Eu doped -PbF oxyfluoride glass ceramics (GCs) were synthesized via conventional melt-quenching method. The micro-morphology and luminescence properties of the fabricated GCs were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and photoluminescence (PL) spectra. A new temperature sensing mechanism based on fluorescence intensity ratio (FIR) between D → F (1, 2, 3, 4) and D → F transitions of Eu ion was proposed. Such new mechanism is due to strong thermal coupling of F (J = 0, 1, 2, 3, 4) states because of their small energy gap. With the increase of temperature, more and more population reaches high states F (J = 1, 2, 3, 4) from F state through thermalization process leading to different temperature-dependent transitions of D → F (J = 0, 1, 2, 3, 4). Furthermore, lattice distortion around Eu ions caused by co-doped K ions resulting in distinct enhancement of emission of Eu ion and violent splitting of F (J = 2, 3, 4) states. Meanwhile, narrowing of energy gap between F (J = 0, 1, 2, 3, 4) states resulting from the violent splitting of F (J = 2, 3, 4) states facilitated thermalization process between F (J = 0, 1, 2, 3, 4) states and then enhanced sensitivity of temperature measurement was obtained. We believe that this preliminary study will provide an important advance in exploring other innovative optical thermometry.

中文翻译：

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通过电荷补偿和局部晶格对称性破缺增强 Eu3+ 掺杂 β-PbF2 氟玻璃陶瓷的发光性能，用于新型光学测温

采用传统的熔融淬火方法合成了Eu掺杂-PbF氟氧化物玻璃陶瓷（GCs）。通过 X 射线衍射 (XRD)、高分辨率透射电子显微镜 (HRTEM) 和光致发光 (PL) 光谱对所制备的 GC 的微观形貌和发光性能进行了表征。提出了一种基于Eu离子D→F(1,2,3,4)和D→F跃迁之间荧光强度比(FIR)的新温度传感机制。这种新机制是由于 F (J = 0, 1, 2, 3, 4) 态的强热耦合，因为它们的能隙很小。随着温度的升高，越来越多的粒子通过热化过程从 F 态达到高态 F (J = 1, 2, 3, 4)，导致 D → F (J = 0, 1, 2) 的不同温度依赖性转变、 3、 4)。此外，共掺杂K离子引起Eu离子周围的晶格畸变，导致Eu离子的发射明显增强，并导致F（J = 2,3,4）态的剧烈分裂。同时，由于F(J=2,3,4)态的剧烈分裂导致F(J=0,1,2,3,4)态之间的能隙变窄，促进了F(J=0,1)态之间的热化过程。 , 2, 3, 4) 状态，然后获得增强的温度测量灵敏度。我们相信，这项初步研究将为探索其他创新光学测温技术提供重要进展。