Distinct Thermal Quenching of Upconversion and Downshifting Luminescence Caused by Dynamic Defects in Ion-conductive Na3Sc2(PO4)3:Yb3+,Er3+Phosphor
Eu2+-doped Na3Sc2(PO4)3 ionic conductor possesses superior thermal quenching(TQ)resistance,which is considered as a promising phosphor for high-power lighting applications.Yet the underlying mechanism of negative ther-mal quenching(NTQ)is not fully understood.In this study,we focus on upconversion(UC)and downshifting(DS)lumi-nescence of Yb3+/Er3+with f-f transition rather than susceptible d-f transition of Eu2+in Na3Sc2(PO4)3,aiming to get a more insightful view.The results show that thermally accelerated dynamic defects/ions contributes to the significant negative thermal quenching(NTQ)of UC luminescence and thermally stabilized DS luminescence by promoting the radiative transi-tion and suppressing the non-radiative transition.The UC process with slow population rate is more susceptible to perturba-tion of Na+migration process with time scale equivalent to that of the former,resulting in evident NTQ of UC lumines-cence.This research opens an avenue for understanding the NTQ mechanism of luminescence via dynamic defects/ions.
Na3Sc2(PO4)3:Yb3+,Er3+upconversion luminescencedownshifting luminescencenegative thermal quenchingenergy transfer
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