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

DOI: 10.5185/amlett.2016.5870

Publication Date (Web): Jan 04, 2016

Copyright © IAAM-VBRI Press

E-mail: drdevaprasadraju@gmail.com , dillip.ngr@gmail.com

Abstract

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 ⁷F_J (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 Ω₄ were calculated by considering the magnetic dipole (MD) ⁵D₀→⁷F₁ transition as reference. The radiative parameters such as spontaneous emission probabilities (A_R), lifetimes (τ_m), branching ratios (β_m) 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.

Keywords

Tellurite glass, europium ion, J-O theory, photoluminescence, fiber amplifier.