Decay time characteristics of La2O2S:Eu and La2O2S:Tb for use within an optical sensor for human skin temperature measurement

Yap, SV, Ranson, RM ORCID: 0000-0002-4619-3982, Cranton, WM and Koutsogeorgis, D ORCID: 0000-0001-6167-1084, 2008. Decay time characteristics of La2O2S:Eu and La2O2S:Tb for use within an optical sensor for human skin temperature measurement. Applied Optics, 47 (27), pp. 4895-4899.

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Abstract

We focus on the development of a remote temperature sensing technology, i.e., an optical laser-based sensor, using thermographic phosphors for medical applications, particularly within an electromagnetically hostile magnetic resonance imaging (MRI) environment. A MRI scanner uses a strong magnetic field and radio waves to generate images of the inside of the body. The quality of the image improves with increasing magnetic resonance; however, the drawback of applying a greater magnetic strength is the inducement of heat into the body tissue. Therefore, monitoring the patient’s temperature inside MRI is vital, but until now, a practical solution for temperature measurement did not exist. We show europium doped lanthanum oxysulphide (La2O2S∶Eu) and terbium doped lanthanum oxysulphide (La2O2S∶Tb) are both temperature sensitive to a low temperature range of 10–50 °C when under ultraviolet (UV) excitation. The emission spectra and decay time characteristics of these phosphors were demonstrated. The results indicate that La2O2S∶Eu has a quenching rate of 13:7m°C−1 and 4m°C−1 at 512nm and 538 nm, respectively. In addition, La2O2S∶Tb has a lower quenching rate of 4:19m°C−1 at 548nm due to its faster decay time.

Item Type: Journal article
Publication Title: Applied Optics
Creators: Yap, S.V., Ranson, R.M., Cranton, W.M. and Koutsogeorgis, D.
Publisher: Optical Society of America
Date: 2008
Volume: 47
Number: 27
Rights: © 2008 Optical Society of America, Inc.
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 11:10
Last Modified: 09 Jun 2017 13:51
URI: http://irep.ntu.ac.uk/id/eprint/23925

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