In this work, the application of near infrared (NIR)‐emitting NaYbF₄:1%Tm³⁺@NaLuF₄:30%Nd³⁺ core–shell nanoparticles is reported for noninvasive probing and monitoring the temperature during photopolymerization of dental materials. When excited at 808 nm, the synthesized nanoparticles emit NIR photoluminescence (PL) with two distinctive peaks at 865 and 980 nm which correspond to radiative transitions from the doped Nd³⁺ and Yb³⁺ ions, respectively. Luminescence intensity ratio between these two bands is found to vary with temperature due to temperature‐dependent electronic excitation energy transfer between Nd³⁺ and Yb³⁺ ions at the core/shell interface. This finding allows luminescence ratiometric evaluation of the in situ temperature during photopolymerization of resin cement (doped with nanoparticles) in a veneer placement procedure. In addition, the NIR emission also enables PL imaging of the distribution of the adhesive under the veneer. The results highlight that rare‐earth ions–doped nanoparticles with both excitation and emission in the NIR spectral range are advantageous for both PL‐based nanothermometry and imaging due to the reduced attenuation of NIR light by dental ceramics.

中文翻译：

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使用在近红外区域发射的Nd3 +，Yb3 +掺杂的纳米粒子对牙科材料进行无创温度测量

在这项工作中，据报道应用近红外（NIR）发射的NaYbF ₄：1％Tm ³⁺ @NaLuF ₄：30％Nd ³⁺核壳纳米粒子可用于无创探测和监测牙科材料光聚合过程中的温度。当在808 nm激发时，合成的纳米粒子会发射NIR光致发光（PL），在865和980 nm处有两个明显的峰，分别对应于掺杂Nd ³⁺和Yb ³⁺离子的辐射跃迁。由于Nd ³⁺和Yb ³⁺之间依赖温度的电子激发能转移，发现这两个谱带之间的发光强度比随温度而变化。核/壳界面处的离子。该发现允许在单板放置程序中的树脂水泥（掺有纳米粒子）的光聚合过程中以发光比例评估原位温度。此外，NIR发射还可以对胶合板下胶粘剂的分布进行PL成像。结果表明，稀土离子掺杂的纳米粒子在NIR光谱范围内具有激发和发射特性，由于牙科陶瓷减少了NIR光的衰减，因此既有利于PL纳米测温，又有利于成像。