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Radioluminescence studies of colloidal oleate-capped β-Na(Gd,Lu)F:Ln nanoparticles (Ln = Ce, Eu, Tb)

Nanoscale, ISSN: 2040-3372, Vol: 10, Issue: 16, Page: 7821-7832
2018
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Article Description

We report on the synthesis, characterization, and radioluminescence quantification of several new varieties of nanoparticles with the general composition β-NaLnF, incorporating known luminescent activator/sensitizer pairs. Using Monte Carlo modeling to complement luminescence measurements, we have calculated the radioluminescence yields and intrinsic conversion efficiencies of colloidally-dispersed nanoparticles by comparison to an organic liquid scintillator. While five of the compositions had low to modest radioluminescence yields relative to bulk materials, colloidal β-Na(LuGdTb)F displayed a strong output of 39460 photons per MeV absorbed, comparable to some of the best non-hygroscopic bulk crystal scintillators and X-ray phosphors such as GdOS:Tb. Measurements of β-Na(LuGdTb)F powder samples revealed persistent luminescence as well as stable charge trapping, warranting further investigation.

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