Emission properties of Eu3+ ions in alkali tellurofluorophosphate glasses

The present work reports the spectroscopic properties of 1 mol% Eu2O3 in alkali tellurofluorophosphate glasses 50(NaPO3)6+10 TeO2+20 AlF3+19RF+1Eu2O3 (R=Li, Na and K) by using absorption, emission and decay measurements. The phenomenological Judd-Ofelt (J-O) intensity parameters Ω2 and Ω4 were obtained from the emission intensities of 5D0→7F2 and 5D0→7F4, respectively by taking the magnetic dipole 5D0→7F1 emission band intensity as reference. The radiative parameters such as spontaneous emission probabilities (AR), lifetimes (τ), branching ratios (β) for different excited states have been predicted theoretically. The branching ratios were also determined by the areas under the emission bands and are compared with those of the predicted values. The predicted and experimental lifetimes for the 5D0 level in alkali tellurofluorophosphate glasses were compared and discussed in detail.