Table 1.

Characteristics of mGeos, mEos2, and Dronpa

	Abs. (nm)	Emi. (nm)	QY	ϵ-max (M-1 cm-1)	pKa	Relaxation half-time (min)
Dronpa*	503	522	0.68	125,000	5	840
mGeos-F	504	515	0.85	53,135	5	205
mGeos-M	503	514	0.85	51,609	4.5-5	169
mGeos-C	505	516	0.81	76,967	6	223
mGeos-S	501	512	0.76	64,602	5-5.5	272
mGeos-E	501	513	0.75	69,630	6-6.5	848
mGeos-L	501	513	0.72	53,448	5-5.5	398
mEos2 (Green)*	506	519	0.84	56,000	5.6	--

^*Literature values in ref. (14, 19) and (32). The quantum yield (QY) and extinction coefficient (ϵ) of mGeos-X were measured in PBS (pH = 7.4) for their on-states.