Optical Characterization of Zinc Modified Bismuth Silicate Glasses

Table 1

Cut-off wavelength (), energy band gap (), and Urbach energy () of glasses of 40SiZn)Bi₂O₃ for different values of .

Parameter	= 0	= 5	= 10	= 15	= 20	= 25	= 30	= 35
(nm)	434	432	430	430	430	427	427	415
(eV)	2.79	2.88	2.91	2.92	2.94	2.95	2.96	3.00
(eV)	0.22	0.19	0.24	0.19	0.24	0.21	0.22	0.20