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Distribution of Eu3+ ions in LaPO4 nanocrystals by R.Y. Wang is a Materials Science article available to read on EtoBox.

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The luminescence spectroscopy of Eu 3þ ions in nanocrystal LaPO 4 is investigated. The distribution of Eu 3þ ions and defects in the LaPO 4 nanocrystal host are revealed by different excitation processes. When exciting the Eu-O charge transfer state, the fluorescence emission spectra show distinct sharp lines that indicate the presence of the crystallographic Eu sites in nanocrystalline LaPO 4 ; when directly exciting the Eu 3þ intra-4f level transitions, the emission spectra exhibit broad features and a change of the spectral intensity pattern, which are attributed to the presence of a disordered phase and the defects due to the surface effect of the nanocrystal. Two different sizes of LaPO 4 :Eu 3þ nanocrystals, whose particle sizes are 5 and 40 nm; respectively, are studied in this work. In these two nanocrystal samples, the main crystallographic Eu 3þ site exhibits the same site symmetry as that in bulk materials. While the Eu 3þ ions in the disordered phase distinguish their presence by an obvious contribution to the emission in the 40 nm sample, a strong defect emission dramatically increases its dominance in the spectra, as the particle size decreases to 5 nm:

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Author

R.Y. Wang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-2313)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)