Study on Photoluminescence Properties and Mechanism of WO3/MnWO4 Red Component Phosphors for Potential Applications in LED

In this article, we report the preparation and characterization of WO3/MnWO4 phosphors, a novel material for potential applications in LED as red component phosphors. The WO3/MnWO4 phosphors with different MnWO4 mass percentages were prepared by two-step sol-gel method in the presence of monoclinic MnWO4 dispersed in the host lattice of triclinic WO3. Investigations using X-ray diffraction and Fourier transformed infrared spectroscopy confirmed the formation of I-type band arrangement of WO3/MnWO4 phosphors. Scanning electron microscopy shows that the particle size of WO3/MnWO4 phosphors increases with the composite formation. The I-type band arrangement of WO3/MnWO4 phosphors doesn’t change the energy band value of the main lattice, and an interface defect is introduced at the interface of WO3 and MnWO4. The WO3/MnWO4 phosphors exhibit two emission peaks at 710 and 750 nm due to high electron hole – pair recombination rate and interface defect. The particular band arrangement, optical and photoluminescence properties of WO3/MnWO4 phosphors can be applied to explore the potential applications in LED and optoelectronics.