Intense red-emitting double perovskite Sr3LiSbO6 (SLSO) phosphor materials have been prepared by doping of Eu3+ rare earth ion using the facile solid-state reaction route. The obtained results displayed the hexagonal structure of the sample, having space group R3c. Diffuse reflectance spectra also reflected the 3.42eV optical band gap of SLSO: 2%Eu3+ which was less than that of the pure SLSO (3.5eV), consequently showing the negative Burstein Moss effect. Photoluminescence (PL) emission spectra showed a concentration quenching effect beyond the 2mol% of Eu3+ doping concentration, indicating the involvement of dipole-dipole interaction. The lifetime of the prepared phosphor was estimated by the PL decay curve; with an average decay time of 808.6 μs. Photometric studies revealed the required lesser correlated color temperature (CCT) values (<1900K) with high color purity (CP) of 99% and Commission International de’Eclairage (CIE) coordinates were located around the red region. Drawn results demonstrated that the proposed phosphor could be a promising strong red-emitting phosphor for the white light-emitting diode (wLED) based on ultra-violet UV or blue chip.