Broadband near-infrared luminescence properties of Sc2(MoO4)3:Cr3+ molybdates

D Stefańska; A Kabański; M Adaszyński; M Ptak; R Lisiecki; N Starościk; J Hanuza

doi:10.1016/j.saa.2023.122699

Broadband near-infrared luminescence properties of Sc₂(MoO₄)₃:Cr³⁺ molybdates

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Aug 5:296:122699. doi: 10.1016/j.saa.2023.122699. Epub 2023 Apr 1.

Authors

D Stefańska¹, A Kabański², M Adaszyński², M Ptak², R Lisiecki², N Starościk³, J Hanuza²

Affiliations

¹ Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna 2, 50-422 Wroclaw, Poland. Electronic address: D.Stefanska@intibs.pl.
² Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okolna 2, 50-422 Wroclaw, Poland.
³ Wrocław University of Science and Technology, Faculty of Chemistry, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.

PMID: 37023656
DOI: 10.1016/j.saa.2023.122699

Abstract

The structural and spectroscopic properties of Sc₂(MoO₄)₃ molybdate containing various concentrations of Cr³⁺ 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 Sc₂(MoO₄)₃ samples doped with 0.1, 0.5, 1.0, and 2.0 % of Cr³⁺ ions were investigated. The broadband near-infrared (NIR) luminescence spectra generated from the ⁴T₂ and ²E levels of Cr³⁺ ions may be attractive for NIR light-emitting diode (LED) applications. Emission decay profiles and the crystal field parameters of Cr³⁺ ions are discussed. In particular, the mechanism of photoluminescence generation and the thermal quenching path are described in detail.

Keywords: Chromium; Molybdate; Near-infrared luminescence; Scandium.