	2.70		0.23/0.28
DPEPO	70	9.0	2.9 ± 0.1	2.73		0.28/0.38
DPEPO	90	13	2.8 ± 0.1	2.80		0.06/0.07