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Physical and Optical Analysis of Erbium Doped Magnesium Zinc Phosphate Glass

Sahar MR, Zain SK, Ishak NA, Sazali ES and Yusoff NM

Glasses with composition of (60-x)P2O5-10MgO-30ZnO-(x)Er2O3 where x = 0, 0.5, 1.0 and 1.5 mol% have successfully been prepared by melt quenching technique. The amorphous nature of the glass has been determined by using X-ray Diffractometer (XRD). It is found that all glasses are amorphous in nature. The physical properties have been determined by mean of glass density and molar volume, while the optical properties have been characterized by UV-Vis Spectroscopy (UV-Vis). The glass density is found to be in range of (2.753-2.791) g cm-3 and is increasing as the Er2O3 concentration is increased up to 0.5 mol%, but decreases as the Er2O3 concentration is further increased up to 1.5 mol%. The molar volume of the glass exhibits an opposite trend with the density. UV-Vis spectra reveal seven absorption bands from the ground state 4I15/2 to to the excited states 4F7/2, 2H11/2, 4S3/2, 4F9/2, 4I9/2, 4I11/2 and 4I13/2, centered at 486, 520, 550, 650, 792, 974 and 1536 nm, respectively. The optical energy band gap of the glass decreases as the Er2O3 concentration is increased from 0.0 mol% to 0.5 mol% but increases as the Er2O3 concentration is further increased up to 1.5 mol%. Bonding characteristic of the glass is determined via calculation of Racah parameter. All the results are discussed with respect to the Er2O3 concentration.