Abstract
Europium ions doped TRZNB glasses were prepared by melt quenching technique using commercial powders through mixing the specific weights of batches. The compositions prepared were 10TeO2 + 15RO + 5ZnO + 10Nb2O5 + 59B2O3 + 1Eu2O3 (where R= Mg, Ca and Sr). We report, the photoluminescence and decay analysis of Eu -doped TRZNB glasses. The luminescence spectra and decay times were measured at 395 nm excitation. The photoluminescence spectra consist of five emission bands originating from the D0 metastable state to FJ (J = 0 4) lower lying states. The phenomenological Judd–Ofelt (J–O) intensity parameters, Ω2 and Ω4 were obtained from the emission intensities of D0→ F2 and D0→ F4, respectively by taking the magnetic dipole D0→ F1 emission band intensity as reference. The radiative parameters such as spontaneous emission probabilities ( ), lifetimes (τm), branching ratios (βm) for different excited states have been predicted theoretically. The decay profiles were fitted to the single exponential equation for all the three glasses. The spectroscopic properties confirmed the potentiality of present TRZNB glasses doped with Eu ions as a laser host materials to produce an intense red luminescence at 616 nm corresponding to D0 → F2 emission level and have significant importance in the development of emission rich optical systems.
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