Synthesis, temperature sensing and white light production properties of the lithiumniobate and tungstenoxide modifed TeO2+Yb2O3+Er2O3 optical glasses

Abstract

Tellurium-based glasses doped with rare earths (RE) have been studied in recent years from various aspects due to their many important optical and physical advantages. In this study, glass materials were obtained by synthesizing Yb3+/Er3+ doped TeO2- WO3-LiNbO3 lattices with different ratios by melting method. The lattices of our glass materials were modified by increasing the Er3+ ion concentration. The up-conversion mechanism under 980 nm laser excitation, absorption properties, optical band gaps and Urbach energies in the range of 200-1100 nm, luminescence properties, thermal properties and white light parameters in the wavelength range of 400-850 nm, and the variation of rare earth ions as a function of concentration were investigated. The transitions of Er3+ ions from their ground state, which is 4I15/2, to different excited states, such as 4F3/2,5/2, 2H11/2, 4S3/2, 4F9/2, 4I11/2, were observed. At laser excitation of 400-850 nm, the emission bands 2H11/2-4I15/2, 4S3/2-4I15/2, 4F9/2-4I15/2 and 4I9/2-4I15/2 UC of Er3+ ion transitions were observed. It was found that there were small differences in the measured color parameters of the TWL glasses with increasing power. When comparing the TWL glasses as a function of concentration changes, it was found that the Er3+ concentration shifted slightly from the red to the green range with increasing power. In the optical thermometry study, measurements could be made on the TWL1, TWL2 and TWL3 glass samples. In these measurements, two green emission bands, ~527 nm and ~551 nm, were observed. It was found that the intensity at the 2H11/2→4I15/2 transition at 300 K was quite low compared to the 4S→4I transition at 573 K. On study aims to contribute to the literature on the fabrication of Er3+/Yb3+ doped TeO2-WO3 glass materials, the design of photonic devices, and the development of temperature and light sensors.