Abstract
Temperature-dependent luminescence of spherical phosphors with different particle sizes was studied. The thermally coupled and level of was observed. The linear dependence of emission intensities of level of 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 phosphor might be a promising candidate for optical temperature sensors.
© 2014 Optical Society of America
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