Synthesis and luminescence properties of Sr(1−x−y−z)MoO4:xEu3+, yBi3+, zR+ (R+ = Li+, Na+, and K+) phosphors

• Eu3+ doped SrMoO4 phosphor can show red emission at ∼616 nm.
• Energy transfer between Bi3+ and Eu3+ ions is observed.
• The mechanism of energy transfer between Bi3+ and Eu3+ ions is discussed.
• Charge compensation of Li+, Na+, and K+ ions to Bi3+ and Eu3+ ions are investigated.

A series of Sr(1−x−y−z)MoO4:xEu3+, yBi3+, zR+ (R+ = Li+, Na+, and K+) phosphors are prepared through solid-state reaction method in air. Eu3+ doped SrMoO4 phosphor can show red emission at ∼616 nm under excitation 275 nm and 397 nm light due to the 5D0 → 7F2 transition of Eu3+ ion, and its emission intensity can be enhanced after co-doping Bi3+ owing to energy transfer between Bi3+ and Eu3+ ions. The mechanism of energy transfer is discussed by the schematic energy level diagrams of Bi3+ and Eu3+ ions. The optimal composition in Eu3+ and Bi3+ co-doped SrMoO4 phosphors is determined to be (Sr0.92Eu0.05Bi0.03)MoO4. The emission intensity of SrMoO4:Eu3+, Bi3+ phosphor is found to be further improved by using Li+, Na+, and K+ ions as charge compensators. These experiment results in the paper are helpful to develop novel and high-efficiency phosphors for white light-emitting diodes.

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