Comparative study of Sm³⁺ ions doped phosphate based oxide and oxy-fluoride glasses for solid state lighting applications

M.Shoaib¹，G.Rooh¹，R.Rajaramakrishna²，N.Chanthima^2,3，N.Kiwsakunkran^2,3，H.J.Kim⁴，J.Kaewkhao^2,3，S.Tuscharoen^2,3

1. Department of Physics, Abdul Wali Khan University2. Center of Excellence in Class Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University4. Department of Physics, Kyungpook National University

摘 要：The physical and luminescent properties of Sm³⁺-doped oxide and oxy-fluoride phosphate glasses were investigated. The glass samples with chemical composition of 69 P₂ O₅-10 BaO-10 ZnO-10 Gd₂ O₃-1 Sm₂ O₃ and 69 P₂ O₅-10 BaO-10 ZnO-10 GdF₃-1 Sm₂ O₃ were prepared by conventional melt quenching technique. The prepared glass samples were characterized with density, molar volume, refractive index,FTIR, UV-Vis-NIR, photo luminesce nce, radio luminescence, decay time profile and CIE diagram. The density and refractive index of the oxide glass have higher values as compared to the oxy-fluoride glass.The FTIR spectra show the reduction of O-H group in oxy-fluoride glass. The characteristic peaks of Sm³⁺are observed at 360,372,402,438,419,473,944,1077,1227,1373,1474,1529 and 1585 nm in UV-VIS-NIR spectra. These peaks are related respectively to the transitions from ground state ⁶ H_5/2 to ⁴ D_3/2, ⁶ P_7/2,6 P3/2, ⁴ I_11/2, ⁶ F_11/2, ⁶ F_9/2, ⁶ F_7/2,⁶ F_5/2,⁶ F_3/2, ⁶ H_15/2 and ⁶ F_1/2 excited states. From photoluminescence and radio-luminesce nce it is observed that the oxy-fluoride glass samples show better emission intensity than the oxide glass. The Judd-Ofelt theory（J-0 theory） was used to find J-O intensity Ω_λ（λ = 2,4 and 6）parameters and radiative properties such as transition probability, stimulated emission cross section and branching ratios for titled glasses. The trend observed in the J-O parameters is Ω₄ >Ω₂ >Ω₆. The transition probability,emission cross section and branching ratio have the highest values for the ⁴ G_5/2→⁶ H_7/2transition. The CIE coordinates of the prepared glass samples are positioned in the orange region and the CCT value is 3776.105 for oxide and oxyfluoride glass. The oxy-fluoride glass has shorter decay time as compared to the oxide glass and it is recorded to be 1.62 and 1.32 ms for oxide and oxy-fluoride respectively. According to the results obtained in this work, it is obvious that these glass samples can be good candidate materials for producing cool orange light.

关键词：