Abstract
NaMgF3:0.1%Eu nanocuboids capped with oleic acid were synthesised via a hydrothermal synthesis technique. Subsequent ligand exchange using 2-thenoyltrifluoroacetone resulted in a massive sensitisation of the Eu3+ photoluminescence where the intensity of the 5D0 → 7F2 transition increased by over 40 000×, relative to the oleic acid-capped nanoparticles. Large Judd-Ofelt Ω2 parameters indicated that the sensitised Eu3+ emissions originated primarily from distorted Eu3+ sites near the nanoparticle surfaces. The massive enhancement of the Eu3+ photoluminescence in 2-thenoyltrifluoroacetone sensitised NaMgF3:Eu nanoparticles encourages applications that include ultra-high resolution optical temperature sensors and dosimeters.
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