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|title: ||Optical studies of ZnO nanocrystals doped with Eu3+ ions|
|authors: ||Peres, M.|
Correia, M. R.
Soares, M. J.
Carmo, M. C.
Pereira, A. S.
Martins, M. A.
Nobre, S. S.
Ferreira, R.A. Sá
|keywords: ||Eu-doped ZnO nanocrystals|
|issue date: ||Jan-2007|
|publisher: ||Springer Verlag|
|abstract: ||Synthetic ZnO nanocrystals have been intentionally
doped with Eu3+ ions. Structural analysis performed on
the nanocrystals showed wurtzite-ZnO as the only phase present
in the samples. Photoluminescence in emission and excitation
modes allows the assignment of the intra-4 f 6 transitions for the
Eu3+ ions. From the analysis of the optical data we are able to
demonstrate that multiple Eu-related optical centres are present
in the studied samples. Oxygen vacancies are likely candidates
to be responsible for the ion accommodation in the ZnO lattice
and from the photoluminescence excitation data we tentatively
assign a trap level at ∼ 200 meV below the conduction band to
this intrinsic defect.|
|source: ||Applied Physics A: Materials Science and Processing|
|appears in collections||CICECO - Artigos|
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