Morphology-controlled synthesis of Eu~(3+)-doped calcium molybdate red phosphors via a facile room temperature precipitation route

摘要

Hyperfine red phosphors composed of Eu~(3+) ion-doped CaMoO4 with varying morphologies were prepared via a facile precipitation method at room temperature without any organic additives. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and photoluminescence (PL) spectroscopy were used to characterize the synthesized products. The morphologies of the prepared CaMoO4:Eu~(3+) phosphors were controllable by adjusting the fundamental experimental conditions such as the pH value of the initial solution, the molar ratios of Ca(NO3)2/(NH4)6Mo7O_(24), the concentrations of the reactants, the precipitation reagents, and the raw materials. The formation process of CaMoO4: Eu~(3+) based on the aging time is discussed in detail. The room-temperature photoluminescence properties of the as-prepared CaMoO4:Eu~(3+) phosphors under diverse experimental conditions were also studied systematically, and their emission spectra showed emission characteristic of Eu~(3+).