Analysis of varying Gd 3+ concentrations on the structure and optical properties of ZnAl 2 O 4 :0.1% Eu 3+ ; x% Gd 3+ (0 ≤ x ≤ 1.2) synthesized via citrate sol-gel method

摘要: We report the preparation of 0.1% Eu3+; x% Gd3+ (0 ≤ x ≤ 1.2) ZnAl2O4 phosphors using citrate sol–gel method. X-ray diffraction (XRD) data revealed that all annealed samples consisted single phase cubic structure. The scanning electron microscopic (SEM) images indicated pronounced effect dual doping on surface morphology phosphor. estimated crystal sizes by XRD was confirmed high-resolution transmission microscopy (HR-TEM) to be approximately around 20 nm. photoluminescence (PL) spectroscopy results four distinct emission peaks located at 393, 400, 578 and 618 nm. 393 400 nm were attributed defect levels different positions host material (ZnAl2O4). peak 618 nm 5D0 → 7F1 2D0 → 7F2 characteristic transition within Eu3+ ions. International Commission Illumination (CIE) colour coordinates not influenced varying concentration Gd3+.