Group VI metal oxides featuring MoO42– and WO42– anions are ideal semiconducting host materials for thermosensitive phosphors activated by Mn4+ and/or rare-earth metals. A distinct feature of these materials is their structural diversity in terms of metal coordination and connectivity, which makes them an ideal platform to exercise compositional control over their temperature-dependent luminescence response. In this talk, I will highlight the potential of molybdate and tungstate phosphors as luminescent thermometers. I will show that selected Mn4+-activated metalates serve as bandshift thermometers with a temperature sensitivity comparable to that of quantum dots but with a much broader usable temperature range. Further, I will show how the crystal-chemistry of group VI metalates may be exploited to generate thermochromic phosphors via codoping Mn4+–Tb3+ pairs. Findings presented in this talk expand the scope of applicability of Mn4+-activated thermosensitive phosphors beyond ratiometric bandshape and lifetime thermometry. They also provide structural guidelines for discovering and screening novel oxide hosts for dual-activator luminescent thermometers.

Group VI metalates as thermosensitive phosphors

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ACS Fall 2022

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