Structural and luminescent characteristic of Sm3+ doped magnesium sulfide borate orange-red phosphor for white LED

Abstract

Polycrystalline compositions based on MgO, SO3 and B2O3 have both scientific and technological importance because of their useful applications. Doping with rare earth elements not only due to a rearrangement in the structure, but also to variation in the luminescence properties. Magnesium sulfide borate doped samarium oxide (MgSBO3:Sm3+) phosphors were prepared by solid state reaction and their structural and luminescence characteristic were studied and reported. IR and Raman spectral studies have been made to explore the presence of functional groups and various structural units in the prepared Polycrystalline. The formation of SO4, BO4, BO3, B-O-B and S-O-B structural units have been investigated. The emission and excitation properties were studied. And the results show that the emission and excitation spectra of these phosphors can be excited by ultraviolet (UV) 341, 370 and 403 nm light, and emit green, yellow and red light with intense peak at 601 nm, which are nicely in accordance with the widely applied near- UV LED chip. The emission spectral intensity of Sm3+ ions in the titled phosphors increases up to 1 mol% of Sm3+ ions and then decreases for 1.5 mol%. These results indicate that MgSBO3:Sm3+phosphor could be a potential suitable orange-red emitting phosphor candidate for white LEDs with excitation of a ~403 nm near UV LED chip.