Zhou Shaoshuai, Jiang Guicheng, Li Xinyue, Jiang Sha, Wei Xiantao, Chen Yonghu, Yin Min, Duan Changkui
Opt Lett. 2014 Dec 1;39(23):6687-90. doi: 10.1364/OL.39.006687.
Optical thermometers usually make use of the fluorescence intensity ratio of two thermally coupled energy levels, with the relative sensitivity constrained by the limited energy gap. Here we develop a strategy by using the upconversion (UC) emissions originating from two multiplets with opposite temperature dependences to achieve higher relative temperature sensitivity. We show that the intensity ratio of the two UC emissions, ³F(2,3) and ¹G₄, of Tm³⁺ in β-NaYF₄:20%Yb³⁺, 0.5%Tm³⁺/NaYF₄:1%Pr³⁺ core-shell nanoparticles under 980 nm laser excitation exhibits high relative temperature sensitivity between 350 and 510 K, with a maximum of 1.53% K⁻¹ at 417 K. This demonstrates the validity of the strategy, and that the studied material has the potential for high-performance optical thermometry.
光学温度计通常利用两个热耦合能级的荧光强度比，其相对灵敏度受到有限能隙的限制。在此，我们通过利用来自具有相反温度依赖性的两个多重态的上转换（UC）发射来开发一种策略，以实现更高的相对温度灵敏度。我们表明，在980 nm激光激发下，β-NaYF₄:20%Yb³⁺, 0.5%Tm³⁺/NaYF₄:1%Pr³⁺核壳纳米颗粒中Tm³⁺的两种UC发射³F(2,3)和¹G₄的强度比在350至510 K之间表现出高相对温度灵敏度，在417 K时最大值为1.53% K⁻¹。这证明了该策略的有效性，并且所研究的材料具有用于高性能光学测温的潜力。
