Abstract Photoluminescence (PL) enhancement of rare earth ions is in high demand due to their crucial applications in optoelectronics devices and biomedical frequency up-convertors for endoscopy, which could be realized by a plasmonic field enhancement effect of metallic nanoparticles (NPs). In this work, both the PL emission and Raman scattering enhancement of Pr3+ ions in CaF2 crystal host have been observed for the first time by embedding silver NPs. By Ag+ ion implantation, Ag NPs (around 5 nm) have been encapsulated into the Pr:CaF2 matrix. Analysis of the difference between linear optical absorption and PL excitation spectra within the plasmon band, the mechanism of observed PL enhancement has been attributed to the local field enhancement induced by the plasmonic NPs. The classical energy transfer process nanoparticle-emitter was not present. The detailed analysis of the PL enhancement induced by unannealed and annealed Ag NPs is compared under the measurement of PL decay, showing the dominant mechanism of the increased absorption and radiative decay rate, respectively. This work shows an efficient method to enhance PL emission of rare earth ions in the crystal based on the embedded metallic NPs, which could be used to optimize the photonic sensors and light emitting devices.

中文翻译：

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嵌入银纳米粒子在 Pr:CaF2 晶体中等离子体诱导的光致发光和拉曼增强

摘要 稀土离子的光致发光 (PL) 增强由于其在光电器件和用于内窥镜检查的生物医学上变频器中的重要应用而具有很高的需求，这可以通过金属纳米粒子 (NPs) 的等离子体场增强效应来实现。在这项工作中，通过嵌入银纳米颗粒，首次观察到 CaF2 晶体基质中 Pr3+ 离子的 PL 发射和拉曼散射增强。通过 Ag+ 离子注入，Ag NP（约 5 nm）已被封装到 Pr:CaF2 基质中。分析等离子体带内线性光吸收和 PL 激发光谱之间的差异，观察到的 PL 增强机制归因于等离子体 NP 诱导的局部场增强。经典的能量转移过程纳米粒子发射器不存在。在 PL 衰减的测量下比较了由未退火和退火的 Ag NPs 引起的 PL 增强的详细分析，分别显示了增加吸收和辐射衰减率的主要机制。这项工作展示了一种基于嵌入的金属纳米颗粒增强晶体中稀土离子 PL 发射的有效方法，可用于优化光子传感器和发光器件。