Structural and optical investigations on Dy 3 þ doped lithium tellurofluoroborate glasses for white light applications (original) (raw)

Dy 3 þ doped lithium tellurofluoroborate glasses were prepared with the chemical composition (40-x) B 2 O 3 þ 15TeO 2 þ15Li 2 O þ15LiFþ 15NaFþ xDy 2 O 3 (BTLNxD; where x ¼0.05, 0.1, 0.25, 0.5, 1.0 and 2.0 in wt%) following conventional melt quenching technique and characterized through FTIR, optical absorption, luminescence and lifetime measurements. The vibrations of the borate and tellurite network have been identified through FTIR spectral measurements. The optical properties have been explored from the absorption and luminescence spectra. The optical band gap of direct and indirect allowed transitions was determined from Tauc's plot and the variations in the band gap energy with structural arrangements in the prepared glasses is also discussed. Judd-Ofelt theory has been used to evaluate the intensity parameters Ω 2 , Ω 4 and Ω 6 using the experimental oscillator strengths and absorption energy levels. The radiative parameters such as transition probability (A), stimulated emission cross-section ðσ E P Þ, branching ratios (β R ) and radiative lifetime (τ R ) corresponding to the 4 F 9/2 -6 H 11/2 , 6 H 13/2 and 6 H 15/2 emission transitions were calculated from the luminescence spectra. The yellow-toÀ blue (Y/B) luminescence intensity ratios and colour chromaticity coordinates of the title glasses have also been estimated to evaluate the white light emission as a function of Dy 3 þ ion concentration. These results have been used to identify the suitability of the prepared glasses for W-LED applications. The decay rates for the 4 F 9/2 level have been measured and found to deviate from exponential to non-exponential nature with the increase of Dy 3 þ ion concentration. The non-exponential decay rates have been fitted with the Inokuti-Hirayama model for S ¼ 6 which indicate that dipole-dipole mechanism is responsible for the energy transfer processes through Dy 3 þ -Dy 3 þ interaction.