Effect of Annealing on Optical Properties of ZnO⋅LiF⋅B₂O₃ Glasses

Table 1

Cutoff wavelength (𝜆_cutoff), optical band gap energy 𝐸_𝑔, and Urbach energy (𝐸_𝑈) for the samples with 𝑥=0, 5, 10, 15, and 20 in the compositions xZnO·(40−𝑥)LiF·60 B₂O₃.

Annealing temperature (°C)	𝑥 (mol%)	𝜆cutoff (nm)	𝐸𝑔 (eV)	𝐵 (cm eV)^−1	𝐸𝑈 (eV)
300	0	375	2.85	1.3234	0.9325
	5	371	3.13	3.0002	0.4877
	10	350	3.42	8.4344	0.3443
	15	356	3.35	12.1620	0.3249
	20	360	3.10	1.7609	0.6249
350	0	366	2.80	1.5250	1.2799
	5	391	2.95	1.0723	0.8693
	10	356	3.23	1.6381	0.6494
	15	372	2.91	1.1500	1.0000
	20	375	2.90	0.7557	1.0724
400	0	356	3.00	1.7609	1.1504
	5	344	3.25	3.5370	0.7002
	10	350	3.30	3.0001	0.5095
	15	357	3.19	0.8700	0.8391
	20	426	2.45	0.2600	1.7319