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Judd ofelt analysis and optical properties of Eu3+ doped tellurite glasses

In this work, the structural characteristic and photoluminescence properties of Eu3+ doped B2O3-TeO2 – ZnO-Na2O glasses were investigated. These glasses were prepared by a melting method in air, combined with thermal annealing at 350 ˚ C, 450 ˚ C and 550 ˚ C for different duration times. The structural analysis results of these glasses revealed the formation of micro-crystals in the annealed host glass. The photoluminescence spectra of Eu3+ doped in these samples were observed. | Communications in Physics, Vol. 24, No. 3S1 (2014), pp. 136-142 DOI:10.15625/0868-3166/24/3S1/5465 JUDD OFELT ANALYSIS AND OPTICAL PROPERTIES OF Eu3+ DOPED TELLURITE GLASSES TRAN THI HONG Da Nang University of Education PHAN TIEN DUNG Institute of Materials Science, Vietnam Academy of Science and Technology VU XUAN QUANG Duy Tan University E-mail: dungpt63@gmail.com Received 04 April 2014 Accepted for publication 24 May 2014 Abstract. In this work, the structural characteristic and photoluminescence properties of Eu3+ doped B2 O3 -TeO2 – ZnO-Na2 O glasses were investigated. These glasses were prepared by a melting method in air, combined with thermal annealing at 350 ˚ C, 450 ˚ C and 550 ˚ C for different duration times. The structural analysis results of these glasses revealed the formation of micro-crystals in the annealed host glass. The photoluminescence spectra of Eu3+ doped in these samples were observed. The local vibration mode around Eu3+ ions was investigated by the phonon side-band (PSB) associated with 7F0 −5 D2 transition of Eu3+ . Judd-Ofelt parameters were then evaluated based on photoluminescence spectra and the luminescence intensity ratios of 5 D0 →7 FJ (J = 2, 4 and 6) to 5 D0 →7 F1 transition were predicted. The obtained results were then used to calculate Ω2 , Ω4 , Ω6 parameters based on Judd-Ofelt theory. These Ω2 , Ω4 , Ω6 parameters allow to derive radiative properties of Eu3+ ions in glass material such as transition probabilities, radiative lifetimes and peak stimulated emission cross-section for the 5 D0 →7 FJ transitions. Keywords: Optical properties, luminescence, Judd-Ofelt theory, rare earth, Tellurite glasses . I. INTRODUCTION Oxide glasses are the most stable host matrices for practical applications due to their high chemical durability and thermal stability. Among the oxide glasses, tellurite glasses have proved to be interesting host for lanthanide ions, both from a fundamental and applied point of view. It is well known that .