The present investigation explores the structural and optical properties of Sr3Gd(1-x)(PO4)3: xHo3+ phosphors synthesized through modified citrate sol-gel combustion process. The structural analysis through powder X-ray diffraction technique confirms the body centered cubic structure and it was confirmed by Rietveld analysis. The FESEM analysis explores the uniform distribution of agglomerated spherical particles. The elemental mapping reveals the uniformly distributed elements across the analyzed area and the energy dispersive spectroscopic study clarifies the presence of all the elements with proper weight percentage. The Fourier Transform infrared spectroscopic analysis reveals the presence of various structural bonds. The emission spectra revealed 5F3 → 5I8 (524 nm, pale green), 5F4+5S2 → 5I8 (548 nm, bright green) and 5F5 → 5I8 (646 nm, red) transitions upon suitable excitation. The optimal concentration of Ho3+ ions was obtained as x = 1.0 mol% for intense green emission. The temperature dependent emission investigations support exceptional thermal stability with an activation energy of 0.34 eV. The Sr3Gd(PO4)3: Ho3+ (1.0 mol%) phosphor is well suited for lighting and display devices and also for white LEDs applications.