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Yap, S.V., Ranson, R.M. 
ORCID: 0000-0002-4619-3982, Cranton, W.M. ORCID: 0000-0002-0142-7810 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 |
| Record created by: | EPrints Services |
| Date Added: | 09 Oct 2015 11:10 |
| Last Modified: | 24 Mar 2022 14:20 |
| URI: | https://irep.ntu.ac.uk/id/eprint/23925 |
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