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Solid State Synthesis and Judd - Ofelt Parameter of Europium Doped Barium Magnesium Silicate Phosphors

Bhuneshwar Verma1*, R. N. Baghel2 and G. Yadu3

1Department of Physics, Govt. Nagarjuna PG College of Science, Raipur 492010 INDIA. 2School of Studies in Physics, Pt. Ravishankar Shukla University, Raipur 492010 INDIA. 3Department of Physics, Govt. Rajeevlochan College, Rajim 493885 INDIA.

ABSTRACT

The europium (Eu3+) doped barium magnesium silicate (BaMgSiO4: Eu3+) phosphors were prepared by the high temperature and conventional solid state reaction (SSR) method. The obtained phosphor samples crystallized in the hexagonal phase with P63 space group. Excitation and emission spectra as well as luminescence decays were recorded. In the photoluminescence (PL) spectra of the as-synthesized phosphors, two characteristic emission peaks recorded at 596 nm and 614 nm can be attributed to electronic transitions 5D0 → 7F1 (orange region) and 5D0 → 7F2 (red region) of Eu3+ ions. The symmetry of the local environment of Eu3+ activators has been described in the frame of Judd–Ofelt (J–O) parameter by using Ω2 and Ω4 intensity parameters derived from emission spectra. The Judd–Ofelt parameters have also been used to calculate the relative transition probability, the branching ratio and the relative lifetime. The luminescence decay rates of 5D0 excited state have been measured and the corresponding emission quantum efficiency has been calculated. The effective bandwidth of the Eu3+ (Δλeff) and stimulated emission cross-section (σp) were also investigated.

Keywords : Europium, solid state reaction, photoluminescence, J–O parameters.