Study of erbium-doped boric acid glass system

Abstract

The spectroscopic properties of (H3BO3-Pb2O3-ZnO) boric acid glasses (BAG) containing different concentrations of Er2O3 doped were prepared in the temperature range of 1050 °C-1150 °C. A series with Erbium concentration 0.50 % is studied in this work. UV–VIS and Raman spectra were recorded for 200 nm to 800 nm and 0 cm−1 to 4000 cm−1 respectively. The X-ray diffraction (XRD) pattern confirmed the glassy nature of the synthesized samples. Laser Raman spectra have been recorded using 532 nm and 785 nm wavelength excitation to study the vibrational nature of the glass structure. Laser raman spectra with excitation 532 nm laser shows seven peaks around 64.193, 295.72, 917.65, 1210.10, 1335.40, 1631.30, and 1990.50 cm−1 and with excitation 785 nm laser shows four paeks around 88.039, 479.65, 754.95, and 1332.10 cm−1. Erbium ion-doped boric acid glasses show BO3 and BO4 structural units in FTIR studies. The Tauc’s Plot calculations show the optical band gap of the synthesized sample to be nearly 3.07 eV. By using optical band gap value the refractive index of the synthesized sample is calculated which is nearly equal to 2.38. The optical absorption spectra provide useful information about the crystal field strength(10Dq) and the inter-electronic interaction or the Racah parameters B and C. The parameter B calculates the nephelauxetic function, h of the ligand.