Effect of terbium concentration on green emission and supercapacitance properties of Zinc chromite nanoparticles

We synthesized Terbium-doped Zinc chromite nanoparticles (NPs) using the solution combustion method (SCM), followed by calcination at 500 °C for 3 h. XRD analysis confirmed the formation of a cubic spinel structure with extreme purity. Increasing the Tb quantity decreased the crystallite size from 26 to 12.14 nm. Surface morphology showed a mix of irregularly shaped NPs and nanorods. Eg decreased from 3.01 to 2.95 eV. Photoluminescence measurements at 277 nm excitation revealed an emission peak at 554 nm, with concentration quenching at 7 mol%. CIE and CCT coordinates confirmed green emission, suitable for outdoor lighting. Electrochemical analysis using cyclic voltammetry showed super capacitance values ranging from 99.03 to 144.92 F/g, sensitive to Tb quantity. This material shows promise for energy storage and display technology applications. © 2024 Elsevier B.V.