Comment on “Tunable thermal quenching properties of Na3Sc2(PO4)3:Eu2+ phosphors tailored by phase transformation details” by Z. Liu et al., Dalton Trans., 2020, 49, 3615
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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