Influence of Ag Nanoparticles on the Photoluminescence of WO₃-WS₂ Flake

A composite of WO3 and WS2 has a wider wavelength range of light adsorption and light emission than WS2. A noble metal nanostructure can be utilized to adjust the photoluminescence (PL) of luminescent materials. In this study, WO3-WS2 flakes were synthesized. A straightforward bath method has been employed to synthesize Ag nanoparticles (NPs). The average size of Ag NPs is approximately 60 nm. The Fourier transform infrared (FT-IR) peak of WO3-WS2 flake at 495 cm(-1) is from an alkane S-S bond stretching vibration. The PL intensity of WO3-WS2 was attenuated subsequent to its integration with Ag NPs. The PL quantum yield of the WO3-WS2/Ag composite can reach 0.11%. This occurrence can be explained by the pronounced resonance absorption and diminished light extraction induced by the Ag NPs. This decreased light emission of the Ag NPs incorporated with WO3-WS2 may be employed in some situations needing extinction, such as photography and projection.