eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences july 2024 36 5 32 38 http://dx.doi.org/10.22147/jusps-B/360501 1542 article Enhanced Green Light Upconversion in Terbium–Ytterbium ions Co-doped Zinc–Tellurite Glasses VIKASH KUMAR SINGH 1 M.Y. LONE 1 RAJIV KUMAR 2 GHIZAL F. ANSARI 1 Department of Physics, Madhyanchal Professional University, Bhopal - 462044 (INDIA) Department of Physics, OFK Govt. College Khamaria, Jabalpur - 482005 (INDIA) <p style="text-align:justify">Transparent zinc-tellurite glasses co-doped with Terbium ion (Tb<sup>3+</sup>) and Ytterbium ion (Yb<sup>3+</sup>) were successfully created using the melt-quench method in an air environment. Systematic investigations were conducted using X-ray diffraction, differential scanning calorimeter, UV-Visible-IR, and upconversion spectra to examine the structural, thermal, and optical properties. The absorption peaks from the Tb<sup>3+</sup> transitions are located at 486 nm (<sup>7</sup>F<sub>6</sub> / <sup>5</sup>D<sub>4</sub> ) in the Tb<sup>3+</sup> single doped glass. The overlapping absorption bands are believed to be the result of the transition from<sup> 5</sup>D<sub>0</sub> to <sup>3</sup>H<sub>7</sub> excited-state levels were observed. Under 978 nm laser stimulation, a zinc tellurite glass sample containing Tb<sup>3+</sup> and Yb<sup>3+</sup> ions showed strong, typical Tb<sup>3+</sup> emissions (<sup>5</sup>D<sub>4</sub> - <sup>7</sup>F<sub>3-6</sub> and <sup>5</sup>D<sub>3</sub> - <sup>7</sup>F<sub>4-6</sub>). The upconversion&rsquo;s laser power dependence demonstrated that the two-photon process was in charge of the green emission.</p> https://ultraphysicalsciences.org/paper/1542/ Upconversion tellurite glasses absorption spectra