Abstract
A yellow-orange-emitting Ba2+ codoped Sr 3 SiO 5 : Ce3+, Li+ phosphor was prepared by high-temperature solid-state reaction. Through transitions of 5d→4f in Ce3+, the phosphor showed a very broad and strong yellow emission under near ultraviolet (UV) or blue light excitation. The shifts of the emission band to longer wavelength (yellow-orange) of the Sr 3 SiO 5 : Ce3+, Li+ yellow phosphor under the 450–470 nm excitation range have been achieved by adding the element Ba2+ in the Sr 3 SiO 5 host. White light could be obtained by combining this phosphor with 460nm light-emitting diodes. As the concentrations of the Ba2+, Ce3+ and Li+ ions in the phosphor were 0.35mol, 0.024mol and 0.024mol respectively, the InGaN-based Ba2+ codoped Sr3SiO5: Ce3+, Li+ LED presented intense white emitting and good color rendering of 88.
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