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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 33, Iss. 6 — Mar. 15, 2008
  • pp: 608–610

Critical separation for efficient Tm 3 + Tm 3 + energy transfer evidenced in nanostructured Tm 3 + : Al 2 O 3 thin films

Zhisong Xiao, R. Serna, Fei Xu, and C. N. Afonso  »View Author Affiliations


Optics Letters, Vol. 33, Issue 6, pp. 608-610 (2008)
http://dx.doi.org/10.1364/OL.33.000608


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Abstract

Nanostructured amorphous Al oxide ( a - Al 2 O 3 ) thin films doped with Tm 3 + were synthesized by alternate pulsed laser deposition. The Tm 3 + ions have been deposited in layers with in-depth separation ranging from 0.75 to 6 nm . The films show two broad emission bands originated from the Tm 3 + H 4 3 F 4 3 and F 4 3 H 6 3 transitions. Their intensity increases at a similar rate and the lifetimes are not modified as the layer separation decreases down to 1.5 nm , suggesting that there is no concentration quenching. At the critical value of 1.5 nm the onset of Tm 3 + Tm 3 + energy transfer is evidenced by a sharp decrease of the emission intensity and lifetime. Below this critical value, the rate at which the intensity increases for the F 4 3 H 6 3 transition is much higher than that for the H 4 3 F 4 3 transition, evidencing quenching of the H 4 3 F 4 3 transition through a cross-relaxation mechanism. The control of the Tm 3 + ions in the nanometer scale allows evidencing the onset of energy transfer processes among ions and offers a route to optimize compact photonic gain integrated devices.

© 2008 Optical Society of America

OCIS Codes
(130.3130) Integrated optics : Integrated optics materials
(160.5690) Materials : Rare-earth-doped materials
(250.5230) Optoelectronics : Photoluminescence
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

ToC Category:
Spectroscopy

History
Original Manuscript: November 19, 2007
Revised Manuscript: December 28, 2007
Manuscript Accepted: February 7, 2008
Published: March 14, 2008

Citation
Zhisong Xiao, R. Serna, Fei Xu, and C. N. Afonso, "Critical separation for efficient Tm3+-Tm3+ energy transfer evidenced in nanostructured Tm3+:Al2O3 thin films," Opt. Lett. 33, 608-610 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-6-608


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