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Description
Double perovskites are known for their wide, indirect band gaps. However, systematic investigations into the effect of annealing temperature on the coupled structural evolution, morphology, and defect-related optical properties of undoped La₂ZnTiO₆ remain limited. Therefore, this study investigates the effect of annealing temperature on the structural, morphological, and optical properties of La₂ZnTiO₆. In this work, La₂ZnTiO₆ was synthesized using a low-temperature sol–gel method. X-ray diffraction analysis showed that, as the annealing temperature increases, the crystallite size increases while the interplanar spacing decreases, with a single-phase structure forming above 600 °C. Scanning electron microscopy revealed that higher annealing temperatures yield more coalesced, denser surfaces with well-defined grains. UV–Vis analysis indicated an indirect band gap of 3.33 eV. Photoluminescence studies showed excitation peaks centered at 369, 405, 417, and 512 nm. A strong red emission band centered at 701 nm was observed under 369 nm excitation, attributed to deep-level defects. Furthermore, the color rendering index (CRI, Ra) indicated that the excitation wavelength strongly influences the material's luminescence. These results highlight the significant role of annealing temperature in tuning the properties of La₂ZnTiO₆ for potential optoelectronic applications.
| Apply for student award at which level: | MSc |
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| Consent on use of personal information: Abstract Submission | Yes, I ACCEPT |