Multicolour tuning of different RE ion doped CaMoO₄ nanoparticles by single wavelength excitation

A novel Li⁺ co-doped RE doped CaMoO₄ nanospheres were synthesized adopting polyol technique under urea hydrolysis method. XRD confirms that all the ensued particles are crystallized in the scheelite type tetragonal phase. Transmission electron microscopy observation confirms the formation of small spherical undoped and 5 at % Eu³⁺, Sm³⁺ and Dy³⁺ doped CaMoO₄ NPs with a narrow particle size distribution and an average particles diameter of ̴10.64, 7.18, 3.77 and 3.62 nm, respectively. An increase in the emission intensity with the incorporation of Li ion in the host lattice was discussed in detail. It was found that Li⁺ ion act as a charge compensator or sensitizer for decreasing emission intensity ratios of MoO₄²⁻ group to the activator ions. Our work may provide an alternative pathway for tailoring nanocrystals with enhanced optical properties, paving the way for their utilities in the commercialization in optical display systems, lasers and optoelectronic devices.