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Vol. 119, Issue 8, August 2010, pp.14-21




Optical Temperature Probe Based on the Fluorescence Decay Time of Tris-(dibenzoylmethane) mono (5-amino-1,10-phenanthroline)-europium(III)


Hung T. LAM, *Leah TOLOSA, Govind RAO

Center of Advanced Sensor Technology, 1000 Hilltop Circle, University of Maryland Baltimore County, Baltimore, MD 21250, USA

Tel.: +1 410 455 6567, fax: +1 410 455 1000

E-mail: leah@umbc.edu



Received: 17 June 2010   /Accepted: 17 August 2010   /Published: 31 August 2010


Abstract: The measurement of temperature is essential in defining the physical and chemical properties of any system. This is particularly true in dynamic systems where the temperature may fluctuate during the process. In this paper we investigated the potential of tris-(dibenzoylmethane) mono (5-amino-1, 10-phenanthroline)-europium(III) ( Eu[tdap] ) as an optical temperature probe. The principle of the measurement is based on the temperature dependence of the fluorescence decay time of Eu(tdap) embedded in polystyrene. Within the investigated temperature range between 3 and 70C a linear correlation between temperature and decay time was found. The probe is accurate and repeatable and there is no cross-sensitivity to pH changes. Continuous measurement for more than 2.5 hours at which the temperature is switched between two different temperatures shows no signal drift. The relative standard deviation is less than 0.65 percent.


Keywords: Temperature sensor, Fluorescence, Decay time, Europium


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