The Effect of 2D Van der Waals Materials on the Photoresponse of Upconversion Nanoparticles

Upconversion materials, a type of novel functional materials, have manygood physicochemical properties, such as high luminescence stability, highchemical stability, long luminous life, and low potential biotoxicity. How toregulate the luminescence of upconversion materials is a significant chal-lenge. Two-dimensional (2D) Van der Waals materials are a new type ofnanomaterials with a layer structure. Some of them are capable of quenchingthe luminescence of dyes, which could be applied in the modulation of opticalresponse of upconversion materials. Therefore, in this work, we explored thephotoresponse of β-NaYF4:Yb/Er triggered by 2D Van der Waals materialsincluding graphene oxide, MoS2, g-C3N4 and BN. The results obtained inthis work would be beneficial for the further application of luminescencemodulation of UCNPs. Using UCNPs as a potential fingerprint of 2D Vander Waals materials, their optical response might be used to distinguish the2D Van der Waals materials.