Photoluminescence studies of Eu3+ ions doped calcium zinc niobium borotellurite glasses
1Department of Physics, Sri Venkateswara University, Tirupati 517502, India
2Department of Instrumentation, Sri Venkateswara University, Tirupati 517502, India
3School of Mechanical Engineering and Technology, Yeungnam University, Gyeongsan, 712749, South Korea
4Post Graduate Teacher in Physics, AP Model School, Yerravaripalem 517194, India
5Department of Future Studies, Sri Venkateswara University, Tirupati, 517 502, India
Adv. Mater. Lett., 2016, 7 (2), pp 170-174
Publication Date (Web): Jan 04, 2016
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A facile melt quenching technique was employed to prepare Eu3+-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, photoluminescence (PL) and lifetime measurements of Eu3+-doped TRZNB glasses were recorded and reported. The PL spectra composed of five emission bands that are originating from the 5D0 metastable state to 7FJ (J = 0 - 4) lower lying states. Using the emission intensities of 5D0→7F2 and 5D0→7F4 transitions, respectively, the Judd–Ofelt (J–O) intensity parameters such as â„¦2 and â„¦4 were calculated by considering the magnetic dipole (MD) 5D0→7F1 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 5D0 → 7F2 transition suggested the potentiality of present Eu3+ -doped TRZNB glasses as a laser host.
Tellurite glass, europium ion, J-O theory, photoluminescence, fiber amplifier.