Table 2.

Photoluminescence lifetime (${\tau }_1,{\tau }_2,{\tau }_{3}and{\tau }_{av})$ of the FWCDs, with and without Fe³⁺.

	FWCDs	Fe50	Fe100	Fe250
${\tau }_1$(ns)	11.55	11.99	11.93	11.75
${\tau }_2$(ns)	4.19	4.34	4.20	4.26
${\tau }_3$(ns)	1.16	1.20	1.16	1.18
${\tau }_{av}$(ns)	2.79	3.14	3.24	3.17