The pseudo-ilmenite structure ABO 3 have been increasingly highlighted in the optoelectronic area. Nanoparticles of undoped lithium niobates (LiNbO 3 ) and codoped with rare earths (LiNbO 3 : Dy 3+/ Tb 3+ ) were synthesized by the solid-state reaction method and calcined in a controlled way. The properties and structural changes of niobates were evaluated from data obtained in XRD and Rietveld refinement. The SEM-FEG micrographs showed different morphologies obtained (cubes, plates, tetrahedrons and polyhedra) according to the variation of the doping and co-doping process. Optical properties were measured and studied based on the results obtained from the UV-Vis spectrophotometer and photoluminescence assays. The photoluminescence presented by LiNbO 3 was associated with the existence of superficial defects in the particles, i.e., centers of recombination of photogenerated charges favorable to the property. The effect of concentration of dopants was investigated in properties photoluminescence. Photometric measurements (CRI, purity, CCT, LER) were analyzed and a modulation of the emitted color as a function of the concentration of the dopants. According to the obtained results, LiNbO 3 : Dy 3+ /Tb 3+ presents itself as a material with great potential in optical device applications. Graphical Abstract