Authors
Abstract
A facile melt quenching technique was employed to prepare Eu 3+ -ions doped TRZNB glasses using commercial powders through mixing the specific weights of batches. The compositions prepared were 10TeO2 + 15RO + 5ZnO + 10Nb2O5 + 59B2O3 + Eu2O3 (where R= Mg, Ca and Sr). Under 395 nm excitation wavelength, p < /span>hotoluminescence (PL) and lifetime measurements of Eu 3+ -doped TRZNB glasses were recorded and reported. The PL spectra composed of five emission bands that are originating from the 5 D0 metastable state to 7 FJ (J = 0 - 4) lower lying states. Using the emission intensities of 5 D0→ 7 F2 and 5 D0→ 7 F4 transitions, respectively, the Judd–Ofelt (J–O) intensity parameters such as Ω2 and Ω4 were calculated by considering the magnetic dipole (MD) 5 D0→ 7 F1 transition as reference. The radiative parameters such as spontaneous emission probabilities (AR), lifetimes (τm), branching ratios (βm) for different excited states were estimated theoretically. For all the glasses, the decay profiles were fitted to the single exponential equation. The obtained intense red emission at about 616 nm assigned to the 5 D0 → 7 F2 transition suggested the potentiality of present Eu 3+ -doped TRZNB glasses as a laser host.
Keywords
)