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

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