Controllable synthesis and morphology-dependent light emission efficiency of Zn₂GeO₄ nanophosphors

Zn₂GeO₄ is considered a very promising alternative to current luminescent semiconductors. Previous results suggest that its emitted wavelength may depend on different variables, such as particle size and morphology, among others. In this work, we have prepared pure and highly homogeneous Zn₂GeO₄ nanorods under hydrothermal synthesis conditions with a willemite-like structure. Their luminescent properties have been explored and their band gap is estimated, which are distinct from those of previously reported Zn₂GeO₄ bulk particles. Therefore, our results identify particle morphology as a crucial factor for maximizing and fine-tuning the luminescence of Zn₂GeO₄ nano-phosphors.