Abstract
Liu et al. (Dalton Trans., 2020, 49, 3615-3621) reported that emission of the Na3Sc2(PO4)3:Eu2+ phosphor showed tunable thermal quenching properties which were ascribed to the thermal event associated with polymorphic phase transformations. In this comment, I argue that the abnormal negative thermal quenching of the Na3Sc2(PO4)3:Eu2+ phosphor could be a pitfall caused by a diminishment in the optical path lengths of the spectrofluorometer originating from a continuous increase in the volume of the phosphor due to lattice thermal expansion and phase transformation at elevated temperatures.
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