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ISRN Materials Science
Volume 2014 (2014), Article ID 856716, 5 pages
http://dx.doi.org/10.1155/2014/856716
Research Article

Excitation Density Dependence of Optical Oxygen Sensing in Poly(9,9-dioctylfluorene) Waveguides Showing Amplified Spontaneous Emission

Dipartimento di Matematica e Fisica “Ennio De Giorgi,” Università del Salento, Via per Arnesano, 73100 Lecce, Italy

Received 10 January 2014; Accepted 3 February 2014; Published 4 March 2014

Academic Editors: P. Bhowmik and E. J. Nassar

Copyright © 2014 M. Anni and S. Lattante. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Reversible oxygen induced emission quenching of both the Spontaneous Emission (SE) and the Amplified Spontaneous Emission (ASE) of poly(9,9-dioctylfluorene) waveguides is demonstrated. We show that ASE shows a stronger quenching than SE, up to about 6.2 times, but also a stronger decrease when the excitation density increases. We conclude that the fast increase of the ASE decay rate is the main process in determining the ASE detection sensitivity, limiting the potentiality of sensitivity improvement of ASE with respect to SE.