Table 2. Effective thickness of the selective layers of composite membranes.

Sample	Emission intensity, a.u.	Thickness, μm
		PL spectroscopy	SEM
C-25	1500	1.07 ± 0.2	2.40 ± 0.5
C-40	3350	2.39 ± 0.2	3.30 ± 0.7
C-40-1	3100	2.17 ± 0.2	3.00 ± 0.6
C-60	6000	4.28 ± 0.2	4.30 ± 0.9
C-100	2800	2.00 ± 0.2	0.93 ± 0.2
C-120	3500	2.49 ± 0.2	0.72 ± 0.1
C-40-F	9200	6.56 ± 0.2	5.87 ± 1.2