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Effects of the host lattice and doping concentration on the colour of Tb cation emission in YOS:Tb and GdOS:Tb nanometer sized phosphor particles

Nanoscale, ISSN: 2040-3364, Vol: 5, Issue: 18, Page: 8640-8646
2013
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Article Description

YOS and GdOS phosphor lattices activated with a range of Tb concentrations have been successfully prepared as nanoparticles and their emission properties have been characterized using SEM, XRPD, photoluminescence spectroscopy and cathodoluminescence. D-D cross relaxation processes between Tb cations were observed in both YOS and GdOS as a function of Tb concentration. In the YOS host lattice, the predominant emission colour shifts from blue to green with increased Tb concentration. In contrast, green emission is always predominant in GdOS at Tb concentrations from 0.1 mol% to 5 mol%. This finding is explained in accordance with previous reports on the bulk materials that found the GdOS lattice has a lower charge transfer state than the YOS host lattice. © 2013 The Royal Society of Chemistry.

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