Yb3+-doped inorganic materials are constantly in demand due to a strong interest in fundamental and applied research. In our latest work with collaborators from Poland and France, we have refined synthesis methods utilizing ILs to establish a straightforward, quick, and reliable synthetic protocol to obtain high-quality nano-crystalline optical materials of Yb3+-doped LuPO4. We revealed an unusual simultaneous emission from two of the lowest levels of the 2F5/2 excited state observed at 77 K, measured for the first time and confirmed by the barycenter law for Yb3+-doped tetragonal LuPO4 revealing the lowest crystal field among Yb3+ ion-activated oxide crystals.
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