Tools
Tools
Yap, S.V., Ranson, R.M. 
ORCID: 0000-0002-4619-3982, Cranton, W.M. ORCID: 0000-0002-0142-7810, Koutsogeorgis, D.C. ORCID: 0000-0001-6167-1084 and Hix, G.B.,
2009.
Temperature dependent characteristics of La2O2S: Ln [Ln = Eu,Tb] with various Ln concentrations over 5-60 ºC.
Journal of Luminescence, 129 (5), pp. 416-422.
|
Text
197332_2044 Cranton Postprint.pdf Download (775kB) | Preview |
Abstract
This research is aimed at developing an optical sensor for remotely measuring human skin temperature in electromagnetically hostile environments, such as within a magnetic resonance imaging (MRI) scanner. In this feasibility study, various concentrations of europium doped lanthanum oxysulphide (La2O2S: Eu- 0.1-15 mol % (m/o)) and terbium doped lanthanum oxysulphide (La2O2S: Tb - 0.005-50 m/o) have been investigated in terms of crystallinity, photoluminescent (PL) spectral and decay time characteristics. For both phosphors, X-ray diffraction (XRD) has shown that as dopancy increases, the (100) and (002) reflections merge and there is a reduction in the c-axis parameter as well as the crystallite size. Photoluminescent characterisation (337 nm excitation) has also shown a dependency to dopant concentration through variance of peak intensity. Temperature dependent decay time measurements were carried out over a low temperature range of 5 to 60 °C. Optimum brightness of these temperature dependent lines is achieved at concentrations of 1 and 10 m/o for La2O2S: Eu and La2O2S: Tb respectively. However, optimum temperature dependency is achieved at lower concentration for La2O2S: Eu, specifically at 0.1 m/o. In comparison to conventional phosphor temperature dependent characteristic, La2O2S: Tb showed an increase in decay time with respect to temperature for concentrations above 2 m/o.
| Item Type: | Journal article | ||||
|---|---|---|---|---|---|
| Publication Title: | Journal of Luminescence | ||||
| Creators: | Yap, S.V., Ranson, R.M., Cranton, W.M., Koutsogeorgis, D.C. and Hix, G.B. | ||||
| Publisher: | Elsevier | ||||
| Date: | 2009 | ||||
| Volume: | 129 | ||||
| Number: | 5 | ||||
| Identifiers: |
|
||||
| Divisions: | Schools > School of Science and Technology | ||||
| Record created by: | EPrints Services | ||||
| Date Added: | 09 Oct 2015 10:04 | ||||
| Last Modified: | 24 Mar 2022 14:19 | ||||
| URI: | https://irep.ntu.ac.uk/id/eprint/7141 |
Actions (login required)
 |
Edit View |
Views
Views per month over past year
Downloads
Downloads per month over past year
