Abstract The Near-infrared (NIR) nanothermometer has a novel application in medical treatment and biological sensing. Well dispersed β-NaYF4: Er3+ nanoparticles were synthesized and investigated for application of NIR optical temperature sensing. The fluorescence intensities of 837 nm and 980 nm with function of temperature were measured from 113 K to 443 K under 517 nm excitation. As the temperature rises, opposite changing trend of these two emissions was observed and confirmed theoretically. The fluorescence intensity ratios of 980 nm–837 nm in different temperatures were studied to investigate the NIR temperature sensing performance. High temperature sensitivity S (0.1914 K−1 at 443 K) and relative temperature sensitivity Sr (2.1% K−1 at 290 K) were obtained. Moreover, in the biological temperature sensing range from 270 K to 320 K, the value of Sr is greater than 2.0%. The result indicates that β-NaYF4: Er3+ NPs presents great NIR temperature sensing performance and has potential application in biological temperature sensing.

中文翻译：

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基于 β-NaYF4: Er3+ 纳米粒子的具有高效相对灵敏度的 NIR 光学温度传感

摘要 近红外（NIR）纳米温度计在医疗和生物传感方面有着新的应用。合成了分散良好的 β-NaYF4: Er3+ 纳米粒子，并研究了其在 NIR 光学温度传感中的应用。在 517 nm 激发下，在 113 K 至 443 K 范围内测量了 837 nm 和 980 nm 的荧光强度与温度的函数关系。随着温度的升高，这两种排放量的变化趋势相反，并在理论上得到证实。研究了不同温度下 980 nm–837 nm 的荧光强度比，以研究 NIR 温度传感性能。获得了高温灵敏度 S（443 K 时为 0.1914 K-1）和相对温度灵敏度 Sr（290 K 时为 2.1% K-1）。此外，在生物温度传感范围从 270 K 到 320 K，Sr值大于2.0%。结果表明β-NaYF4：Er3+ NPs具有良好的近红外温度传感性能，在生物温度传感方面具有潜在的应用价值。