Green synthesis of highly hierarchical CaMoO4 microstructures with tunable morphologies and luminescent properties

Uniform, highly hierarchical CaMoO₄ microstructures with various shapes have been fabricated on a large scale by means of green solution-based synthesis without adding any surfactant in a pure water reaction system. The shape and size of the as-prepared architectures can be tuned effectively by controlling the reaction temperature and pH value of the reaction solution. The photoluminescence spectra display a strong blue emission of CaMoO₄ microstructures and show acidic reaction solution. The higher reaction temperature is in favour for much stronger optical properties of the prepared hierarchical CaMoO₄ microstructures. This Letter sheds some light on the design of well-defined highly hierarchical CaMoO₄ microstructures with tunable optical properties and explores the potential applications of the obtained architectures in an optical device.