Photoluminescent properties of nanostructured Y2O3:Eu3+ powders obtained through aerosol synthesis
Gomez, Luz S.
Rabanal, Maria Eugenia
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Red emitting Y2O3:Eu3+ (5 and 10 at.%) submicronic particles were synthesized through ultrasonic spray pyrolysis method from the pure nitrate solutions at 900 degrees C. The employed synthesis conditions (gradual increase of temperature within triple zone reactor and extended residence time) assured formation of spherical, dense, non-agglomerated particles that are nanostructured (crystallite size similar to 20 nm). The as-prepared powders were additionally thermally treated at temperatures up to 1200 degrees C. A bcc la-3 cubic phase presence and exceptional powder morphological features were maintained with heating and are followed with particle structural changes (crystallite growth up to 130 nm). Emission spectra were studied after excitation with 393 nm wavelength and together with the decay lifetimes for Eu3+ ion D-5(0) and D-5(1) levels revealed the effect of powder nanocrystalline nature on its luminescent properties. The emission spectra showed typical Eu3+ D-5(0)- GT F-7(i) (...i = 0, 1, 2, 3, 4) transitions with dominant red emission at 611 nm, while the lifetime measurements revealed the quenching effect with the rise of dopant concentration and its more consistent distribution into host lattice due to the thermal treatment. (C) 2010 Elsevier B.V. All rights reserved.
Keywords:Yttrium oxide / Spray pyrolysis / Nanoparticles / Luminescence
Source:Optical Materials, 2010, 32, 12, 1606-1611
- 2nd International Conference on Physics of Optical Materials and Devices, Aug 27-30, 2009, Herceg Novi, Montenegro