Luminescence and crystallinity of flame-made Y2O3:Eu3+ nanoparticles
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Date
2007
Publication Type
Conference Paper
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yes
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Abstract
Cubic and/or monoclinic Y2O3:Eu3+ nanoparticles (10–50 nm) were made continuously without post-processing by single-step, flame spray pyrolysis (FSP). These particles were characterized by X-ray diffraction, nitrogen adsorption and transmission electron microscopy. Photoluminescence (PL) emission and time-resolved PL intensity decay were measured from these powders. The influence of particle size on PL was examined by annealing (at 700–1300°C for 10 h) as-prepared, initially monoclinic Y2O3:Eu3+ nanoparticles resulting in larger 0.025–1 μm, cubic Y2O3:Eu3+. The influence of europium (Eu3+) content (1–10 wt%) on sintering dynamics as well as optical properties of the resulting powders was investigated. Longer high-temperature particle residence time during FSP resulted in cubic nanoparticles with lower maximum PL intensity than measured by commercial micron-sized bulk Y2O3:Eu3+ phosphor powder. After annealing as-prepared 5 wt% Eu-doped Y2O3 particles at 900, 1100 and 1300°C for 10 h, the PL intensity increased as particle size increased and finally (at 1300°C) showed similar PL intensity as that of commercially available, bulk Y2O3:Eu3+ (5 μm particle size). Eu doping stabilized the monoclinic Y2O3 and shifted the monoclinic to cubic transition towards higher temperatures.
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published
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Journal / series
Volume
18 (1)
Pages / Article No.
5 - 22
Publisher
Elsevier
Event
5th World Congress on Particle Technology (WCPT 2006)
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Subject
Flame spray pyrolysis; nanoparticle; yttria; europium; phosphor
Organisational unit
03306 - Nesper, Reinhard (emeritus)
03510 - Pratsinis, Sotiris E. (emeritus) / Pratsinis, Sotiris E. (emeritus)