Red phosphor SrWO4:Eu3+ for potential application in white LED

A series of red light emissive phosphors Sr1−xWO4:Eux3+ (x = 0.02–0.10) and Sr0.84WO4:Eu0.083+, M0.08+ (M = Li, Na, K) were prepared through solid-state reactions, and their luminescent properties were studied. The influences of contents of Eu3+ and charge compensators on the luminescent properties were discussed. Both the fluorescent intensities and quantum yields are greatly improved through adding charge compensators. The phosphors can be effectively excited by the light of 394 and 465 nm, and show bright red emissions. The decay curves are well fitted with single exponential decay models. Furthermore, the temperature-dependent luminescence indicates the phosphors exhibit small thermal-quenching properties. So the phosphors are able to be applied to white light-emitting diodes.

Research highlights
► We prepared Eu3+ doped and Eu3+, M+ (M = Li, Na, K) co-doped SrWO4 phosphors.
► The phosphors can be effectively excited by the light of 394 and 465 nm.
► Charge compensators can improve the fluorescent intensities and quantum yields.
► The phosphors have small thermal-quenching properties.
► The phosphors show good suitability for applied in white LEDs.