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Proceedings Paper

Stability of luminescence decay parameters in oxygen sensitive polymer films doped with Pd-porphyrins
Author(s): Raivo Jaaniso; Tea Avarmaa; Artur Suisalu; Aare Floren; Anni Ruudi; Kristi Õige
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Paper Abstract

An essential factor for the creation of oxygen sensors based on luminescence quenching is the long-term stability of the parameters determining the luminescence decay. In the present work, the effects of material aging and photobleaching on decay parameters are studied for Pd-tetraphenylporphyrin and Pd-pentafluoro-tetraphenylporphyrin molecules embedded into different polymer films. In polymethylmethacrylate host the decay was well described by stretched exponent function. During annealing of PMMA films at different temperatures between 20 and 70 °C during 9 months a logarithmic decrease of the material sensitivity occurred due to the physical aging of the polymer. The photostability studies of PMMA films showed an opposite effect: the photobleaching was accompanied by a decrease in natural decay time, whereas the oxygen sensitivity remained practically constant. Luminescence quenching in polystyrene and polycarbonate films had different character as compared to PMMA, and was interpreted with a two-site model, combined with a nonlinear gas transport model. In these polymer hosts the oxygen sensitivity increased during the first stage of aging, which was ascribed to the changes in the Langmuir component of gas transport, i.e., to the evaluation of microvoids in these glassy polymers.

Paper Details

Date Published: 12 June 2006
PDF: 10 pages
Proc. SPIE 5946, Optical Materials and Applications, 59460L (12 June 2006); doi: 10.1117/12.639170
Show Author Affiliations
Raivo Jaaniso, Univ. of Tartu (Estonia)
Tea Avarmaa, Univ. of Tartu (Estonia)
Artur Suisalu, Univ. of Tartu (Estonia)
Aare Floren, Univ. of Tartu (Estonia)
Anni Ruudi, Univ. of Tartu (Estonia)
Kristi Õige, Univ. of Tartu (Estonia)

Published in SPIE Proceedings Vol. 5946:
Optical Materials and Applications
Arnold Rosental, Editor(s)

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