<p>The current study uses the solution precipitation synthesis method to synthesize color-tunable [Eu_xTb_1-x.NFLX₃.phen] mixed complexes. This was achieved by varying the concentrations of Eu³⁺ and Tb³⁺ ions to produce white light emission. Color tuning was anticipated by examining the photoluminescent excitation and emission spectra. The synthesized complexes exhibit tunable photoluminescence, achieving near-white light emission as indicated by the calculated CIE 1931 chromaticity coordinates (<i>x</i> = 0.3033, <i>y</i> = 0.3381). Complex composition is ascertained using elemental analysis. Energy-dispersive X-ray analysis was used to determine the purity of the complexes. X-ray powder diffraction and scanning electron microscopy were employed to investigate the amorphous properties and structural morphology of the synthesized complex. Cyclic voltammetry measurements were performed on the synthesized complexes to investigate their redox behavior and electrochemical stability. Important photophysical parameters were quantitatively evaluated, such as Judd–Ofelt intensity factors (Ω_<i>λ</i>). These materials exhibit great potential for incorporation into semiconductor technology and solar cell devices based on their optical bandgap properties, Urbach energies, and refractive indices. Latent fingerprint visualization was successfully achieved under UV illumination, enabling clear observation of the ridge patterns on the glass slide. The findings indicate that it has great potential as an excellent color-tunable luminescent material for solid-state displays and lighting.</p>