Abstract
A new facile synthetic route to produce a nitride-based red-emitting phosphor has been established. The (Sr,Ca)2Si5N8:Eu2+-based multicomponent phosphor was successfully synthesized from the stable SrCO3–CaCO3–Eu2O3–Si3N4 system by simple one-step heating at 1600 °C for 4 h in an unpressurized N2 atmosphere. The synthesized (Sr,Ca)2Si5N8:Eu2+-based red broadband emitting phosphor exhibited the peak wavelength as long as 661 nm with a practically high external quantum efficiency of 60% under the excitation at 450 nm, while the coexisting secondary phase was inactive under the blue-light excitation, showing no detrimental effects on the photoluminescent properties. The enhanced red emission compared to the unmodified Sr2Si5N8:Eu2+ phosphor enables further improvement of the color rendering properties of the white light-emitting diodes for solid-state lighting applications.
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