The structure, luminescence spectroscopy, and lifetime decay dynamics of Eu2O3 nanoparticles formed in MCM-41 have been investigated. Both X-ray diffraction and high resolution transmission electron microscope observations indicate that Eu2O3 nanoparticles of monoclinic structure are formed inside channels of MCM-41 by heating at 140o C. However, heat treatment at 600 and 700o C causes migration of Eu2O3 from the MCM-41 channels forming nanoparticles of cubic structure outside of the MCM-41 channels. The feature of the hypersensitive 5D0 ? 7F2 emission profile of Eu3+ is used to follow the structural changes. Photoluminescence lifetimes show the existence of short (
Revised: November 20, 2003 |
Published: July 18, 2002
Citation
Chen W., A.G. Joly, G.A. Kowalchuk, J. Malm, Y. Huang, and J. Bovin. 2002.Structure, Luminescence, and Dynamics of Eu2O3 Nanoparticles in MCM-41.Journal of Physical Chemistry B 106, no. 28:7034-7041.PNNL-SA-36359.