LUMINESCENCE BEHAVIOUR OF DY3+ ION DOPED MAGNESIUM SULFOBORATE PHOSPHOR FOR WHITE LIGHT EMITTING DIODES

Abstract

Several studies showed the interesting properties of trivalent lanthanide ions when doped in various types of phosphor. Magnesium sulfoborate phosphor doped with different concentrations of Dy³⁺ were synthesized using solid-state reaction method at 850 °C for 4 hours. The samples were characterized by X-ray Diffraction (XRD). The excitation and luminescence properties of MgO-SO₄-B₂O₃:Dy³⁺ were determined. The emission spectrum of Dy³⁺ ion doped MgO-SO₄-B₂O₃ phosphor exhibit three bands at 480 nm, 573 nm and 660 nm with excitation of 386 nm due to ⁴F_9/2 →⁶H_15/2, ⁶H_13/2 and ⁶H_11/2 of Dy³⁺ transitions, respectively. The excitation spectrum of Dy³⁺ ion doped MgO-SO₄-B₂O₃ phosphor display several bands at 347 nm, 362 nm, 386 nm, 426 nm, 449 nm and 469 nm with emission of 573 nm, which is in agreement with the ultraviolet LED (349.9–410 nm) and blue LED (450–470 nm). An intense in the emission peak at 573 nm in the yellow region was observed with the 0.5 Dy₂O₃. The luminescence properties of phosphor show that MgO-SO₄-B₂O₃:Dy³⁺ phosphor could be potentially used as white LEDs.

Dalhatu, A. S. | Department of Physics, Bauchi State University Nigeria, 65 Gadau, Bauchi, Nigeria