Abstract
BaWO4:Sm3+, Mo6+/K+ phosphors are synthesized by a high temperature solid-state reaction method in air. The very strong emission bands peaking at ~600 and 644 nm and the strongest excitation band peaking at ~403 nm are assigned to the 4G5/2 → 6HJ (J = 7/2 and 9/2) and 6H5/2 → 4F7/2 transitions of Sm3+ ion, respectively. The optimal Sm3+ doping concentration is ~5 mol%. Emission intensity of BaWO4:Sm3+ phosphor is increased more than twice owing to charge compensation when the K+ ion is codoped as charge compensator, however, Mo6+ ions is small influence to its emission intensity. The energy transfers and luminous mechanism are explained by using energy level diagrams of WO42− group and Sm3+ ion. Lifetimes of Ba0.925WO4:0.05Sm3+, Ba0.925W0.9Mo0.1O4:0.05Sm3+, and Ba0.9K0.05WO4:0.05Sm3+ phosphors with excitation 403 nm are about 0.933, 0.882, and 0.693 ms, respectively. The experiment results indicate that BaWO4:Sm3+, Mo6+/K+ phosphors will be a potential red phosphor candidate for white LEDs based on near UV (~403 nm) LED chip and research contents are useful to improve luminescence properties of Sm3+-doped phosphors.
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