Optical studies of ZnO nanocrystals doped with Eu3+ ions
authors Peres, M; Cruz, A; Pereira, S; Correia, MR; Soares, MJ; Neves, A; Carmo, MC; Monteiro, T; Pereira, AS; Martins, MA; Trindade, T; Alves, E; Nobre, SS; Ferreira, RAS
nationality International
journal APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
keywords IMPLANTED GAN; QUANTUM DOTS; THIN-FILMS; PHOTOLUMINESCENCE; SAMPLES; GREEN; LUMINESCENCE
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-4f(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 similar to 200 meV below the conduction band to this intrinsic defect.
publisher SPRINGER
issn 0947-8396
year published 2007
volume 88
issue 1
beginning page 129
ending page 133
digital object identifier (doi) 10.1007/s00339-007-3941-9
web of science category Materials Science, Multidisciplinary; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000246561200024
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journal impact factor 1.81
5 year journal impact factor 1.668
category normalized journal impact factor percentile 37.104
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