Effect of Li(I) and TiO₂ on the Upconversion Luminance of Pr:Y₂SiO₅ and Its Photodegradation on Nitrobenzene Wastewater

Figure 4

SEM photos of (a) Li,Pr:Y₂SiO₅ and (b) TiO₂/Li,Pr:Y₂SiO₅ nanomaterials.