Electrospinning preparation and luminescence properties of one-dimensional SrWO4: Sm3+ nanofibers

One-dimensional Sm³⁺ doped SrWO₄ with or without different charge compensation approaches (co-doping Li⁺, Na⁺ and K⁺) nanofibers were prepared by electrospinning. The structure, morphology and luminescence properties of the obtained nanofiber phosphors were investigated. The X-ray diffraction, Fourier transformation infrared and thermogravimetric results show that the Sr_(1?x)WO₄: Sm _x ³⁺ samples crystallize at 700 °C. Scanning electron microscope results indicate that as prepared nanofibers before/after calcination present uniform fiberlike morphology. The luminescence results show that Sr_(1?x)WO₄: Sm _x ³⁺ phosphors can be excited efficiently by ultraviolet (UV) and near-UV light. The emission spectrum consists of three emission peaks at 561, 596 and 643 nm, corresponding to ⁴G_5/2 → ⁶H_5/2, ⁴G_5/2 → ⁶H_7/2 and ⁴G_5/2 → ⁶H_9/2 transitions of Sm³⁺, respectively. The optimal doping concentration of Sm³⁺ in SrWO₄ is experimentally ascertained to be 4 mol%. The introduction of charge compensator R⁺ (R = Li, Na and K) can enhance the emission intensity of phosphors significantly. The co-doping of Li⁺ has the best compensation effect. The present investigation indicates that Sm³⁺ doped SrWO₄ is a promising orange phosphor for light-emitting diode based on UV chip technology.