Enhanced photoluminescence from Gd2O3:Eu3+ nanocores with a Y2O3 thin shell
- 24 January 2011
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 21 (9), 3113-3118
- https://doi.org/10.1039/c0jm03275a
Abstract
Nanoparticles of Gd2O3:Eu3+ 20 nm in diameter were synthesized at 180 °C using a facile high boiling-point alcohol (polyol) method. The Gd2O3 nanoparticles, doped with 5 mol% Eu, were crystalline cubic phase and exhibited intense 5D0–7F2 photoluminescence (PL) from Eu3+ after calcination at 600 °C for 2 h in air. Photoluminescence excitation (PLE) data showed that while a small fraction of the emission resulted from direct excitation of Eu3+, most of the excitation resulted from adsorption in the oxygen to europium charge-transfer band between 225 and 275 nm. Transmission electron microscopy (TEM) images showed that the Gd2O3:Eu3+ cores were slightly agglomerated, but the thin Y2O3 shell could not be detected by TEM. X-Ray photoelectron spectroscopy (XPS) was used to detect the thin Y2O3 shell around the Gd2O3:Eu3+ core. Drop-cast thin films of the Gd2O3:Eu3+/Y2O3 core/shell nanoparticles exhibited PL intensities up to 40% larger than from bare core Gd2O3:Eu3+ nanoparticles. Increased PL was attributed to reduced non-radiative recombination based on longer luminescence decay times.Keywords
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