Synthesis of Rare-Earth-Doped Strontium Tungstate Phosphor at Room Temperature and Applied Flexible Composite

In this study, we successfully synthesized rare-earth-doped crystalline SrWO₄ at room temperature by co-precipitation. The results from the X-ray diffraction analysis showed a main diffraction peak related to the (112) plane. Phosphors doped with either Dy³⁺ or Sm³⁺ ions showed strong light absorption in the UV region and blue-yellow and red light emission. To synthesize a white light phosphor, Dy³⁺ and Sm³⁺ ions were co-doped to produce a SrWO₄:[Sm³⁺]/[Dy³⁺] phosphor. When the Sm³⁺ ion concentration was increased and the Dy³⁺ concentration was maintained, the red light intensity increased while the blue-yellow light intensity decreased. The composites were combined with polydimethylsiloxane (PDMS), and a flexible composite material was fabricated. The composite exhibited various luminescence properties under UV and visible light, which suggested its potential for use as an LED color filter.