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Terbium and holmium codoped yttrium phosphate as non-contact optical temperature sensors

机译：and和co共掺杂磷酸钇作为非接触式光学温度传感器

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Optical thermometry has attracted many studies for non-contact high-resolution real-time temperature sensing. Most promising approaches are based on the ratio of up-converted luminescence intensities of two thermally coupled excited states. Here, we proposed a new strategy utilizing the temperature dependence of the anti-Stokes luminescence by exciting a thermally populated low-lying state to the excited state. Our scheme not only retains the advantage of previous approaches in reducing noise from the Stokes-type stray light, but also has the advantage of high quantum yield as a result of a one-photon excitation process. The temperature-dependent luminescence of Tb3+, Ho3+ codoped YPO4 is employed to demonstrate our scheme. The results show that, under a certain excitation, the emission of Tb3+ enhances dramatically while that of Ho3+ declines with increasing temperature. The sharp temperature-dependent intensity ratio was used to calibrate temperature. A maximum relative sensitivity of 2.51% K?1 at 310 K was obtained, substantially superior to values previously reported for acknowledged optical thermometry phosphors. These results indicate that the YPO4:Tb3+,Ho3+ can be a promising candidate to achieve accurate optical temperature sensing with a high sensitivity, and the mechanism proposed can be used to develop better optical thermometry.
机译：光学测温技术吸引了许多非接触式高分辨率实时温度感测研究。最有前途的方法是基于两个热耦合激发态的上转换发光强度之比。在这里，我们提出了一种新的策略，该策略通过将热填充的低洼状态激发到激发态来利用反斯托克斯发光的温度依赖性。我们的方案不仅保留了先前方法在减少来自Stokes型杂散光的噪声方面的优势，而且由于单光子激发过程而具有高量子产率的优点。 Tb 3 + ，Ho 3 + 共掺杂的YPO 4的温度依赖性发光 用于演示我们的方案。结果表明，在一定激发下，Tb 3 + 的发射显着增强，而Ho 3 + 的发射显着增加。随温度升高而下降。尖锐的温度依赖性强度比用于校准温度。在310 K下获得的最大相对灵敏度为2.51％K ？1 ，大大优于先前报道的公认的光学测温磷光体。这些结果表明YPO 4 ：Tb 3 + ，Ho 3+ < / sup> 可能是实现具有高灵敏度的精确光学温度感测的有希望的候选者，并且所提出的机制可用于开发更好的光学测温法。

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