Luminescent nanothermometers have shown competitive superiority for contactless and noninvasive temperature probing especially at the nanoscale. Herein, we report the inherently Eu²⁺/Eu³⁺ codoped Sc₂O₃ nanoparticles synthesized via a one‐step and controllable thermolysis reaction where Eu³⁺ is in‐situ reduced to Eu²⁺ by oleylamine. The stable luminescence emission of Eu³⁺ as internal standard and the sensitive response of Eu²⁺ emission to temperature as probe comprise a perfect ratiometric nanothermometer with wide‐range temperature probing (77–267 K), high repeatability (>99.94%), and high relative sensitivity (3.06% K^–1 at 267 K). The in situ reduction of Eu³⁺ to Eu²⁺ ensures both uniform distribution in the crystal lattice and simultaneous response upon light excitation of Eu²⁺/Eu³⁺. To widen this concept, Tb³⁺ is codoped as additional internal reference for tunable temperature probing range.

中文翻译：

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固有的Eu2 + / Eu3 +共掺杂Sc2O3纳米颗粒作为高性能纳米温度计

发光纳米温度计已显示出对非接触式和非侵入式温度探测的竞争优势，尤其是在纳米尺度上。本文中，我们报告了通过一步可控的热解反应合成的固有的Eu ²⁺ / Eu ³⁺共掺杂的Sc ₂ O ₃纳米粒子，其中油酸胺将Eu ³⁺原位还原为Eu ²⁺。稳定的Eu ³⁺发光发射作为内标，以及Eu ²⁺发射对温度的敏感响应作为探针，是一种完美的比例式纳米温度计，具有宽范围的温度探测（77–267 K），高重复性（> 99.94％），相对灵敏度高（3.06％K^– 267 K时为^–1）。Eu ³⁺原位还原为Eu ²⁺既确保了晶格中的均匀分布，又确保了Eu ²⁺ / Eu ^3+的光激发时的同时响应。为了扩展这个概念，将Tb ³⁺共掺杂为可调温度探测范围的附加内部基准。