Table.

Basic photophysical properties of ICG and its IR analogs

	IR dye	Absorption λmax, nm	Emission λmax, nm	Extinction coefficient, ε (× 105 M−1cm−1)	Quantum yield of singlet oxygen, %*	Quantum yield of fluorescence, %	Reference
1	ICG	785	822	2.04	0.8	7.8M	[82]
2	IR780	780	798–823**	2.65	12.7	0.07–0.17%**	[83, 84]
3	IR783	783	804	1.17	3	4	[82]
4	IR800	774	794	2.40	N/D	9	[85]
5	IR808	783M	816	3.00	N/D	5.9	[86, 87]
6	IR775	775M	792	2.37	N/D	7	[88]
7	IR820	820	850	2.02	2	4.4	[82]
8	IR825	825M	–	1.14	N/D	< 0.1M	[89]
9	DiR	747M	774M	2.70	N/D	28	[90]
10	CySCOOH	820	840	N/D	N/D	N/D	[91]
11	Cypate	785	822	2.16	2	6.5	[92]

^*Relative to Rose Bengali [82];

^**depending on the solvent;

N/D – no data;

M – in methanol.