Near-infrared Emission in Na5Y(WO_4)4 : Nd3+
Pusdekar A.1, Ugemuge N. S.1, Nafdey R. A.2, Moharil S. V.3
1Department of Physics, Anand Niketan College, Anandwan, Warora, India
2Department of Physics, Shri Ramdeobaba College of Engineering and Management, Nagpur, India
3Department of Physics, RTM Nagpur University, Nagpur, India

Luminescence in Na5Y(WO_4)4 : Nd3+ is investigated for the first time. The emission is in the near-infrared region. The well-known ^4F3/2->^4I9/2 transition leads to most intense line at 1069 nm. The excitation and emission spectra are interpreted using the energy level diagram of Nd3+. The excitation spectrum is made up of a large number of sharp lines attributable to various f-f transitions. A weak band at 360 nm in the excitation spectrum is assigned to the host. Notwithstanding large Y-Y distances, the luminescence is quenched at concentrations exceeding 2 mol.%. The critical distance for energy transfer among Nd3+ ions is found to be 32.85 Angstrem. Keywords: luminescence, phosphor, tungstate, Nd3+.
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