Broadband near-infrared luminescence properties of Sc 2 (MoO 4 ) 3 :Cr 3+ molybdates.

The structural and spectroscopic properties of Sc ₂ (MoO ₄ ) ₃ molybdate containing various concentrations of Cr ³⁺ ions were investigated in a temperature range of 80-300 K. The samples were prepared using hydrothermal as well as solid-state reaction methods. The influence of synthesis conditions and the molybdenum source on the structural properties was studied by X-ray diffraction (XRD), IR (infrared), and Raman methods. The optical properties of Sc ₂ (MoO ₄ ) ₃ samples doped with 0.1, 0.5, 1.0, and 2.0 % of Cr ³⁺ ions were investigated. The broadband near-infrared (NIR) luminescence spectra generated from the ⁴ T ₂ and ² E levels of Cr ³⁺ ions may be attractive for NIR light-emitting diode (LED) applications. Emission decay profiles and the crystal field parameters of Cr ³⁺ ions are discussed. In particular, the mechanism of photoluminescence generation and the thermal quenching path are described in detail.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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