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Judd ofelt analysis and optical properties of rare earth doped tellurite glasses

In this work, the structural characteristic and photoluminescence properties were investigated in Eu3+ ions-doped B2O3-TeO2 –ZnO-Na2O glasses. These glasses were prepared by the melting method in air, after that thermal annealed 350˚C, 450˚C and 550˚C for different times. | Communications in Physics, Vol. 23, No. 4 (2013), pp. 377-384 JUDD OFELT ANALYSIS AND OPTICAL PROPERTIES OF RARE EARTH DOPED TELLURITE GLASSES TRAN THI HONG Da Nang University of Education, 459 Ton Duc Thang Road, Da Nang, Vietnam PHAN TIEN DUNG Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam VU XUAN QUANG Duy Tan University, K7/25 Quang Trung Road, Da Nang, Vietnam Received 19 November 2013 Accepted for publication 31 December 2013 Abstract. In this work, the structural characteristic and photoluminescence properties were investigated in Eu3+ ions-doped B2 O3 -TeO2 –ZnO-Na2 O glasses. These glasses were prepared by the melting method in air, after that thermal annealed 350˚C, 450˚C and 550˚C for different times. The analysis results of structure on these glasses showed the formation of micro-crystals in host glass after thermal annealed process. The photoluminescence spectra of Eu3+ ions in these samples were observed. The local vibration mode around Eu3+ ions was investigated by the phonon side band associated with 7 F0 - 5 D2 transition of Eu3+ . Judd-Ofelt parameters have been evaluated from photoluminescence spectra and were to predict the luminescence intensity ratios of 5 D0 →7 FJ (J=2, 4 and 6) to 5 D0 →7 F1 transition. The obtained results have been used for calculating Ω2 , Ω4 , Ω6 parameters by using 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. 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 an applied point of view. It is well-known, the non-radiative