Journal
APPLIED SURFACE SCIENCE
Volume 257, Issue 12, Pages 5204-5207Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2010.11.148
Keywords
Pulsed laser deposition (PLD); Thin film; Photoluminescence; Rare-earth; Erbium (Er); Ytterbium (Yb); Amorphous aluminum oxide (Al2O3)
Categories
Funding
- CICYT, Spain [MAT2009-14369-C02-02]
- MICINN (Spain)
- MICINN [SB-2005-003]
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Alternate pulsed laser deposition from the host (Al2O3) and dopant (Er, Yb) targets has been used to prepare artificially nanostructured films in which the rare earth ion-ion separation is controlled in the nanometer scale in order to control energy transfer between ions. One series of films was prepared in the standard on-axis configuration, i.e. a static substrate being centred with respect to the plasma expansion axis. A second series of films was prepared by rotating the substrate with respect to a shifted axis parallel to the plasma expansion one (off-axis configuration). The latter configuration leads to films with enhanced thickness and Er related photoluminescence intensity uniformity. More interestingly, the Er related photoluminescence lifetime in as-grown films increases upto 2.5 ms, which is much higher than the maximum value of 1ms obtained for the on-axis configuration films. This enhancement is discussed in terms of a decrease of defect density when using the off-axis configuration. (C) 2010 Elsevier B. V. All rights reserved.
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