在聚甲基丙烯酸甲酯微纤维中分散上转换纳米晶体：一种用于温度传感的新方法。

Shahzad Muhammad Khuram, Zhang Yundong, Cui Lugui, Liu Lu, Butt Mehwish Khalid, Li Hanyang

National Key Laboratory of Tunable Laser Technology, Institute of Opto-Electronics, Department of Electronics Science and Technology, Harbin Institute of Technology (HIT) Harbin 150080 China

Key Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University Harbin 150080 China

RSC Adv. 2018 May 25;8(35):19362-19368. doi: 10.1039/c8ra01146j.

This paper reports the synthesis of a β-NaYF:Yb/Tm phosphor by a thermal decomposition method and focuses on the fabrication of microfibers by the co-doping of nanocrystals with PMMA solution a facile drawing method. The structural characteristics of the nanocrystals are studied by XRD and TEM techniques. Meanwhile, the optical properties of the microfibers are probed by wave guiding performance and upconversion spectroscopy. With the excitation of a 980 nm laser source, the microfiber presented blue upconversion emission of Tm ions. The fluorescence intensity ratio (FIR) method is utilized for the non-thermally coupling transition (D → F (452 nm) and G → H (476 nm)) levels to carry out the optical thermometry. The maximum sensitivity is recorded at 298 K and is 0.00157 K. The results suggest that the microfibers have potential applications in thermometry with high sensitivity.

本文报道了通过热分解法合成β-NaYF:Yb/Tm荧光粉，并着重介绍了通过将纳米晶体与PMMA溶液共掺杂采用简便的拉伸方法制备微纤维。通过XRD和TEM技术研究了纳米晶体的结构特征。同时，通过波导性能和上转换光谱探测了微纤维的光学性质。在980 nm激光源激发下，微纤维呈现出Tm离子的蓝色上转换发射。利用荧光强度比（FIR）方法对非热耦合跃迁（D→F（452 nm）和G→H（476 nm））能级进行光学测温。在298 K时记录到的最大灵敏度为0.00157 K。结果表明，微纤维在高灵敏度测温方面具有潜在应用。