The role of an inert shell in improving energy utilization in lanthanide-doped upconversion nanoparticles
The role of an inert shell in improving energy utilization in lanthanide-doped upconversion nanoparticles
复制标题
惰性壳在提高镧系元素掺杂上转换纳米颗粒能量利用率中的作用
作者：
Wang Yu
惰性壳层包覆被认为是增强镧系元素掺杂上转换纳米粒子发光和提高发光量子产率的有效途径。在这项工作中，惰性壳层的光子能量收集和能量转移行为的作用进行了仔细研究。我们的实验结果表明，由于壳层的有效能量捕获，在芯层中的Yb 3+离子之间形成了能量聚集效应。这种效应降低了总吸收并增强了上转换发射，特别是来自镧系元素发射体的较高水平的发射。此外，在我们的合成过程中可以控制的惰性壳的形态被认为是形成能量簇的关键。
Coating with an inert shell is considered an efficient approach for enhancing the emission and improving the luminescence quantum yield of lanthanide-doped upconversion nanoparticles. In this work, the role of an inert shell in the photon energy collection and energy transfer behavior is carefully studied. Our experimental results indicate that, owing to the valid energy trapping by the shell, an energy clustering effect is formed among the Yb3+ ions in the core. Such an effect reduces the total absorption and enhances the upconversion emission, especially the emission from the higher lying level of lanthanide emitters. Moreover, the morphology of the inert shell, which could be controlled during our synthesis, is deemed to be critical to the formation of energy clustering.