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 (${\mathrm{La}}_2{\mathrm{O}}_2\mathrm{S}:\mathrm{Eu}$) and terbium doped lanthanum oxysulphide (${\mathrm{La}}_2{\mathrm{O}}_2\mathrm{S}:\mathrm{Tb}$) are both temperature sensitive to a low temperature range of $10–50°\mathrm{C}$ when under ultraviolet (UV) excitation. The emission spectra and decay time characteristics of these phosphors were demonstrated. The results indicate that ${\mathrm{La}}_2{\mathrm{O}}_2\mathrm{S}:\mathrm{Eu}$ has a quenching rate of $13.7\mathrm{m}°{\mathrm{C}}^{-1}$ and $4\mathrm{m}°{\mathrm{C}}^{-1}$ at $512\mathrm{nm}$ and $538\mathrm{nm}$, respectively. In addition, ${\mathrm{La}}_2{\mathrm{O}}_2\mathrm{S}:\mathrm{Tb}$ has a lower quenching rate of $4.19\mathrm{m}°{\mathrm{C}}^{-1}$ at $548\mathrm{nm}$ due to its faster decay time.

© 2008 Optical Society of America

Luminescence properties of KBaYSi₂O₇:Ce/Eu-Tb phosphors for multifunctional applications

Yuting Fei and Jia Zhang
Appl. Opt. 58(17) 4740-4745 (2019)

Temperature measurements of single droplets by use of laser-induced phosphorescence

Alaa Omrane, Greger Juhlin, Frederik Ossler, and Marcus Aldén
Appl. Opt. 43(17) 3523-3529 (2004)

Surface temperature imaging below 300 K using La₂O₂S:Eu

R. H. Krauss, R. G. Hellier, and J. C. McDaniel
Appl. Opt. 33(18) 3901-3904 (1994)

White light obtainment via tricolor luminescent centers and energy transfer in Ca₃ZrSi₂O₉:Eu³⁺,Bi³⁺,Tb³⁺ phosphors

Zhenzhen Zhou, Guanghui Liu, Jia Ni, Wanlu Liu, and Qian Liu
Opt. Mater. Express 8(11) 3526-3542 (2018)

Single-phase tunable white-light-emitting Sr₃ La(PO₄)₃ : Eu²⁺, Mn²⁺ phosphor for white LEDs

Zhijun Wang, Shuqin Lou, Panlai Li, and Zhenggang Lian
Appl. Opt. 56(4) 1167-1172 (2017)