Abstract

Temperature-dependent luminescence of spherical ${\mathrm{NaEuF}}_4$ phosphors with different particle sizes was studied. The thermally coupled ${{}^5\mathrm{D}}_0$ and ${{}^5\mathrm{D}}_1$ level of ${\mathrm{Eu}}^{3+}$ was observed. The linear dependence of emission intensities of ${{}^5\mathrm{D}}_0$ level of ${\mathrm{NaEuF}}_4$ phosphor on temperature confirmed the excellent temperature sensing performance. Sensitivity up to 0.43% is achieved via decreasing the particle size, which is higher than that of reported thermometry based on upconversion of lanthanide ions. Moreover, the original luminescent intensity of 90% was recovered after 10 temperature-changed cycles, indicating good sensing stability. Therefore, spherical ${\mathrm{NaEuF}}_4$ phosphor might be a promising candidate for optical temperature sensors.

© 2014 Optical Society of America

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