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In this present work, a room temperature coprecipitation method for the synthesis of CaMoO 4 @SiO 2 :Ln (Eu3+, Tb3+, Dy3+) phosphors was reported. These particles were characterized using X-ray diffraction (XRD), Energy dispersive spectrometer (EDS), Fourier Transform IR spectroscopy (FTIR), scanning electron microscope (SEM), UV-visible spectrophotometer and photoluminescence (PL) respectively. The results indicated that emission intensity of SiO 2 modified samples increased by about 2 times, compared with no-silica modified samples. Multicolor phosphors were also designed by changing the lattice activators (Eu3+, Tb3+, Dy3+). To further explore its applications, the transparent photoluminescent film was developed through the incorporation of polyvinyl alcohol (PVA), and selective and sensitive detection performance on dichromate was demonstrated in detail. In addition, red emission LED devices was assembled with as-prepared phosphors. The present results provide not only the high-performance phosphors modified by silica, but also a deep explanation of the structure-property relationship of the as-prepared sample. Based on these findings, it can be foreseen that these microparticles will be applied in versatile filed. Graphical Abstract: The design of CMO:Eu3+@SiO 2 and its functional applications. Image 1 • A co-precipitation method for preparation of samples was proposed. • The emission intensity of samples increased about 2-fold after modificating by SiO 2. • The enhancement mechanism of CaMoO 4 @SiO 2 : Eu3+ was discussed in detail. • The applications in luminescent film, LED devices and Cr 2 O 7 2- probe were designed. [ABSTRACT FROM AUTHOR]