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Título : Critical separation for efficient Tm³+–Tm³+ energy transfer evidenced in nanostructured Tm³+:Al₂O₃ thin films
Autor : Xiao, Zhisong, Serna, Rosalía, Xu, Fei, Afonso, Carmen N.
Palabras clave : [OCIS] ntegrated optics : Integrated optics materials
[OCIS] Materials : Rare-earth-doped materials
[OCIS] Optoelectronics : Photoluminescence
[OCIS] Spectroscopy : Spectroscopy, fluorescence and luminescence
Fecha de publicación : 14-Mar-2008
Editor: Optical Society of America
Resumen: Nanostructured amorphous Al oxide (a-Al₂O₃) thin films doped with Tm³+ were synthesized by alternate pulsed laser deposition. The Tm³+ ions have been deposited in layers with in-depth separation ranging from 0.75 to 6nm . The films show two broad emission bands originated from the Tm³+ ³H₄ → ³F₄ and ³F₄ → ³H₆ transitions. Their intensity increases at a similar rate and the lifetimes are not modified as the layer separation decreases down to 1.5nm , suggesting that there is no concentration quenching. At the critical value of 1.5nm the onset of Tm³+ – Tm³+ 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 ³F₄ → ³H₆ transition is much higher than that for the ³H₄ → ³F₄ transition, evidencing quenching of the ³H₄ → ³F₄ transition through a cross-relaxation mechanism. The control of the Tm³+ 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.
Descripción : 3 pags. ; 2 figs.
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ISSN: 0146-9592
DOI: 10.1364/OL.33.000608
Citación : Optics Letters, 33(6):608-610(2008)
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