Optical Properties of Malachite Green Dye Doped SiO₂ Glasses: Effect of Transition Metal (Fe-I) Used as a Codopant

Table 2

Sample code	MG conc. (×10^−5) M	Fe conc. M	^aPeak Em. wavelength (𝜆𝑝) nm	^bEffective bandwidth (Δ𝜆eff) nm	^cQY (𝜙)	^dDecay time (τ) ns	^eRadiative trans. prob. (𝐾𝑟) (×10^8) s^−1	^fNonradiative trans. prob. (𝐾nr) (×10^8) s^−1
FxM1 glass, x = 1–4
F1M1	1	0.01	620	66.93
F2M1	1	0.02	621	76.39
F3M1	1	0.03	628	85.06	0.13	3.29	0.40	2.63
F4M1	1	0.04	616	60.37
M1	1	0.00	573	133.36	0.06	3.58	0.17	2.62
FxM4 glass, x = 1–4
F1M4	50	0.01	620	82.30
F2M4	50	0.02	626	61.67
F3M4	50	0.03	624	62.96	0.05	3.59	0.13	2.66
F4M4	50	0.04	626	64.94
M4	50	0.00	585	132.69	0.07	3.01	0.21	3.09

aPeak emission wavelength (𝜆_𝑝), ^beffective band width (Δ𝜆_eff), ^cfluorescence quantum yield (𝜙), ^dradiative decay time (τ), ^eradiative rate (𝐾_𝑟), and ^fnonradiative transition probability (𝐾_nr) of emission in Fe-MG doped SiO₂ glasses.