Nanocrystalline YMnO₃through microwave reaction followed by Calcination: Insights into structural, optical, and chromaticity properties for potential light emitting device application

In this present work, no reports are available on the chromaticity characteristics of microwave-synthesized YMnO₃ nanostructures for potential LED application. YMnO₃ material was synthesized under different microwave power irradiations (420, 560, and 700 W), followed by calcination at 1100 °C for 2h. Additionally, a 2 wt% yttrium nitrate-assisted YMnO₃ sample was prepared under 420 W irradiation. The synthesized YMnO₃ compounds were extensively characterized to evaluate their structural, morphological, optical, luminescent, and chromaticity features. XRD analysis confirmed the formation of a hexagonal crystal structure. Three characteristic peaks at ∼424, ∼566, and ∼680 cm⁻¹in the FTIR spectra correspond to Y-O and Mn-O vibrations, further validating the formation of YMnO₃. At low magnification, the nanoscale morphology of the 420 W sample exhibited rice-like structures, while high magnification revealed agglomerated spherical particles. SEM images of the YMnO₃ at 560 and 700 W showed a non-uniform distribution of spherical particles and elongated spherical morphologies at magnifications of 1 μm, 300, and 200 nm. The 2 % yttrium-nitrate-assisted YMnO₃ (420 W) exhibited porous structures with numerous smaller spherical particles, as observed at both lower and higher magnifications (1 μm, 300 nm, and 200 nm). The particle size of YMnO₃ was tuned under different microwave power irradiations (420, 560, and 700 W), as confirmed by SEM analysis. EDX analysis confirmed the presence of Y, Mn, and O elements in the synthesized samples. UV–visible spectra of synthesized YMnO₃ revealed strong absorption in both the UV and visible regions, with a narrow optical bandgap of 1.37–2 eV. PL spectra showed UV and visible emission peaks, attributed to electronic transitions and oxygen vacancy defects. The chromaticity coordinates of the 420 W sample corresponded to blue-cyan emission, while the YMnO₃ samples synthesized at 560 W, 700 W, and the 2 wt% yttrium nitrate-assisted YMnO₃ (420 W) exhibited emissions in the yellow region.