SPECTROSCOPY PROPERTIES IN Dy3+ ION DOPED ZINC BARIUM TELLURITE OXYFLUORIDE GLASSES FOR WHITE LED APPLICATIONS
Keywords:
Tellurite glasses, Dy3+, optical properties, LuminescenceAbstract
Dysprosium (Dy3+) ion doped tellurite glasses were prepared by the normal melt quenching technique with the compositions (55-x)TeO2-10ZnF2-35BaO-xDy2O3 (where x = 0.00, 0.05, 0.10, 0.50 1.00, and 1.50 mol%) to study the physical and optical properties. All the absorption bands have been occurred from the ground state 6H15/2 to various excited states 6F3/2, 6F5/2, 6F7/2, 6F9/2, 6F11/2, and 6H11/2 at wavelengths 750, 804, 901, 1,095, 1,277, and 1,681 nm respectively. The J-O intensity parameters, assess from the absorption spectra and emission spectra to lead to the calculation of values transition probability (AR), branching and ratio (βR) for the prominent emission transitions of Dy3+ ion in tellurite glasses. The highest intensity of the emission spectra of Dy3+ ion doped tellurite glasses is at 575 nm that corresponding to the 4F9/2→6H13/2 transitions and also indicate that the intense white region appear when excited at 452 nm. Luminescence results represent that these glasses can be further modified for white LED and display device. The lifetime values, corresponding to the 4F9/2 excited state, inversely vary with the increase of Dy3+ ion concentration. These obtained results were discussed and reported in the present works.
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