Rietveld Refinement, Morphology, and Optical and Photoluminescence Properties of a β-AgCuMoO Solid Solution.

Corner-truncated cubic β-AgCuMoO microcrystals were synthesized using the hydrothermal method. These were investigated by X-ray diffraction, confirming obtention of the spinel structure 3̅. Through Raman spectroscopy are confirmed all modes for the point group of . The shows a decrease of the band gap from 3.20 to 3.07 eV, with reduction of the conduction band occurring from -0.20 eV (β-AgMoO) to -0.13 eV (β-AgCuMoO), suggesting a p-type behavior for the Cu ion. The field-emission scanning electron microscopy images confirm the morphological changes for β-AgMoO, where potato-like microcrystals were found. Meanwhile, corner-truncated cubic microcrystals for β-AgCuMoO. The photoluminescence (PL) spectrum confirms the increase in the PL emission for β-AgCuMoO, with suppression of the deep defects occurring in the structure caused by oxygen and silver atoms. In contrast, the green region is intensified because of distortions of the Ag-O and Mo-O bonds. Therefore, the β-AgCuMoO solid solution has PL emission with CCT (4510 K) and CIE coordinates ( = 0.372 and = 0.433), which could be interesting properties for applications as light-emitting diodes.