<p>This study explores the structural, morphological, and optical evolutions resulting from the introduction of Gd (Gadolinium) into ZnO nanostructures, focusing specifically on photoemission properties pertinent to optoelectronic applications. X-ray diffraction confirmed the hexagonal wurtzite structure of ZnO, suggesting efficient Gd replacement without secondary phases with lower concentrations of the dopant and marking the commencement of dopant segregation at higher concentrations. SEM analysis demonstrated that undoped ZnO exhibits fine-grained, porous nanoparticles, while higher Gd doping leads in compact spherical agglomerates resulting from grain coalescence. EDS and XPS analyses confirmed the incorporation of Gd³⁺ ions into the ZnO lattice, with XPS providing explicit evidence of chemical-state stability and successful substitutional doping. Optical studies revealed a blue shift in the band gap with increasing Gd concentration, attributed to the Burstein–Moss effect and Gd-induced lattice strain. Photoluminescence studies indicated that moderate Gd doping enhances near-band-edge emission, while excessive doping increases defect-mediated recombination pathways. The correlated color temperature (CCT) values are found to be lying in the cool-white/blue range, confirming the suitability of Zn₁₋ₓGdₓO nanostructures for blue-emitting LEDs. The photoemission spectroscopic findings confirmed that Gd is a proficient dopant for modifying the electrical structure and luminous properties of ZnO nanostructures for optoelectronic applications.</p>